Those in the same compartment will have the same action. It causes flexion of the interphalangeal joint (IP joint) of the thumb, as well as flexion at the metacarpophalangeal joint (MP joint). Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. The extrinsic muscles move the whole tongue in different directions, whereas the intrinsic muscles allow the tongue to change its shape (such as, curling the tongue in a loop or flattening it). Each of these muscles has a name; for example, again, the biceps brachii and now the triceps brachii, responsible for both forearm flexion and forearm extension, respectively. This muscle chart eBook covers the following regions: This eBook contains high-quality illustrations and validated information about each muscle. This is logical because this muscle inserts broadly at an angle across much of the back of the head, so it attaches to both lateral structures (the mastoid processes) and medial structures (the occipital bone). Long head originates from the Supraglenoid cavity. The insertion is usually distal,. The muscle causes flexion of the wrist and ulnar deviation when its acts with extensor carpi ulnaris. An easy way to remember this little fact is to keep in mind the following mnemonic. The action makes sense when you consider the muscle's points of attachment. The posterior muscles of the neck are primarily concerned with head movements, like extension. Its action is elevation of the scapula as well as superior rotation of the scapula. Muscle Origin, Insertion, and Action - 1 by AshPopRox 4,509 plays 11 questions ~30 sec English 11p More 6 too few (you: not rated) Tries Unlimited [?] The origin is the attachment site that doesn't move during contraction, while the insertion is the attachment site that does move when the muscle contracts. It is best studied broken down into its components: regions, joints, muscles, nerves, and blood vessels. Working Scholars Bringing Tuition-Free College to the Community, Differentiate between origin and insertion, as well as proximal and distal, Explain how agonists, antagonists and synergists work together to control muscle movement. It is a powerful superficial muscle of the shoulder. Phew. It is innervated by the median nerve a branch of the lateral and medial cord of the brachial plexus. Some axial muscles cross over to the appendicular skeleton. Pronator teres muscle is the larger of the pronator muscles and has two heads. It has an essential role in initiating the first 15 degrees of abduction (move away from the body). It has three heads: long, lateral, and medial. It is the chief medial rotator of the shoulder and modulates the movement of the deltoid. Muscles of the Upper Limb Pectoralis minor ORIGIN: anterior surface of ribs 3 - 5 ACTION INSERTION: coracoid process (scapula) Muscles Stabilizing Pectoral Girdle INNERVATION: pectoral nerves: protracts / depresses scapula (Anterior view) Serratus anterior ORIGIN: ribs 1 - 8 INSERTION: ACTION medial border of scapula stabilizes / depresses It inserts into the medial aspect of the 5th metacarpal. Due to these attachments, contraction and muscle shortening of the biceps flexes the forearm. Why not cut your time in half by studying with our upper limb muscle anatomy chart? Pectoralis major muscle :This is a superficial, large, fan shaped muscle that makes up the bulk of the pectoral (chest) region. lessons in math, English, science, history, and more. It is innervated by the musculocutaneous nerve. As the muscles pass anteriorly to the MP joints and insert they cause flexion of the MP joint and extension of the IP joints. Let's take a look at forearm flexion and identify the roles of the different muscles involved. Muscles of the Posterior Neck and the Back. It has numerous muscles and has a complex range of movements. It is innervated by the deep branch of the radial nerve. It is innervated by the anterior interosseous branch. It is innervated by the posterior scapular nerve. Interossei:These are grouped into four dorsal and threepalmar interossei and are part of the midpalmar group. Winged scapula is caused by an injury to the long thoracic nerve. Most skeletal muscle is attached to bone on its ends by way of what we call tendons. The muscle has a frontal belly and an occipital belly (near the occipital bone on the posterior part of the skull). It inserts into the lateral surfaces of the middle phalanges of the 2nd to 5th digits. I would definitely recommend Study.com to my colleagues. Last Played February 22, 2022 - 12:00 am There is a printable worksheet available for download here so you can take the quiz with pen and paper. EKG Rhythms | ECG Heart Rhythms Explained - Comprehensive NCLEX Review, Simple Anatomy Quiz Most Nurses Get WRONG! The muscles discussed below are essential to everyday life and advanced movements such as writing. It is innervated by the medial (C8-T1) and lateral (C5-C7) pectoral nerves. The tendon of the muscle passes in its own tunnel to enter the palm and it inserts onto the base of the 1st distal phalanx. The muscle inserts onto the anterior lateral surface of the body of the radius. Tongue muscles can be extrinsic or intrinsic. The third group, the spinalis group, comprises the spinalis capitis (head region), the spinalis cervicis (cervical region), and the spinalis thoracis (thoracic region). For origins and insertions, I learned the exceptions in each compartment/the ones that stick out. Lumbricals:These are worm like muscles that originate from the tendons of the flexor digitorum profundus. The clavicular head arises from the medial two thirds of the inferior surface of the clavicle. The erector spinae has three subgroups. insertion: ribs, A big sheet We will study these muscles in depth. This is where the rotator cuff muscles become inflamed and impinged as they pass through the subacromial space. Memorizethe superficial forearm flexors usingthe followingmnemonic! Take advantage of the following mnemonic to make your life a little easier! For this reason, the anatomy of the upper limb from the aspect of muscles will be reviewed topographically. It inserts onto the deltoid tuberosity, which is a roughened elevated patch found on the lateral surface of the humerus. As a member, you'll also get unlimited access to over 88,000 This system reflects the bones of the skeleton system, which are also arranged in this manner. Because the muscles insert in the skin rather than on bone, when they contract, the skin moves to create facial expression (Figure 11.4.1). It inserts onto the crest of greater tubercle of the humerus. Here I discuss an alternative way to learn muscles and their origin(s), insertion(s), and action(s).Key Takeaways. These include the digastric muscle, which has anterior and posterior bellies that work to elevate the hyoid bone and larynx when one swallows; it also depresses the mandible. Origin: from the ischium of the pelvis Insertion: the tibia of the lower leg. The semispinalis muscles include the semispinalis capitis, the semispinalis cervicis, and the semispinalis thoracis. The problem? Muscles are either axial muscles or appendicular. The Chemical Level of Organization, Chapter 3. The pectoral girdle, or shoulder girdle, consists of the lateral ends of the clavicle and scapula, along . These muscles can extend the head, laterally flex it, and rotate it (Figure 11.4.8). In anatomical terminology, chewing is called mastication. Commonly referred to as impingement syndrome. It pronates the radius and is innervated by the anterior interosseous branch of the median nerve. The Cardiovascular System: The Heart, Chapter 20. copyright 2003-2023 Study.com. The damaged nerve causes a weakened serratus anterior, leading to the scapula not being pulled down and in during circumduction. John has taught college science courses face-to-face and online since 1994 and has a doctorate in physiology. Mnemonics to remember bones Triceps Muscle Brachii Origin & Insertion | Where is the Tricep? Both of these muscles are innervated by the anterior interosseous branch. The muscle then descends inferiorly to insert into the radial tuberosity of the radius as well as help create the bicipital aponeurosis, an expansion that inserts into the deep fascia of the forearm and onto the ulna. In our cheat sheets, you'll find the origin (s) and insertion (s) of every muscle. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. Flashcard Maker: sean bennet. Tap the Skeletal System Icon, and press the Plus button until you come to the Origin and Insertion layer (the fourth layers of the system). By accessing any content on this site or its related media channels, you agree never to hold us liable for damages, harm, loss, or misinformation. Brachioradialis muscle:This muscle lies between the flexor and extensor compartments of the forearm. The styloglossus originates on the styloid process of the temporal bone, and allows upward and backward motion. Muscle: Abductor pollicis longus - Origin: - Posterior surfaces of radius and ulna - Interosseous membrane - Insertion: Base of 1st metacarpal - Action: - Radial deviation of wrist - Abduction of thumb at CMC joint - Nerve Supply: Deep branch of radial nerve. | 15 It is innervated by the C3 & C4 and the accessory nerve (cranial nerve 11 = CN11). 1. It commonly occurs following a fall onto an outstretched hand (FOSH). This muscle also modulates the movement of the deltoid like the other rotator cuff muscles. I highly recommend you use this site! It passes anteriorly and around the thoracic cage as if wrapping. The upper limb(upper extremity) is truly a complex part of human anatomy. Insertion: Crest of lesser tubercle of humerus Action: Extends, adducts, and medially rotates arm (spirals underarm to front . The shoulder is most unstable in extension and external rotation. It functions as a stabilizer of the scapula, acts as a protractor when reaching forward or pushing, and aids in rotation of scapula. It acts to extend the pinky as well as the wrist. Get unlimited access to over 88,000 lessons. The splenius group includes the splenius capitis and the splenius cervicis. The muscles of the back and neck that move the vertebral column are complex, overlapping, and can be divided into five groups. F lexor digitorum profundus muscle:It rises from the anterior proximal surface of the ulna and adjacent interosseous membrane and deep fascia of the forearm. Origin: Inferior angle of scapula. Click to Rate "Hated It" . Mnemonic for Pectoral Muscles Origin Insertion Function Mnemonics for Facial Muscleshttps://youtu.be/ulMHYpvoRbsMnemonics for Tongue Muscle. It also has a role in stabilizing the humerus and part of the rotator cuff of four muscles. succeed. Test your knowledge on the muscles of the arm right away using our handy round-up of quizzes, diagrams and free worksheets. Raise your eyebrows as if you were surprised and lower your eyebrows as if you were frowning. It is innervated by the musculocutaneous nerve, a branch of the lateral cord of the brachial plexus. Levator scapulae muscle:This is a deep small muscle that inserts onto the superior angle and superior medial scapular border. Kenhub. 3 in extensor compartment of arm: 3 heads of triceps (long, medial, lateral), 3 thenar muscles: abductor pollicis brevis, flexor pollicis brevis, opponens pollicis (+adductor pollicis), 3 hypothenar muscles: abductor digiti minimi, flexor digiti minimi, opponens digiti minmi (+palmaris brevis), 3 metacarpal muscles: dorsal interossei, palmar interossei, lumbricals, 3 abductors of digits: dorsal interossei, abductor pollicis brevis, abductor digiti minimi, Flexor carpi radialis muscle (cross-sectional view) -National Library of Medicine, Superficial head of flexor pollicis brevis muscle (ventral view) -Yousun Koh, Lumbrical muscles of the hand (ventral view) -Yousun Koh. Action: Extends thigh, flexes leg, Wider than semmitendonosis Suprahyoid muscles are superior to it, and the infrahyoid muscles are located inferiorly. Insertion inferior border of 12th rib and iliolumbar ligament and ((transverse process of L1-L4)) Facial muscles are different in that they create facial movements and expressions by pulling on the skinno bone movements are involved. Agonists, or prime movers, are responsible for the bulk of the action. Reading time: about 1 hour. It is innervated by spinal nerves C3-C4 and C5 via the posterior (dorsal) scapular nerve. Conversely, you can say the elbow is proximal to the wrist. They'll teach you everything you need to know about attachments, innervations and functions. This eBook contains high-quality illustrations and validated information about each muscle. A. Muscles of the Head and Neck. Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. It may seem strange that it is included in the anatomy of the upper limb. The geniohyoid depresses the mandible in addition to raising and pulling the hyoid bone anteriorly. The lower fibersare responsible forelevation and depression. Bone Tissue and the Skeletal System, Chapter 12. origin: tip of the coracoid process The scapula has no direct bony attachments to the thorax, so it is held in place and stabilized through muscular attachment. Muscle origins and insertions dictate the type of movement that occurs when a muscle contracts. Its like a teacher waved a magic wand and did the work for me. PAD DAB ('Use your hand to dab with a pad'). It arises from the anterior surface of the radius and adjacent interosseous membrane. action: elevates scapula, The posterior hamstring muscle group - action: protraction of scapula, muscle that allows you to shrug your shoulders or extend your head A FOSH may fracture the bone. They also contribute to deep inhalation. The neurovascular bundle (intercostal nerve, artery and vein) will separate these two muscles. It is innervated by the posterior interosseous branch. They work on the hyoid bone, with the suprahyoid muscles pulling up and the infrahyoid muscles pulling down. This is a fracture of the distal third of the radial shaft with dislocation of the distal radioulnar joint. The iliocostalis group includes the iliocostalis cervicis, associated with the cervical region; the iliocostalis thoracis, associated with the thoracic region; and the iliocostalis lumborum, associated with the lumbar region. Conventionally, a muscle origin describes the attachment of a muscle on the more stable bone. 2. The forearm is the region between the elbow and thewrist and is composed of an extensor and flexor compartment. Explain the difference between axial and appendicular muscles. The radial two lumbricals are innervated by the median nerve and the ulnar two are innervated by the ulnar nerve. Copyright Grounded on academic literature and research, validated by experts, and trusted by more than 2 million users. The strap-like infrahyoid muscles generally depress the hyoid bone and control the position of the larynx. However, the anatomist knows that the arm or the brachium is purely the region between the shoulder joint and elbow. This muscle song will help you learn the major muscles of the human body. Additional muscles of facial expression are presented in Figure 11.4.2. The muscles acts to flex the proximal IP joints as it primary function. These muscles are located inside the eye socket and cannot be seen on any part of the visible eyeball (Figure 11.4.3 and Table 11.3). However, the scapula is integral to the movement of the shoulder via the rotator cuffand additional muscles. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. The origin is the fixed attachment, while the insertion moves with contraction. The layman will refer to the entire upper limb as the arm. It arises from the trapezium and transverse carpal ligament. With these movements, you can feel the action of the corrugator supercilli. The actions and innervation are the same as the rhomboid major. The movements would be used in bowling or swing your arms while walking. All other trademarks and copyrights are the property of their respective owners. There are two main ones, so lets break em in half. The tendon is kept close to the bones by a series of flexor tendon sheaths, which lubricate the tendon and prevent bowstringing (excessive loss of proximal pulley). When they contract bilaterally, the head flexes or extends. A rotator cuff tear presents with general pain with overhead activities and may present with night pain. L: lateral two lumbricals. What are you waiting for? It divides and allows the tendon of flexor digitorum profundus to pass through at Campers chiasm (tendon split). Its supinating effect are maximal when the elbow is extended. The muscles of the anterior neck are arranged to facilitate swallowing and speech. A synergist is a muscle that enhances the action of the agonist. View Origin and Insertion points as a layer map Origin and Insertion points are available as a layer of the Skeletal System, which show a map of all attachment points across the full skeleton. The muscles of the anterior neck facilitate swallowing and speech, stabilize the hyoid bone and position the larynx. The muscle can be divided into three sets of fibers: upper, middle, and lower. Term. It has a long head and a short head. Thenar eminence:It consists of three muscle: flexor pollicis brevis, abductor pollicis brevis, and the opponens pollicis. It inserts onto the radial surface of the 1st proximal phalanx. These are unique muscles which originate from flexor tendon and insert into extensor tendon and act as guy ropes to correct tension between two opposing forces to maintain balance.. The nerve supply comes from the upper and lower subscapular. The muscles of facial expression originate from the surface of the skull or the fascia (connective tissue) of the face. Muscle: Extensor pollicis brevis. The muscle origin often describes the more proximal attachment point of the muscle, while the muscle insertion point refers to the distal attachment. It acts as an abductor of the shoulder, and inserts onto the superior facet of the greater tubercle of the humerus. Flexor pollicis longus muscle:This muscle is found superficially within the deep layer. Bony Landmarks Types & Identification | What are Femur Landmarks? Additionally, these muscles switch roles with opposite movements. Muscular contraction produces an action, or a movement of the appendage. The Nervous System and Nervous Tissue, Chapter 13. A rule of thumb is that any muscle tendon that crosses a joint will act on that joint. The erector spinae comprises the iliocostalis (laterally placed) group, the longissimus (intermediately placed) group, and the spinalis (medially placed) group. The muscles of the neck are categorized according to their position relative to the hyoid bone (Figure 11.4.7). This muscle divides the neck into anterior and posterior triangles when viewed from the side (Figure 11.4.8). Latissimus dorsi muscle :This is a large, fan shaped superficial muscle which has a large area of origin. Muscle memory is a form of procedural memory that involves consolidating a specific motor task into memory through repetition, which has been used synonymously with motor learning. The human body has over 500 muscles responsible for all types of movement. and grab your free ultimate anatomy study guide! Supinator muscle:It is a small muscle that arises from the lateral epicondyle of the humerus, the supinator crest of the ulna, as well as the annular and radial collateral ligaments that support the radius against the ulna. The two bellies are connected by a broad tendon called the epicranial aponeurosis, or galea aponeurosis (galea = apple). Don't forget to quiz yourself on the forearm flexors and extensors to consolidate your knowledge! It acts to flex the elbow. This muscle is considered an accessory muscle of respiration. MUSCLE NAME ORIGIN INSERTION ACTION NOTES MUSCLES OF THE ANTERIOR AND LATERAL ABDOMINAL WALL Rectus abdominis External oblique Internal oblique Transversus abdominis Internal surfaces of costal cartilages of ribs 7-12 . Extrinsic tongue muscles insert into the tongue from outside origins, and the intrinsic tongue muscles insert into the tongue from origins within it. Finally, synergist muscles enhance the action of the agonist. Due to its course it has a "serrated" or "saw-toothed" appearance. Themedial pterygoid and lateral pterygoid muscles provide assistance in chewing and moving food within the mouth by moving the mandible laterally and medially to grind food between the molars. Molly Smith DipCNM, mBANT Bsc Functional Anatomy and Biomechanics. Inferior dislocations are the least common and make the upper limb appears as if you are holding your upper limb upwards. Injection Gone Wrong: Can You Spot The Mistakes? Do Humans Have an Open or Closed Circulatory System? In summary, skeletal muscles are attached to bones on each end by tendons. Teres Major. Many muscles are attached to bones at either end via tendons. The upper fibers act to extend the neck, elevate, and upwardly rotate. Insertion: Proximal, medial tibia (inferior to medial condyle) All the intrinsic muscles of hand are supplied by the deep . The omohyoid muscle, which has superior and inferior bellies, depresses the hyoid bone in conjunction with the sternohyoid and thyrohyoid muscles. Shahab Shahid MBBS Insertion: Medial proximal condyle of tibia Action: Extends thigh, flexes leg, Origin: Lateral condyle and proximal tibia Insertion: First metatarsal and first cuneiform Action: Dorsiflexes and inverts foot, Origin: Condyles of femur Insertion: Calcaneus by calcaneal tendon Action: Flexes leg, plantar flexes foot, Origin:Posterior, proximal tibia and fibula Insertion: Calcaneus by calcaneal tendon Action: Plantar flexes foot, Origin: Head and shaft of fibula, lateral condyle of tibia Insertion: First metatarsal, first cuneiform Action: Plantar flexes and everts foot, Origin: Lateral COndyle of tibia, shaft of fibula Insertion: Middle of distal phalanges of second through fifth digits Action: Extends toes, dorsiflexes foot, Origin: Inferior border of a rib Insertion: Superior border of rib below Action: Elevates ribs (increases volume in thorax), Origin: Inferior border of a rib Insertion: Superior border of rib below Action: Depresses ribs (decreases volume in thorax), Origin: Posterior occipital bone, ligamentum nuchae, C7-T12 Insertion: Clavicle, Acromion process, and spine of scapula Action: Extends and abducts head, rotates and adducts scapula, fixes scapula, Origin: Spines of T2-5 Insertion: Lower one-third of vertebral border of scapula Action: retraction of scapula, Origin: Ligamentum nuchae, Spines C7-T1 Insertion: Vertebral border of scapula at scapular spine Action: retraction of scapula, Origin: Galea aponeurotica Insertion: Skin superior to orbit Action: Raises eyebrows, draws scalp anteriorly, Origin: Fascia of facial muscles near mouth Insertion: Skin of lips Action: Closes lips, Origin: Frontal and maxilla on medial margin of orbit Insertion: Skin of eyelid Action: Closes eyelid, Origin: Zygomatic arch Insertion: Angle and ramus of mandible Action: Closes mandible, Origin: Temporal fossa Insertion: coronoid process and ramus of mandible Action: Closes mandible, Origin: Sternum, clavicle Insertion: Mastoid process of temporal Action: Abducts, rotates, and flexes head, Origin: Ribs 1-8 Insertion: Vertebral border and inferior angle of scapula Action: Abducts scapula (moves scapula away from spinal column), Origin: Bottom of rib cage, Crest of pubis, symphysis pubis Insertion: xiphoid process, Origin: Ribs 5-12 Insertion: Linea alba, iliac crest, pubis Action: Compresses abdominal wall, laterally rotates trunk, Origin: Inguinal ligament, iliac crest Insertion: Linea alba, ribs 10-12 Action: Compresses abdominal wall, laterally rotates trunk, Origin: the inner surface of the 7th to 12th costal cartilages, the thoracolumbar fascia, the iliac crest horizontally, and the inguinal ligament Insertion: linea alba Action: support for the abdominal wall, directly on top of the sciatic nerve 2023 All rights reserved. We will use examples to describe how the origin and insertion affect the action of a skeletal muscle. The triceps is the antagonist, and its action opposes that of the agonist. By the end of this section, you will be able to: Identify the following muscles and give their origins, insertions, actions and innervations: The skeletal muscles are divided into axial (muscles of the trunk and head) and appendicular (muscles of the arms and legs) categories. This website helped me pass! The common flexor origin is the medial epicondyle. It inserts into the 5th proximal phalanx (pinky finger). The Lymphatic and Immune System, Chapter 26. It is available for free. The Peripheral Nervous System, Chapter 18. A: abductor pollicis brevis. The muscle also forms the medial border of the cubital fossa. Each of these actions can be described in one of two ways. Our opposable thumb is essential to our advancement as a species. During that particular movement, individual muscles will play different roles depending on their origin and insertion. Although the tongue is obviously important for tasting food, it is also necessary for mastication, deglutition (swallowing), and speech (Figure 11.4.5 and Figure 11.4.6). There are numerous muscles in this compartment. It inserts onto the medial border of the scapula just superior to the rhomboid major. The major muscle that laterally flexes and rotates the head is the sternocleidomastoid. If you have ever been to a doctor who held up a finger and asked you to follow it up, down, and to both sides, he or she is checking to make sure your eye muscles are acting in a coordinated pattern. origin: along spinus process of vertebrae and occipital bone Flexion, extension, abduction, adduction, rotation whether youre a doctor, physiotherapist or yoga teacher, knowing the functions of a given muscle is very important. It allows for powerful elbow extension (such as doing a pushup). Registered Nurse, Free Care Plans, Free NCLEX Review, Nurse Salary, and much more. Most skeletal muscles create movement by actions on the skeleton. The abductor digiti minimi arises from the pisiform, pisohamate ligament, and flexor retinaculum. The genioglossus (genio = chin) originates on the mandible and allows the tongue to move downward and forward. In addition, both muscles working together are the flexors of the head. It is innervated by the posterior interosseous branch. It passes laterally to insert onto the lesser tubercle of the humerus. The segmental muscles include the interspinales and intertransversarii. These muscles bring together the spinous and transverse processes of each consecutive vertebra. The nerve supply arises from the suprascapular nerve (upper and lower), which arises from the unification of the anterior rami of spinal nerves C5 and C6(C = cervical). This muscle also prevents the humeral head from moving too far upwards while the deltoidis in action, as do all the rotator cuff muscles. The latissimus dorsi is a large back muscle responsible for the bulk of adduction of the arm (pulling the arm to the sides of . Some of the axial muscles may seem to blur the boundaries because they cross over to the appendicular skeleton. Palmaris longus muscle: This muscle can be absent in some of the population. As a result it acts as a flexor, extensor, and abductor of the shoulder. Last reviewed: July 22, 2022 The medial head arises from the posterior surface of the humerus below the radial groove. Insertion: greater trochanter on the back of the femur In most cases, one end of the muscle is fixed in its position, while the other end moves during contraction. The distal phalanx therefore lies in permanent flexion, and has the appearance of a mallet. The triceps brachii becomes the agonist - while the biceps brachii is the antagonist - when we extend our forearm. Take a look at the following two mnemonics! Kinesiological Analysis: Description & Major Components, Massage Therapy Scope of Practice | Overview, Purpose & Manipulation. It acts as an adductor, medial rotator, and flexor of the arm at the shoulder joint. This results in a restricted range of motion. By looking at all of the upper limbs components separately we can appreciate and compartmentalize the information, then later view the upper limb as a whole and understand how all of its parts work in unison. Gross Anatomy I. For . This can present as pain, weakness and loss of shoulder movement between 60 and 120 degrees of abduction. It is innervated by the axillary nerve. The rotator cuff is formed by four muscles, supraspinatus, infraspinatus, teres minor, and subscapularis. Action: Actions Alone(unilateral), lateral flexion of vertebral column; Together (bilateral), depression of thoracic rib cage, any of the three pairs of muscles on each side of the neck that are involved in moving the neck, and in breathing Like the trapezius, this muscle can be divided into three sets of fibers: anterior, lateral, and posterior. 31 Decks -. Join the nursing revolution. Hamstring Anatomy Mnemonics - Origin, Insertion, Innervation & Action No views Aug 11, 2022 0 Dislike Share Save Memorize Medical 125 subscribers Easy ways to learn and remember the.
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