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A&P
Muscle AOIs
Muscle | Action | Origin | Insertion |
---|---|---|---|
pectoralis major | adduction, rotation, flexion, and extension of arm | medial clavicle, costal cartilages 1-6, sternum, and aponeurosis of external abdominal oblique | intertubercular sulcus of humerus |
latissimus dorsi | adduction, extension, and medial rotation of arm | sacral and lumbar spines, iliac crest, thoracolumbar fascia, lower 4 ribs, spinous processes of T6-12 vertebrae, and inferior angle of scapula | intertubercular sulcus of humerus |
deltoid | flexion, medial rotation, abduction, extension, and lateral rotation of arm | lateral 1/3 clavicle, acomion and spine of scapula | deltoid tuberosity of humerus |
trapezius | elevation, adduction, depression and superior rotation of scapula | superior nuchal line of occipital bone, spinous process of C7 and T1-12 vertebrae | lateral clavicle, spine and acromion of scapula |
pectoralis minor | stabilizes, abducts, and laterally rotates scapula | ribs 3-5 | coracoid process of scapula |
external oblique | rotation/flexion of trunk, compression of abdominal wall and viscera | ribs and costal cartilages 5-12 | linea alba, iliac crest |
internal oblique | rotation/flexion of trunk, compression of abdominal wall and viscera | inguinal ligament, iliac crest, thoracolumbar fascia | linea alba, costal cartilages 7-10 |
transverse abdominis | compression of abdominal wall and viscera | iliac crest, inguinal ligament, thoracolumbar fascia, costal cartilages 7-12 | pubis, linea alba, xiphoid process of sternum |
brachioradialis | flexion, pronation, and supination of the forearm | lateral distal shaft of humerus | styloid process of radius |
pronator teres | pronation of forearm | medial epicondyle of humerus, coronoid process of ulna | lateral mid-shaft of raidus |
flexor carpi radialis | flexion of wrist, abduction of hand | medial epicondyle of humerus | base of metacarpals II and III |
palmaris longus | flexion of wrist(weak), tense palmar aponeurosis | medial epicondyle of humerus | palmar aponeurosis |
flexor carpi ulnaris | flexion of wrist, adduction of hand | medial epicondyle of humerus, olecranon and posterior border of ulna | pisiform, hamate, base of metacarpal V |
extensor carpi radialis longus | extension of wrist, abduction of hand | lateral supracondylar ridge of humerus | base of metacarpal II |
extensor carpi radialis brevis | extension of wrist, abduction of hand | lateral epicondyle of humerus | base of metacarpal III |
extensor digitorum | extension of fingers 2-5, extension of wrist | lateral epicondyle of humerus | middle and distal phalanges of fingers 2-5 |
extensor carpi ulnaris | extension of wrist, adduction of hand | lateral epicondyle of humerus, posterior shaft of ulna | base of metacarpal V |
flexor pollicis longus | flexion of thumb | anterior mid-shaft of radius, interosseous membrane, coronoid process of ulna | distal phalanx of thumb |
flexor digitorum profundus | flexion of fingers 2-5, flexion of wrist and metacarpophalangeal joints | proximal anterior shaft of ulna, interosseous membrane | distal phalanges of fingers 2-5 |
abductor pollicis longus | extension and abduction of thumb | proximal posterior of radius and ulna, interosseous membrane | base of metacarpal I |
extensor pollicis longus | extension of thumb | posterior mid shaft of ulna, interosseous membrane | distal phalanx of thumb |
supinator | supination of forearm | posterior proximal shaft of ulna, lateral epicondyle of humerus | lateral proximal shaft of radius |
abductor pollicis brevis | abduction of thumb | scaphoid, trapezium, flexor retinaculum | lateral side of proximal phalanx of thumb |
flexor pollicis brevis | flexion of thumb | trapezium, trapezoid, capitate, flexor retinaculum | lateral side of proximal phalanx of thumb |
opponens pollicis | opposition of thumb | trapezium, flexor retinaculum | shaft of metacarpal I |
adductor pollicis | adductor of thumb | capitate, metacarpals II-III | proximal phalanx of thumb |
opponens digiti minimi | opposition of little finger | hamate, flexor retinaculum | shaft of metacarpal V |
lumbricals of the hand | flexion of fingers at metacarpophalangeal joints, extension of fingers at interphalangeal joints | tendons of flexor digitorum profundus | proximal phalanx of fingers 2-5 via extensor expansions of fingers 2-5 |
palmar interossei of the hand | adducts fingers 2-5, flexion of fingers 2-5 at metacarpophalangeal joint, extension of fingers 2-5 at interphalangeal joint | palmar surfaces of metacarpals II-V | extensor expansions of fingers 2-5, bases of proximal phalanges of fingers 2-5 |
dorsal interossei of the hand | abducts fingers 2-5, flexion of fingers 2-5 at metacarpophalangeal joints, extension of fingers 2-5 at interphalangeal joint | metacarpals I-V each attavhes to adjacent sides of 2 metacarpals | extensor expansions of fingers 2-4, proximal phalanges of fingers 2-4 at the bases |