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A&P

Muscle AOIs

Muscle ActionOriginInsertion
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
Created by: daijagreen55
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