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Antebrachium INT

Intrinsic muscles of the thoracic/pectoral limb antebrachium

QuestionAnswer
Extensor carpi radialis ORIGIN - later epicondylar crest of humerus INSERTIONS - proximal metacarpal II and III ACTION - extension of carpus, slight flexion of elbow FORM - long tendonous insertion POSITION - cranial surface of radius, medial to common digital extensor
Common digital extensor ORIGIN - lateral epicondyle humerus INSERTIONS - distal phalanges of digits II-V ACTION - extension of 4 principle digits POSITION - lateral to extensor carpi radialis, medial to lateral digital extensor
Lateral digital extensor ORIGIN - lateral epicondyle humerus INSERTIONS - main - proximal phalynx of digit V, lesser - distal phalanges digits III and IV ACTION - extension of digits III-V Position - lateral to common digital extensor
Extensor carpi ulnaris ORIGIN - lateral epicondyle humerus INSERTION - proximal metacarpal V ACTION - extension of carpus, weak lateral rotation POSITION - caudolateral side of ulna
Supinator ORIGIN - ulna collateral ligament and lateral epicondyle humerus INSERTION - proximal dorsal radius ACTION - supination of antibrachii POSITION - deep to common digital extensor and lateral digital extensor
Abductor digiti I pollicis longus ORIGIN - lateral surface of ulna interosseus membrane INSERTION - proximal medial end of metacarpal I ACTION - abduction and extension of digit I POSITION - lie in the lateral groove between radius and ulna
Extensor digiti I et II pollicus longus ORIGIN - dorsolateral border of ulna INSERTION - distal metacarpals II and III ACTION - extension of digits I and II, abduction of digit I POSITION - deep to extensor carpi ulnaris and digital extensors
Pronator teres ORIGIN - medical epicondyle humerus INSERTION - medial border of radius, as far as its middle (inserts distal to supinator) ACTION - pronates antebrachii, fixes elbow POSITION - deep to skin
Flexor carpi radialis ORIGIN - medial epicondyle humerus INSERTIONS - proximal metacarpals II and III ACTION - flexion of carpus
Superficial digital flexor ORIGIN - medial epicondyle humerus INSERTIONS - middle phalynx digits II - V ACTION - flexion of metacarpalphalengeal and proximal interphalangeal joints POSITION - deep to skin, mediocaudal to flexor carpi radialis
Flexor carpi ulnaris - ulnar head ORIGIN - ulnar head medial surface olecranon INSERTION - accessory carpal bone ACTION - flexion and abduction of forepaw FORM - flat, strap like POSITION - superficial and lateral to superficial digital flexor
Flexor carpi ulnaris - humeral head ORIGIN - medial epicondyle INSERTION - accessory carpal bone ACTION - flexion and abduction of forepaw POSITION - deep to superficial digital flexor
Deep digital flexor - radial head ORIGIN - medial proximal radius INSERTIONS - distal phalanges digits II-V, small insertion on digit I ACTION - flexion of phalanges and carpus FORM - smallest head of deep digital flexor
Deep digital flexor - humeral head ORIGIN - medical epicondyle humerus INSERTIONS - distal phalanges digits II-V, small insertion on digit I ACTION - flexion of phalanges and carpus FORM - largest head of deep digital flexor
Deep digital flexor - ulnar head ORIGIN - caudal proximal ulna and medial olecranon INSERTIONS - distal phalanges digits II-V, small insertion on digit I ACTION - flexion of phalanges and carpus
Pronator quadratus ORIGIN - interosseus membrane INSERTION - medial aspects of radius and ulna ACTION - pronation of forepaw POSITION - medial groove between radius and ulna
Interossi ORIGIN - proximal metacarpals II-V INSERTION - proximal end of 1st (proximal) phalanx ACTION - flexion of metacarpalphalengeal joint
Created by: tazza261
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