Antebrachial Muscles

Question 1

FLEXOR CARPI RADIALIS

Answer 1

origin: medial epicondyle of humerus
insertion: base of 2nd metacarpal
innervation: median nerve (6-7)
action: wrist- flexion and abduction of hand

Question 2

PALMARIS LONGUS

Answer 2

origin: medial epicondyle of humerus
insertion: palmar aponeurosis
innervation: median nerve (7-8)
action: elbow- weak flexion; wrist- flexion tightens palmar aponeurosis

Question 3

FLEXOR CARPI ULNARIS

Answer 3

origin: humeral head- medial epicondyle; ulnar head- olecranon
insertion: pisiform; hook of hamate; base of 5th metacarpal
innervation: ulnar n (7-1)
action: wrist- flexion and adduction of hand

Question 4

FLEXOR DIGITORUM SUPERFICIALIS

Answer 4

origin: humeral- ulnar head; medial epicondyle of humerus; radial head- upper half of anterior border of radius
insertion: sides of middle phalanges of 2-5 digits
innervation: median nerve (8-1)
action: elbow- weak flexor; wrist- MCP, PIP joints of 2nd to 5th digits, flexion

Question 5

FLEXOR DIGITORUM PROFUNDUS

Answer 5

origin: ulna and interosseous membrane
insertion: distal phalanges 2-5 digits (palmar surface)
innervation: median (8-1) and ulnar (8-1)
action: wrist, MCP, PIP and DIP of 2-5 digits, flexion

Question 6

FLEXOR POLLICIS LONGUS

Answer 6

origin: radius and adjacent interosseous membrane
insertion: distal phalanx of thumb (palmar surface)
innervation: median (7-8)
action: wrist- flexion, abduction, of hand; carpometacarpal of thumb- flexion MCP and IP of thumb- flexion

Question 7

PRONATOR QUADRATUS

Answer 7

origin: distal quarter of ulna
insertion: distal quarter of radius
innervation: median nerve (7-8)
action: hand- pronation; distal radioulnar joint- stabilization

Question 8

PRONATOR TERES

Answer 8

origin: humeral head- medial epicondyle; ulnar head- coranoid process
insertion: lateral radius
innervation: median n (6-7)
action: elbow- weak flexor; forearm- pronation