anterior compartment of forearm (+ brachialis) muscles OIA

Question 1

brachialis

Answer 1

O: distal 1/2 of anterior shaft of humerus
I: ulnar tuberosity and coronoid process of ulna
A: flexion of forearm @ elbow joint

Question 2

pronator teres

Answer 2

O: humeral head - medial epicondyle, ulnar head - medial surface of coronoid process
I: middle 1/3 of lateral radius
A: pronation of forearm @ RU joint, weak flexion of forearm @ elbow

Question 3

flexor carpi radialis

Answer 3

O: medial epicondyle
I: base of 2nd and 3rd metacarpals (anterior hand)
A: flexion, radial deviation of hand @ wrist, weak flexion of forearm @ elbow, weak pronation of forearm @ RU

Question 4

palmaris longus

Answer 4

O: medial epicondyle
I: palmar aponeurosis, flexor retinaculum
A: flexion of hand @ wrist, weak flexion of forearm @ elbow, weak pronation of forearm @ RU, weak radial and ulnar deviation of hand @ wrist

Question 5

flexor carpi ulnaris

Answer 5

O: medial epicondyle of humerus, medial margin of olecranon, proximal 2/3 of posterior ulna
I: pisiform, hook of hamate, base of 5th metacarpal (palmar hand)
A: flexion, ulnar deviation of hand @ wrist, weak flexion of forearm @elbow

Question 6

flexor digitorum superficialis

Answer 6

O: humeroulnar head - medial epicondyle and coronoid process, radial head - proximal 1/2 of anterior shaft of radius (distal to radial tuberosity)
I: anterior surface of middle phalanx of fingers 2-5 (4 tendons turn to 2 slips)
A: flexion of fingers 2-5 @ MCP and PIP joints, flexion of hand @ wrist, weak flexion of forearm @ wrist

Question 7

flexor digitorum profundus

Answer 7

O: proximal 1/2 of medial anterior ulna (distal to ulnar tuberosity) and interosseous membrane
I: anterior surface of fingers 2-5 (distal phalanges)
A: flexion of fingers 2-5 @ MCP, PIP, DIP. Flexion of hand @ wrist.

Question 8

flexor pollicis longus

Answer 8

O: anterior surface (distal half) of radius and interosseous membrane, medial epicondyle of humerus, coronoid process of ulna
I: anterior aspect of base of distal phalanx of thumb
A: flexion of thumb @ CMC, IP joints, flexion of hand @ wrist, weak flexion of forearm @ elbow, weak pronation of forearm @ RU

Question 9

pronator quadratus

Answer 9

O: anterior distal 1/4 of ulna
I: anterior distal 1/4 of radius
A: pronation of forearm @ RU