Forearm Muscles

Question 1

Palmaris Longus

Answer 1

O: common flexor tendon from medial epicondyle of humerus
I: flexor retinaculum and palmar aponeurosis
A: flexes band at wrist
N: median c7-8

Question 2

Flexor Capri radialis

Answer 2

O: common flexor tendon from medial epicondyle to humerus
I: anterior surfaces of bases of 2nd and 3rd metacarpals
A: flex and radially deviate hand at wrist
N: median c6-c7

Question 3

Flexor carpi ulnaris

Answer 3

O: by 2 heads from medial epicondyle of humerus of medial border of olecranon process of ulna
I: palmar surface of pisiform and hamate carpal bones and bases of 5th metacarpal
A: flex and ulnar deviate hand at wrist
N: ulnar c7c8

Question 4

Extensor capri radialis longus

Answer 4

Lower 1/3 lateral supracondykar Ridge, few fibers from lat epicondyle
I: posterior surface of base of second metacarpal
A: extends and radially deviates hand at wrist
N: radial c6,7

Question 5

Extensor digitorum

Answer 5

O: common extensor tendon from lateral epicondyle of humerus
I: 1 to each finger dorsal surface middle phalanx base of distal phalanx
A: extends phalanges at IP joints, cont. action extends metacarpophalangeal and carpometacarpal articulations. Extend wrist
N: posterior interosseous c7-8

Question 6

Extensor carpi radialis brevis

Answer 6

O: common extensor tendon from lateral epicondyle of humerus
I: posterior surface of base 3rd metacarpal
A: extension and radial deviation of hand at wrist
N: posterior interosseous c7-8

Question 7

Extensor carpi ulnaris

Answer 7

O: lateral epicondyle of humerus and middle 1/3 posterior Ridge of ulna
I: posterior surface of base of 5th metacarpal
A: extends and ulnarly deviates hand at wrist
N: posterior interosseous c7-8

Question 8

Flexor digitorum superficialis

Answer 8

O: humeroulnar is medial epicondyle of humerus by common flexor tenon, ulnar collateral ligament of elbow and coronoid process of ulna
Radial: oblique line of radius extending from radial tuberosity to insertion pronator teres
I: 2-5 sides of middle phalanx
A: flexes phalanx of each finger, flex prox phalanx at hand at wrist
N: medial c7-8 t1

Question 9

Flexor digitorum profundus

Answer 9

O: upper 3/4 anterior and medial surface of ulna, interroseuous membrane and deep fascia of forearm
I: palmar surface of distal phalanx after passing through each tendon of flexor digitorum superficialis
A: flexes distal phalanges of 4 fingers, assist in flexing matacarpophalangeal, carpometacarpal and wrist joints
N: median and ulnar to ring and little fingers c8t1