Hand and Wrist Muscles

Question 1

Flexor carpi radialis

Answer 1

O- medial epicondyle of the humerus
I- base of second and third metacarpals
A- combined wrist flexion and radial deviation

Question 2

Extensor carpi ulnaris

Answer 2

O- lateral epicondyle of humerus
I- base of fifth metacarpal
A- combined wrist extension and ulnar deviation

Question 3

Extensor pollicis longus

Answer 3

O- posterior middle portions of ulna and interosseus membrane
I- base of distal phalanx of thumb
A- extends the CMC, MCP, and IP joints of the thumb

Question 4

Flexor digitorum superficialis

Answer 4

O- common flexor tendon on the medial epicondyle, coronoid process, and radius
I- sides of the middle phalanx of the 4 fingers
A- PIP and MCP joint flexion, wrist flexion

Question 5

Extensor digitorum

Answer 5

O- lateral epicondyle of the humerus
I- base of distal phalanx of the index finger through pinky finger
A- extends MCP, PIP, and DIP joints of the four fingers, extends wrist

Question 6

Abductor pollicis longus

Answer 6

O- posterior middle portions of radius, ulna, and interosseus membrane
I- base of the thumb metacarpal
A- abducts CMC joint of the thumb, extends CMC and MCP joints of thumb