Wrist Muscles

Question 1

Pronator teres

Answer 1

A: forearm pronation, assists with elbow flexion
O: medial epicondyle of humerus and coranoid process of the ulna
I: lateral aspect of the radius at midpoint.

Question 2

Flexor carpi radialis

Answer 2

A: Flexion and abduction of the wrist
O: medial epicondyle of humerus
I: Bases of 2nd and 3rd metacarpals

Question 3

Flexor carpi ulnaris

Answer 3

A: Flexion and adduction of wrist
O: humeral head: medial epicondyle of humerus
Ulnar head: proximal posterior ulna and olecranon process of ulna
I: Pisiform, hamate and base of 5th metacarpal

Question 4

Extensor carpi radialis longus

Answer 4

A: wrist extension and abduction (radial deviation)
O: lateral supracondylar ridge; lateral epicondyle of humerus
I: base of 2nd metacarpal

Question 5

Extensor carpi radialis brevis

Answer 5

A: wrist extension
O: lateral epicondyle of humerus
I: base of 3rd metacarpal

Question 6

Extensor carpi ulnaris

Answer 6

A: wrist extension and adduction (ulnar deviation)
O: lateral epicondyle; posterior proximal ulna
I: base of 5th metacarpal