Movements of the Wrist Joint - The Muscles

Question 1

Which movements are permitted by the wrist joint?

Answer 1

Flexion, Extension, Abduction and Adduction

Question 2

Which muscles flex the wrist?

Answer 2

Flexor Carpi Ulnaris
Flexor Carpi Radialis
Palmaris Longus (v. weak)

Question 3

Which nerves innervate the wrist flexors?

Answer 3

Flexor Carpi Ulnaris - ulnar nerve
Flexor Carpi Radialis - median nerve
Palmaris Longus - median nerve

Question 4

Which muscles extend the wrist?

Answer 4

Extensor Carpi Ulnaris
Extensor Carpi Radialis longus
Extensor Carpi Radialis brevis

Question 5

Which nerves innervate the wrist extensors?

Answer 5

Extensor Carpi Ulnaris - radial nerve
Extensor Carpi Radialis longus - radial nerve
Extensor Carpi Radialis brevis - radial nerve

Question 6

Which muscles adduct the wrist? (ulnar deviation)

Answer 6

Extensor Carpi Ulnaris

Flexor Carpi Ulnaris

Question 7

Which nerves innervate the wrist adductors?

Answer 7

Extensor Carpi Ulnaris - radial nerve

Flexor Carpi Ulnaris - ulnar nerve

Question 8

Which muscles abduct the wrist?

Answer 8

Extensor Carpi Radialis longus
Extensor Carpi Radialis brevis
Flexor Carpi Radialis

Question 9

Which nerves innervate the wrist abductors?

Answer 9

Extensor Carpi Radialis longus - radial nerve
Extensor Carpi Radialis brevis - radial nerve
Flexor Carpi radialis - median nerve

Question 10

Name the origin and insertion of the Flexor Carpi Ulnaris

Answer 10

Origin - humeral head - medial epicondyle (i.e. via common flexor tendon). Ulnar head - posterior border of ulna; olecranon.
Insertion - pisiform, hook of hamate (via pisohamate ligament), base of the 5th metacarpal (via the pisometacarpal ligament).

Question 11

Name the origin and insertion of the Flexor Carpi Radialis

Answer 11

Origin - Medial epicondyle of the humerus

Insertion - Base of the 2nd and 3rd metacarpal bones

Question 12

Name the origin and insertion of Palmaris Longus

Answer 12

Origin - Medial epicondyle of humerus via the common flexor tendon
Insertion - Flexor retinaculum, palmar aponeurosis

Question 13

Name the origin and insertion of Extensor Carpi Radialis longus

Answer 13

Origin - Lateral supracondylar ridge of humerus

Insertion - dorsal surface of the base of the 2nd metacarpal

Question 14

Name the origin and insertion of Extensor Carpi Radialis brevis

Answer 14

Origin - lateral epicondyle of humerus via common extensor tendon
Insertion - dorsal base of the 3rd metacarpal bone

Question 15

Name the origin and insertion of Extensor Carpi Ulnaris

Answer 15

Origin - lateral epicondyle of humerus, posterior border of ulna
Insertion - dorsal surface of base of 5th metacarpal bone

Question 16

In total, how many muscles permit movement at the wrist?

Answer 16

6