Superifical extensors of forearm

Question 1

Where is the origin of extensor carpi radialis longus?

Answer 1

Lateral supracondyle ridge of humerus

Question 2

Where does extensor carpi radialis insert?

Answer 2

Base of 2nd metacarpal

Question 3

What is the innervation of extensor carpi radialis longus?

Answer 3

Radial Nerve (C6, C7)

Question 4

What is the action of extensor carpi radialis longus and brevis?

Answer 4

Extend and abduct hand at wrist joint

Question 5

Where is the common origin for the superifical extensor muscles except radialis longus?

Answer 5

Lateral epicondyle of humerus

Question 6

Where does extensor carpi radialis brevis insert?

Answer 6

Base of 3rd metacarpal

Question 7

What is the innervation of extensor carpi radialis brevis?

Answer 7

Deep branch of radial nerve (C7, C8)

Question 8

What is the insertion for extensor digitorum

Answer 8

Extensor expansions of medial four digits (dorsal base of distal phalanges)

Question 9

What is the innervation for extensor digitorum, extensor digiti minimi and extensor carpi ulnaris?

Answer 9

Posterior interosseous nerve, the continuation of the deep branch of the radial nerve (C7, C8)

Question 10

What is the action of extensor digitorum?

Answer 10

Extends metacarpophalangeal, interphalangeal and wrist joints

Question 11

What is the insertion for extensor digiti minimi?

Answer 11

Extensor expansion of 5th digit

Question 12

What is the action of extensor digiti minimi?

Answer 12

Extends 5th digit at metacarpophalangeal and interpalangeal joints

Question 13

What is the origin of extensor carpi ulnaris?

Answer 13

Lateral epicondyle of humerus and posterior border of ulna

Question 14

What is the insertion of extensor carpi ulnaris?

Answer 14

Base of 5th metacarpal

Question 15

What is the action of extensor carpi ulnaris

Answer 15

Extends and adducts hand at wrist joint