Posterior Forearm Muscles Superficial Layer

Question 0

Insertion of the Brachioradialis

Answer 0

Lateral surface of distal end of radius proximal to styloid process

Question 1

Origin of Brachioradialis

Answer 1

Proximal two thirds of lateral supraepicondylar ridge of humerus

Question 2

Innervation of Brachioradialis

Answer 2

Radial Nerve (C5, C6, C7)

Question 3

Action of Brachioradialis

Answer 3

Relatively weak flexion of elbow joint, maximal when forearm is in midpronated position

Question 4

Origin of Extensor Carpi Radialis Longus

Answer 4

Lateral supra-epicondylar ridge of humerus

Question 5

Insertion of Extensor carpi radialis longus

Answer 5

Dorsal aspect of base of 2nd metacarpal

Question 6

Innervation of Extensor Carpi Radialis longus

Answer 6

Radial Nerve (C6, C7)

Question 7

Action of Extensor carpi radialis longus

Answer 7

Extend and abduct wrist joint; extensor carpi radialis brevis active during fist clenching.

Question 8

Origin of Extensor Carpi Radialis Brevis

Answer 8

Lateral epicondyle of humerus

Question 9

Insertion of Extensor carpi radialis brevis

Answer 9

Dorsal aspect of base of 3rd metacarpel

Question 10

Innervation of Extensor Carpi Radialis Brevis

Answer 10

Deep brach of radial nerve (C7, C8)

Question 11

Action of Extensor Carpi Radialis Brevis

Answer 11

Extend and abduct wrist joint; active during fist clenching

Question 12

Origin of Extensor Digitorum

Answer 12

Lateral Epicondyle of humerus

Question 13

Insertion of Extensor Digitorum

Answer 13

Extensor expansions of medial four fingers

Question 14

Innervation of Extensor Digitorum

Answer 14

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

Question 15

Action of Extensor Digitorum

Answer 15

Extend wrist joint

Extend medial four fingers primarily at metacarpophalangeal joints, secondarily at interphalangeal joints

Question 16

Origin of Extensor Digiti Minimi

Answer 16

Lateral Epicondyle of humerus

Question 17

Insertion of Extensor Digiti Minimi

Answer 17

Extensor expansion of 5th finger

Question 18

Innervation of Extensor digiti minimi

Answer 18

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

Question 19

Action of Extensor Digiti Minimi

Answer 19

Extends wrist joint

Extends 5th finger primarily at metacarpophalangeal joint, secondarily at interphalangeal joint.

Question 20

Origin of Extensor Carpi Ulnaris

Answer 20

Lateral Epicondyle of Humerus; posterior border of ulna via a shared aponeurosis

Question 21

Insertion of Extensor Carpi Ulnaris

Answer 21

Dorsal aspect of base of 5th metacarpal

Question 22

Innervation of Extensor Carpi Ulnaris

Answer 22

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

Question 23

Action of Extensor Carpi Ulnaris

Answer 23

Extends and adducts wrist joint(also active during fist clenching)