Muscles of Posterior Compartment of Forearm

Question 0

Brachioradialis Insertion?

Answer 0

Lateral surface of distal end of radius proximal to styloid process

Question 1

Brachioradialis Origin?

Answer 1

Proximal two thirds of lateral supra-epicondylar ridge of humerus

Question 2

Innervation of Brachioradialis?

Answer 2

Radial Nerve (C5, C6, C7)

Question 3

Actions of Brachioradialis?

Answer 3

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

Question 4

Extensor carpii radialis longus Origin?

Answer 4

Lateral supra-condylar 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 carpii radialis longus?

Answer 6

Radial nerve (C6, C7)

Question 7

Action of Extensor carpi radialis longus?

Answer 7

Extend and abduct wrist joint

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 metacarpal

Question 10

Innervation of Extensor carpi radialis brevis?

Answer 10

Deep branch of radial nerve (C7, C8)

Question 11

Action of Extensor carpi radialis brevis?

Answer 11

Extends and abduct wrist joint and also 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 branch 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 carpii ulnaris?

Answer 20

Lateral epicondule of humerus; posterior border of ulna via a shared aponeurosis

Question 21

Insertion of Extensor carpii ulnaris?

Answer 21

Dorsal aspect of base of 5th metacarpal

Question 22

Innervation of Extensor carpii ulnaris?

Answer 22

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

Question 23

Action of Extensor carpii ulnaris?

Answer 23

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

Question 24

Origin of Supinator (Deep layer muscle)?

Answer 24

Lateral epicondyle of humerus, radial collateral and anular ligaments, supinator fossa, crest of ulna

Question 25

Insertion of Supinator?

Answer 25

Lateral, posterior, and anterior surfaces of proximal third of radius

Question 26

Innervation of Supinator?

Answer 26

Deep branch of radial nerve (C7, C8)

Question 27

Action of Supinator?

Answer 27

Supinates forearm; rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)

Question 28

Adbuctor pollicis longus origin?

Answer 28

Posterior surface of proximal halves of ulna, radius and interosseous membrane

Question 29

Adbuctor pollicis longus insertion?

Answer 29

Base of 1st metacarpal

Question 30

Innervation of Adbuctor pollicis longus?

Answer 30

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

Question 31

Actions of Adbuctor pollicis longus?

Answer 31

Extends wrist joint; Abducts thumb and extends it at carpometacarpal joint

Question 32

Origin of Extensor pollicis longus?

Answer 32

Posterior surface of middle third of ulna and interosseous membrane

Question 33

Insertion of Extensor pollicis longus?

Answer 33

Dorsal aspect of base of distal phalanx of thumb

Question 34

Innervation of Extensor pollicis longus?

Answer 34

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

Question 35

Actions of Extensor pollicis longus?

Answer 35

Extends wrist joint; extends distal phalanx of thumb at interphalangeal joint; extends metacarpophalangeal and carpometacarpal joints

Question 36

Origin of Extensor pollicis brevis?

Answer 36

Posterior surface of distal third of radius and interosseous membrane

Question 37

Insertion of Extensor pollicis brevis?

Answer 37

Dorsal aspect of base of proximal phalanx of thumb

Question 38

Innervation of Extensor pollicis brevis?

Answer 38

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

Question 39

Actions of Extensor pollicis brevis?

Answer 39

Extends wrist joint; extends proximal phalanx of thumb at metacarpophalangeal joint; extends at carpometacarpal joint

Question 40

Origin of Extensor indicis?

Answer 40

Posterior surface of distal third of ulna and interosseous membrane

Question 41

Insertion of Extensor Indicis?

Answer 41

Extensor expansion of 2nd finger

Question 42

Innervation of extensor indicis?

Answer 42

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

Question 43

Actions of Extensor indicis?

Answer 43

Extends wrist joint; extend 2nd finger (enabling its independent extension); helps extend hand at wrist