Superficial layer: Extensor muscles of the Posterior Compartment

Question 0

Insertion of Brachioradialis

Answer 0

Lateral surface of distal end of radius near styloid process

Question 1

Origin of Brachioradialis

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

Action of Brachioradialis

Answer 3

Relatively weak flexion of elbow joint

Maximum flexion when arm is pronated

Question 4

Origin of Extensor carpi radialis longus

Answer 4

Lateral supra-epicondylar ridge of humerus

Question 5

Insertion of Extensor carpi Radialis longis

Answer 5

Dorsal aspect of base of 2nd metacarpal

Question 6

Innervation of extensor carpi radialis longis

Answer 6

radial nerve C6 C7

Question 7

Action of Extensor carpi radialis longus

Answer 7

Extends wrist joint

abducts wrist joint

Question 8

Origin of Extensor capri radialis brevis

Answer 8

Lateral epicondyle of humerus

Question 9

insertion of extensor capri 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

Extend wrist joint
Abduct wrist joint
Brevis will be 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

Which is a continuation of deep branch of radial nerve

Question 15

Action of Extensor Digitorum

Answer 15

Extends wrist joint
Extend medial four fingers primarily at metacarpophalageal joints
and secondary at interphalangeal joint

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

Intervation of Extensor digiti minimi

Answer 18

Posterior interosseous nerve C7 C8 which is a 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

Question 20

Origin of extensor carpi ulnaris

Answer 20

Lateral epicondyle of humerus

Posterior border of ulna via aponeruosis

Question 21

Insertison of Extensor carpi ulnaris

Answer 21

Dorsal aspect of base of 5th metacarpal

Question 22

Intervation 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

adducts wrist joint

active during fist clenching