Extensor-Supinator Muscles of Forearm

Question 1

Origin of Brachioradialis

Answer 1

Proximal 2.3 of supra-epicondylar ridge of humerus

Question 2

Inserion of Brachioradialis

Answer 2

Lateral distal end of radius proximal to styloid process

Question 3

Innervation of Brachioradialis

Answer 3

Radial Nerve

Question 4

Action of brachioradialis

Answer 4

Weak flexion of forearm: Maximal in mid-pronated position

Question 5

Origin of extensor carpi radialis longus

Answer 5

Lateral supra-epicondylar ridge of humerus

Question 6

Insertion of extensor carpi radialis longus

Answer 6

Dorsal aspect of base of 2nd metacarpal

Question 7

Innervation of Extensor carpi radialis longus

Answer 7

radial nerve

Question 8

action of Extensor carpi radialis longus

Answer 8

extend hand
abduct hand
fist clenching

Question 9

origin or extensor carpi radialis brevis

Answer 9

common extensor origin

Question 10

Insertion of extensor carpi radialis brevis

Answer 10

dorsal aspect of base of 3rd metacarpal

Question 11

Innervation of extensor carpi radialis brevis

Answer 11

deep branch of radial nerve

Question 12

action of extensor carpi radialis brevis

Answer 12

extends hand
abducts hand
fist clenching

Question 13

Origin of extensor digitorum

Answer 13

common extensor origin

Question 14

insertion of extensor digitorum

Answer 14

extensor expansions of medial 4 digits

Question 15

Innervation of extensor digitorum

Answer 15

deep branch of radial nerve

Question 16

action of extensor digitorum

Answer 16

extends medial 4 digits mostly at metacarpophalangeal joints

Question 17

origin of extensor digiti minimi

Answer 17

common extensor origin

Question 18

Insertion of extensor digiti minimi

Answer 18

extensor expansion of 5th digit

Question 19

innnervation of extensor digiti minimi

Answer 19

deep branch of radial nerve

Question 20

action of extensor digiti minimi

Answer 20

extends 5th digit mostly at metacarpophalangeal joint

Question 21

Origin of extensor carpi ulnaris

Answer 21

Common extensor origin

Posterior border of ulna via shared aponeurosis

Question 22

Insertion of extensor carpi ulnaris

Answer 22

dorsal aspect of base of 5th metacarpal

Question 23

innervation of extensor carpi ulnaris

Answer 23

deep branch of radial nerve

Question 24

action of extensor carpi ulnaris

Answer 24

extends hand
adducts hand
first clenching

Question 25

Origin of supinator

Answer 25

lateral epicondyle of humerus radial collateral and annular liaments supinator fossa crest of ulna

Question 26

Insertion of supinator

Answer 26

Lateral third of radius on the lateral, posterior and anterior sides

Question 27

Innervation of supinator

Answer 27

deep branch of radial nerve

Question 28

Action of supinator

Answer 28

supinates forearm

Question 29

Origin of extensor indicis

Answer 29

Posterior surface of distal 1/3 of ulna | Interosseous membrane

Question 30

insertion of extensor indicis

Answer 30

extensor expansion of 2nd digit

Question 31

innervation of extensor indicis

Answer 31

posterior interosseous nerve (continuation of deep radial artery)

Question 32

action of extensor indicis

Answer 32

extends 2nd digit | extends hand

Question 33

Origin of abductor pollicis longus

Answer 33

Posterior proximal half of ulna, radius and interosseous membrane

Question 34

Insertion of abductor pollic longus

Answer 34

base of 1st metacarpal

Question 35

Innervation of abductor pollicis longus

Answer 35

posterior interosseous nerve (continuation of deep radial artery)

Question 36

Action of abductor pollicis longus

Answer 36

abducts thumb | extends it at carpometacarpal joint

Question 37

Origin of extensor pollicis longus

Answer 37

Posterior middle 1/3 of ulna and interosseous membrane

Question 38

Insertion of extensor pollicis longus

Answer 38

Dorsal aspect of base of distal phalanx of thumb

Question 39

Innervation of extensor pollicis longus

Answer 39

posterior interosseous nerve (continuation of deep radial artery)

Question 40

Action of extensor pollicis longus

Answer 40

extends distal phalanx of thumb | extends carpophalangeal and carpometacarpal joints

Question 41

Origin of extensor pollicis brevis

Answer 41

posterior surface of distal third of radius adjacent interosseous membrane

Question 42

Insertion of extensor pollicis brevis

Answer 42

dorsal aspect of proximal base of thumb

Question 43

Innervation of extensor pollicis brevis

Answer 43

posterior interosseous nerve (continuation of deep radial artery)

Question 44

Action of extensor pollicis brevis

Answer 44

extends proximal phalanx of thumb | extends carpometacarpal joint

Question 45

Which muscles constitute the Superficial Posterior Group

Answer 45

Extensor Carpi Ulnararis Extensor Digiti Minimi Extensor Digitorum Anconeus

Question 46

Which muscles constitutes the Deep Snuffbox Group

Answer 46

Abductor Pollis Longus Extensor Pollis Longus Extensor Pollis Brevis

Question 47

Which muscles constitute the Deep "Other" group

Answer 47

Supinator | Extensor Indicis

Question 48

Which muscles constitute the superficial lateral group

Answer 48

Extensor carpi radialis longus Extensor carpi radialis brevis Brachioradialis