Forearm - posterior compartment

Question 1

Posterior/extensor/supinator compartment of forearm - superficial

Answer 1

brachioradialis
extensor carpi radialis longus
extensor carpi radialis brevis
extensor digitorum
extensor digiti minimi
extensor carpi ulnaris

Question 2

Posterior/extensor/supinator compartment of forearm - deep

Answer 2

supinator
extensor indicis
abductor pollicis longus
extensor pollicis longus
extensor pollicis brevis

Question 3

Attachments of brachioradialis

Answer 3

Proximal: proximal 2/3 of lateral supracondylar ridge of humerus
Distal: lateral, distal radius proximal to styloid

Question 4

Actions of brachioradialis

Answer 4

flexes forearm at elbow

Question 5

Blood supply of brachioradialis

Answer 5

radial recurrent artery

Question 6

Innervation of brachioradialis

Answer 6

superficial branch of radial nerve (C5, C6, C7)

Question 7

Attachments of extensor carpi radialis longus

Answer 7

Proximal: lateral supracondylar ridge of humerus
Distal: base of 2nd metacarpal

Question 8

Actions of extensor carpi radialis longus

Answer 8

extends and abducts hand at wrist

Question 9

Innervations of extensor carpi radialis longus

Answer 9

radial nerve (C6, C7)

Question 10

Attachments of extensor carpi radialis brevis

Answer 10

Proximal: lateral epicondyle of humerus
Distal: base of 3rd metacarpal

Question 11

Actions of extensor carpi radialis brevis

Answer 11

extends and abducts hand at wrist

Question 12

Innervations of extensor carpi radialis brevis

Answer 12

deep branch of radial nerve (C7, C8)

Question 13

Attachments of extensor digitorum

Answer 13

Proximal: lateral epicondyle of humerus
Distal: extensor expansions of 2nd-5th digits

Question 14

Actions of extensor digitorum

Answer 14

extends digits 2-5 at MCPs and IPs (all finger joints)

Question 15

Innervation of extensor digitorum

Answer 15

deep branch of radial nerve (C7, C8)

Question 16

Attachments of extensor digiti minimi

Answer 16

Proximal: lateral epicondyle of humerus
Distal: extensor expansion of 5th digit

Question 17

Actions of extensor digiti minimi

Answer 17

extends 5th digit at MCP and IP (joints)

Question 18

Innervation of extensor digiti minimi

Answer 18

deep branch of radial nerve (C7, C8)

Question 19

Attachments of extensor carpi ulnaris

Answer 19

Proximal: lateral epicondyle of humerus, posterior border of ulna
Distal: base of 5th metacarpal

Question 20

Actions of extensor carpi ulnaris

Answer 20

extends and adducts hand at wrist

Question 21

Innervation of extensor carpi ulnaris

Answer 21

deep branch of radial nerve (C7, C8)

Question 22

Attachments of supinator

Answer 22

Proximal: lateral epicondyle of humerus, radial collateral and annular ligaments, supinator fossa, crest of ulna
Distal: lateral posterior and anterior proximal third of radius

Question 23

Actions of supinator

Answer 23

supinates forearm

Question 24

Innervation of supinator

Answer 24

deep branch of radial nerve (C7, C8)

Question 25

Attachments of extensor indicis

Answer 25

Proximal: distal third ulna and posterior interosseuous membrane Distal: extensor expansion of 2nd digit

Question 26

Actions of extensor indicis

Answer 26

extends 2nd digit and hand at wrist

Question 27

Innervation of extensor indicis

Answer 27

posterior interosseous nerve (C7, C8) from deep branch of radial nerve

Question 28

Attachments of abductor pollicis longus

Answer 28

Proximal: proximal half of posterior ulna, radius, and interosseious membrane Distal: base of 1st metacarpal

Question 29

Actions of abductor pollicis longus

Answer 29

abducts thumb and extends it at CMC joint

Question 30

Innervation of abductor pollicis longus

Answer 30

posterior interosseous nerve (C7, C8)

Question 31

Attachments of extensor pollicis longus

Answer 31

Proximal: middle third of posterior ulna and interosseous membrane Distal: base of distal phalanx of thumb

Question 32

Actions of extensor pollicis longus

Answer 32

extends distal phalanx

Question 33

Innervation of extensor pollicis longus

Answer 33

posterior interosseous nerve (C7, C8)

Question 34

Innervation of extensor pollicis brevis

Answer 34

posterior interosseous nerve (C7, C8)

Question 35

Attachments of extensor pollicis brevis

Answer 35

Proximal: distal third of posterior radius and interosseous membrane Distal: base of proximal phalanx of thumb

Question 36

Actions of extensor pollicis brevis

Answer 36

extends proximal phalanx

Question 37

Origin of extensor mass

Answer 37

lateral epicondyle of humerus