Posterior forearm and dorsum of hand

Question 1

Describe the anconeus

Answer 1

passes form lateral epicondyle to olecranon
extends elbow
radial nerve C7-C8

Question 2

Describe the attachments of brachioradialis

Answer 2

distal humerus
to
radius (proximal to styloid process)

Question 3

Describe the innervation to brachioradialis

Answer 3

radial nerve

Question 4

Describe the attachments of extensor carpi radialis longus and brevis

Answer 4

longus - distal humerus to base of 2nd metacarpal

brevis - lateral epicondyle to base of 3rd metacarpal

Question 5

Describe the action of the extensor carpi radialis muscles

Answer 5

wrist extension and abduction

Question 6

Describe the innervation to the extensor carpi radialis muscles

Answer 6

posterior interosseous branch of radial nerve C7,8

Question 7

Describe the attachments of extensor carpi ulnaris

Answer 7

lateral epicondyle
to
base of 5th metacarpal

Question 8

Describe the actions of extensor carpi ulnaris

Answer 8

Wrist extension and adduction

Question 9

Which structure holds the extensor digitorum tendons against the distal forearm

Answer 9

extensor retinaculum

Question 10

Which joints does extensor digitorum act on

Answer 10

MCP, PIP, DIP and wrist

Question 11

Describe the distal attachment of extensor digitorum

Answer 11

dorsal expansion of digits 2-5

Question 12

Which two other muscles extend individual digits

Answer 12

Extensor digiti minimi
and
extensor indicis

Question 13

Describe the attachments of extensor pollicis longus

Answer 13

ulna and interosseous membrane to
distal phalanx of thumb

Question 14

Describe the actions of extensor pollicis longus

Answer 14

extension of CMC, MCP and IP joints of thumb
extends wrist

Question 15

Describe the attachments of extensor pollicis brevis

Answer 15

radius and interosseous membrane
to
proximal phalanx of thumb

Question 16

Describe the action of extensor pollicis brevis

Answer 16

CMC and MCP joint extension
wrist extension
does not extend IP joint

Question 17

Describe the attachments of abductor policis longus

Answer 17

radius, interosseous membrane and ulna to base of 1st metacarpal

Question 18

Describe the actions of abductor pollicis longus

Answer 18

abducts thumb
extends at CMCJ
extends wrist

Question 19

Describe the attachments of supinator

Answer 19

crest of ulna, lateral epicondyle, radial collateral and annular ligament of radius
to lateral radius

Question 20

Describe the innervation to the posterior compartment of the forearm

Answer 20

radial nerve
mostly posterior interosseous
C7,C8

Question 21

Which region of the hand does the radial nerve provide sensory innervation to

Answer 21

lateral aspect

Question 22

Describe the borders of the anatomical snuffbox

Answer 22

roof - superficial branch radial nerve and cephalic vein
floor - scaphoid, trapezium, base of 1st metacarpal
medial - extensor pollicis longus
lateral - extensor pollicis brevis and abductor policis longus

Question 23

What two veins communicate through the dorsal venous arch

Answer 23

cephalic and basilic

Question 24

Describe the dorsal expansion

Answer 24

CT that wraps around the digits
provides attachments

Question 25

Name the tendons crossing the dorsum of the wrist from lateral to medial

Answer 25

abductor policis longus and EPB
extensor carpi radialis (both)
EPL
extensor indicis and extensor digitorum
extensor digiti minimi
extensor carpi ulnaris