Posterior Forearm and Dorsal Hand Flashcards Preview

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Flashcards in Posterior Forearm and Dorsal Hand Deck (33)
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1

Which group of the posterior compartment of the forearm crosses the elbow?

the SF group, the deep group does not

2

What is the innervation rule for the posterior forearm?

radial nerve (C5-C8)

3

What are the actions of the posterior compartment of the forearm?

extend wrist and fingers

Abduct and adduct the wrist

supinate forearm

Extend, abduct and reposition the thumb

4

What is the extensor retinaculum?

band of deep fascia that holds long extensor tendons in place as they cross the wrist, tendons are surrounded by synovial sheaths for movement

5

What are synovial "ganglionic" cysts?

fluid filled swellings that can develop within the synovial sheaths, unknown cause

movement enlarges cysts

most common: synovial sheath of extensor carpi radialis brevis

6

What is the origin for the superficial group of the posterior compartment of the forearm?

lateral epicondyle of the humerus

7

What is lateral epicondylitis (tennis elbow)?

inflammation of common extensor origin and periosteum of the lateral epicondyle

8

What are the muscles of the SF group of the posterior compartment of the forearm?

brachioradialis

extensor carpi radialis longus

extensor carpi radialis brevis

extensor carpi ulnaris

extensor digiti minimi

9

Insertion of brachioradialis? Action?

distal radius

flex elbow joint*

10

What does the brachioradialis reflex test assess?

radial nerve and the C6 spinal level

11

Insertion of extensor carpi radialis longus and extensor carpi radialis brevis? Action?

radial side of hand

extend and abduct wrist joint

12

Insertion of extensor carpi ulnaris? Actions?

ulnar side of hand

extend wrist, adduct wrist

13

Insertion of extensor digitorium? actions?

forms extensor expansions of digits 2-5

extend digits (MCP, PIP and DIP) extend wrist joint

14

insertion of extensor digiti minimi? action?

helps form extensor expansion of digit 5

extend digit 5 (MCP, PIP, DIP)

15

Origins of the deep group of the posterior compartment of the forearm?

ulna, radius, interosseous membrane

most do not cross elbow

16

What are the muscles of the deep group of the posterior compartment of the forearm?

abductor pollicis longus

extensor pollicis brevis

extensor pollicis longus

extensor indicis

supinator

17

Insertion of abductor pollicis longus? Actions?

base of MC1

abduct and extend thumb at CMC joint

18

Insertion of extensor pollicis brevis? Action?

proximal phalanx of pollux


extend thumb at CMC and MCP joints

19

Insertion of extensor pollicis longus? Action?

distal phalanx of pollux

extend thumb at CMC, MCP and IP joints

20

Insertion of extensor indicis? action?

extensor expansion of digit 2

extend digit 2 (MCP, PIP and DIP joints)

21

Insertion of supinator? Action?

proximal radius

supinate forearm

22

Name the pronators. What innervates them?

pronator teres

pronator quadratus

both innervated by median nerve

23

Name the supinators. What innervates them?

supinator- radial n.

biceps brachii-musculocutaneous n.

24

What resides in the dorsal hand?

long extensor tendons only

(no intrinsic muscles)

25

Anatomical stuff box

depression proximal to thumb on dorsal hand

Lateral border: tendons of abductor pollicis longus & extensor pollicis brevis

Medial border: tendon of extensor pollicis longus

26

What makes up the floor of the anatomical snuff box? What are its contents?

scaphoid and trapezium

contents: radial artery

27

Why is the anatomical snuff box clinically relevant?

pain and tenderness of the snuff box may indicate a scaphoid fracture

28

Where does the radial nerve travel?

in the radial groove with the deep artery and vein of the arm

29

posterior cutaneous nerve of the forearm

branch off the radial nerve, innervates the skin on the posterior forearm

30

Deep branch of the radial nerve (posterior interosseous n.)

motor to posterior compartment of the forearm