MSK Session 6 Flashcards Preview

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Flashcards in MSK Session 6 Deck (43):
0

What allows for the precision grip?

Muscles of the hand

1

What gives the power grip?

Muscles in the forearm

2

How is blood supplied to the hand?

Ulnar artery branches into deep and superficial palmar arches
Radial anastomoses

3

What is the venous drainage of the hand?

Veins follow arteries in the dorsal venous network

4

What are the five intrinsic muscle groups of the hand?

Thenar
Lumbricals
Pollicis
Interossei
Digiti minimi

5

What causes Hand of Benediction?

Damage of the median nerve at the wrist of elbow

6

What causes wrist drop?

Damage of radial nerve at axilla/radial groove/deep superficial branch

7

Which muscles of the hand are innervated by the median nerve?

Lateral 2 lumbricals
Opponens pollicis
Abductor policis
Flexor pollicis brevis

8

What is the main action of opponens pollicis?

Oppose thumb by drawing 1st metacarpal medially to centre of Palm and rotating it medially

9

What is the main action of abductor pollicis brevis?

Abducts thumb
Assists opposition

10

What is the main action of flexor pollicis brevis?

Flex thumb

11

What is the main action of adductor pollicis brevis?

Addicts thumb toward lateral border of palm

12

What innervates adductor pollicis?

Ulnar nerve

13

What is the main action of abductor digiti minimi?

Abduct 5th digit
Assist flexion of proximal phalanx of 5th digit

14

What is the main action of flexor digiti minimi brevis?

Flex proximal phalanx of 5th digit

15

What is the main action of opponens digiti?

Draw 5th metacarpal anterior
Rotate 5th metacarpal bringing it into opposition w/thumb

16

What innervates the hypothenar muscles - ADM, FDMB and OD?

Ulnar nerve

17

What is the main action of the 1st-4th lumbricals?

Flex metacarpophalangeal joints
Extend interphalangeal joints of 2nd-5th digits

18

What is the main action of the dorsal interossei 1st-4th?

Abduct 2nd-4th digits from axial line
Act w/lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

19

What is the main action of the palmar interossei 1st-3rd?

Adduct 2nd, 4th and 5th digits towards axial line
Assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
Extensor expansions of 2nd-4th digits

20

What innervates the 3rd and 4th lumbricals and both dorsal and palmar sets of interossei?

Ulnar nerve

21

What is ulnar claw?

Damage of the ulnar nerve at the elbow or wrist

22

How do you test for Hand of Benediction?

Ask to make a fist - first three digits paralysed so only 4th and 5th bend

23

How do you test the function of the dorsal interossei?

Ask patient to spread fingers and resist closure

24

How do you test the function of the palmar interossei?

Ruler b/w fingers and pull

25

Where is cutaneous sensation loss tested for in radial nerve damage?

Anatomical snuffbox

26

What are the contents of the carpal tunnel?

4 tendons of flexor digitorum superficialis
4 tendons of flexor digitorum profundus
Median nerve

27

How is the location of the carpal tunnel found by surface anatomy?

Most distal crease of wrist when slightly flexed

28

What forms the roof of the carpal tunnel?

Flexor retinaculum

29

What is carpal tunnel syndrome?

Pain and paresthesia due median nerve compression

30

What can carpal tunnel syndrome lead to?

Thenar muscle atrophy

31

Describe the pain experienced in carpal tunnel syndrome.

Radiates to forearm
Worse at night and in morning

32

What is found in Guyon's canal?

Palmaris longus tendon
Ulnar artery
Ulnar nerve

33

What is Tinel's sign?

Tap median nerve to elicit carpal tunnel symptoms

34

What is Phalen's manoeuvre?

Hold wrist in flexion (palms/dorsal aspects pressed together) for 60s to elicit carpal tunnel syndrome symptoms

35

What are the treatments for carpal tunnel syndrome?

Splint to hold in dorsi-flexion overnight
Corticosteroid injections into tunnel
Surgical decompression

36

What forms the carpal tunnel?

Deep carpal arch
Superficial flexor retinaculum

37

What forms the carpal arch?

Laterally by scaphoid and trapezium
Medially by hook of hamate and pisisform

38

Describe the path of the superficial flexor retinaculum.

Originates in lateral side and inserts on medial side of carpal arch

39

What happens to the median nerve once it passes through the carpal tunnel?

Divides into recurrent branch and palmar digital nerve branch

40

What does the palmar digital nerve give sensory innervation to?

Palmar skin
Dorsal nail beds of lateral 3.5 digits

41

What surrounds the 8 tendons of the flexor digitorum profundus and superficialis?

Synovial sheath

42

What is the flexor carpi radialis tendon associate with?

Flexor retinaculum