MSK - Muscles of the hand Flashcards Preview

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Flashcards in MSK - Muscles of the hand Deck (54):
1

Where are the extrinsic hand muscles located? What do they control?

- Anterior and posterior compartments of the forearm

- Control crude moments and produce a forceful grip

2

Where are the intrinsic hand muscles located? What do they control?

- Located within the actual hand

- Control fine motor movements

3

Name the THREE thenar muscles. What are they responsible for?

- Opponens Pollicis

- Abductor Pollicis Brevis

- Flexor Pollicis Brevis

Responsible for movements of the thumb

4

What is the thenar eminence?

The bulge produced by the muscle bellies of the three thenar muscles

5

Which nerve innervates the thenar muscles?

Median nerve

6

What is the origin of opponens pollicis?

- Tubercule of the trapezium and associated flexor retinaculum

7

Where does opponens pollicis insert?

Lateral margin of the metacarpal of the thumb

8

What are the actions of opponens pollicis?

- Opposition of the thumb

(medially rotates and flexes the metacarpal on the trapezium)

9

Where is opponens pollicis found?

- Deep to abductor pollicis brevis

- Lateral to flexor pollicis brevis

10

What is the origin of abductor pollicis brevis?

Tubercules of scaphoid and trapezium and associated flexor retinaculum

11

Where does abductor pollicis brevis insert?

Lateral side of proximal phalanx

12

What are the actions of abductor pollicis brevis?

Abduction of the thumb

13

What is the origin of flexor pollicis brevis?

Tubercle of the trapezium and associated flexor retinaculum

14

Where does flexor pollicis brevis insert?

Base of the proximal phalanx of the thumb

15

What are the actions of flexor pollicis brevis?

Flexion of the metacarpophalangeal joint of the thumb

16

What is the arterial supply to the thenar muscles?

Superficial palmar arch

17

What are the THREE hypothenar muscles? What do they produce?

- Opponens Digiti Minimi

- Abductor Digiti Minimi

- Flexor Digiti Minimi Brevis

Produce the hypothenar eminence - muscle bulge on medial palm, at the base of 5th digit

18

What is the origin of opponens digiti minimi?

Hook of the hamate and its associated flexor retinaculum

19

Where does opponens digiti minimi insert?

Medial margin of the 5th metacarpal

20

What are the actions of opponens digiti minimi?

- Opposition of the little finger

(rotates 5th metacarpal towards the palm)

21

What is the origin of abductor digiti minimi?

- Pisiform

- Tendon of the flexor carpi ulnaris

22

Where does abductor digiti minimi insert?

Base of the proximal phalanx of the 5th digit

23

What are the actions of abductor digiti minimi?

Abduction of the 5th digit

24

What is the origin of flexor digiti minimi brevis?

Hook of the hamate and the adjacent flexor retinaculum

25

Where does flexor digiti minimi brevis insert?

Base of the proximal phalanx of the 5th digit

26

What are the actions of flexor digiti minimi brevis?

Flexion of the MCP joint of the little finger

27

Which nerve innervates the hypothenar muscles?

Ulnar nerve

28

What is the arterial supply of the hypothenar muscles?

Ulnar artery

29

How many lumbrical muscles are there? Which are unipennate and which are bipennate?

- 4, each associated with a finger

- 1 and 2 = unipennate (tendon on one side)

- 3 and 4 = bipennate (muscle on both sides of a tendon)

30

Where do the lumbricals originate?

Each come from a tendon of the flexor digitorum profundus

31

Where do the lumbricals insert?

Extensor hood of each finger

(after passing around dorsally and laterally)

32

What is the innervation of the lumbricals?

- Medial two (4th and 5th digits) = ulnar nerve

- Lateral two (2nd and 3rd digits) = median nerve

33

What is the arterial supply of the lumbricals?

- Superficial palmar arch

- Common palmar digital artery

- Deep palmar arch

- Dorsal digital artery

34

What are the actions of the lumbricals?

- Flexion of the metacarpophalangeal (MCP) joints

- Extension of the interphalangeal joints

35

Where are the interossei muscles located?

Between the metacarpals

36

What is the origin of the dorsal interossei muscles?

Each one originates from the lateral and medial surfaces of the metacarpals

37

Where do the dorsal interossei muscles insert?

- The extensor hood of their corresponding finger

- The proximal phalanx of their corresponding finger

38

What innervates the interossei muscles?

Ulnar nerve

39

What is the arterial supply of the dorsal interossei muscles?

Dorsal and metacarpal palmar artery

40

What are the actions of the dorsal interossei muscles?

- Abduction of the fingers at the MCP joints

- Assist lumbricals with flexion of MCP joints and extension of IP joints

41

What are the origins of the palmar interossei muscles?

Medial OR lateral surface of a metacarpal

42

Where do the palmar interossei muscles insert?

The extensor hood and proximal phalanx of their corresponding finger

43

What is the arterial supply of the palmar interossei muscles?

Palmar metacarpal artery of the deep palmar arch

44

What is the action of the palmar interossei muscles?

- Adduction of the fingers at the MCP joint

- Assist lumbricals with flexion of MCP joints and extension of IP joints

45

What is the origin of palmaris brevis?

Palmar aponeurosis and flexor retinaculum

46

Where does palmaris brevis insert?

Dermis of the skin on the medial margin of the hand

47

What is the innervation of palmaris brevis?

Ulnar nerve

48

What is the arterial supply of palmaris brevis?

Palmar metacarpal artery

49

What are the actions of palmaris brevis?

- Wrinkles skin of hypothenar eminence

- Deepens curvature of the hand

(Improves grip)

50

What is the origin of ambdductor pollicis?

- One head = metacarpal 3

- Other head = capitate

(along with adjacent areas of metacarpal 2&3)

51

Where does adductor pollicis insert?

Proximal phalanx of the thumb

52

What is the innervation of adductor pollicis?

Ulnar nerve

53

What is the arterial supply of adductor pollicis?

Deep palmar arch

54

What are the actions of adductor pollicis?

Adduction of the thumb

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