Dissection of the hand Flashcards Preview

Module 204 Theme 2 > Dissection of the hand > Flashcards

Flashcards in Dissection of the hand Deck (61):
1

What inserts into the hand?

Long tendons

2

Which long tendon inserts into the 5th metacarpal?

Flexor carpi ulnaris

3

What does flexor digitorum superficialis form?

4 muscle bellies that give off 4 tendons

4

What does flexor digitorum profundus give off?

4 muscle bellies that give off 4 tendons

5

Where does flexor digitorum profundus lay?

Deep to flexor digitorum superficialis

6

Where do the superficialis tendons of 3 and 4 sit?

Above 2 and 5

7

What happens to the tendons as they pass towards d2-5 through the carpal tunnel?

Enter fibrous digital sheaths

8

Name the ligaments that form the fibrous digital sheaths

Annular
Cruciate

9

What are the annular ligaments known as?

Pulleys

10

What happens to the superficialis tendons in the digits?

Split to allow flexor digitorum profundus tendons to pass through

11

Where do the flexor digitorum superficialis tendons insert?

Middle phalanx

12

Where do flexor digitorum profundus tendons insert?

Distal phalanx

13

Where does extensor carpi radialis longus sit?

Above extensor carpi radialis brevis

14

Where does extensor carpi radialis longus insert?

second metacarpal

15

Where does extensor carpi radialis brevis insert?

Third metacarpal

16

What is the function of the flexor carpi radialis muscles?

Extend and adduct the wrist

17

Where does extensor carpi ulnaris insert?

Base of fifth metacarpal

18

What is the function of extensor carpi radialis?

Extend and adduct the wrist

19

What does extensor digitorum give off?

4 tendons

20

What does extensor digitorum do?

Extends wrist and metacarpophalangeal joints in proximal and distal d2-5

21

What do the accessory extensor muscles join?

Extensor digitorum

22

What forms the anatomical snuffbox?

(from lateral to medial) the tendons of abductor pollicis longus, extensor pollicis brevis and extensor pollicis longus

23

What are the dorsal digital expansions, or extensor hoods? What are they formed from?

They are flattened aponeurotic ‘hoods’ of connective tissue over the dorsum of each finger that are formed from the tendons of extensor digitorum

24

What 3 areas can the palmar surface be divided into?

Central palmar area
Thenar eminence
Hypothenar eminence

25

What extends over the central palmar area?

Palmar aponeurosis

26

Describe the structure of the palmar aponeurosis

It extends distally from the flexor retinaculum and divides into slips, one to each of the digits 2 to 5. Each slip is attached to the fibrous flexor sheath of each digit

27

What constitutes the thenar eminence?

abductor pollicis brevis, flexor pollicis brevis and opponens pollicis

28

Where do the thenar eminence muscles originate?

flexor retinaculum and the most lateral carpal bones.

29

Where do the abductor pollicis brevis and flexor pollicis brevis muscles insert?

Proximal phalanx of the thumb

30

What is the function of the abductor pollicis brevis and flexor pollicis brevis muscles?

Abduct and flex the thumb

31

Where does the opponens pollicis muscle lay?

deep to abductor and flexor pollicis brevis

32

Where does opponens pollicis muscle insert?

First metacarpal

33

What is the function of opponens pollicis?

brings the thumb into contact with the little finger, thereby performing the movement of opposition.

34

Name the muscles that constitute the hypothenar eminence

abductor digiti minimi
flexor digiti minimi
opponens digiti minimi.

35

Where do the hypothenar eminence muscles originate?

flexor retinaculum and the most medial carpal bones.

36

Where do the abductor digiti minimi and flexor digiti minimi muscles insert?

proximal phalanx of digit 5 and abduct and flex the little finger respectively.

37

Where does opponens digiti minimi lay?

deep to the abductor and flexor digiti minimi

38

Where does opponens digiti minimi insert?

5th metacarpal

39

What is the function of opponens digiti minimi?

bring the little finger towards the thumb during opposition.

40

How many lumbrical muscles are there?

4

41

Where do the lumbrical muscles sit?

on the radial side of the tendons of flexor digitorum profundus.

42

Give the origin of the lumbrical muscles

tendons of flexor digitorum profundus

43

Where do the lumbrical muscles insert?

dorsal digital expansion

44

Name the two groups of interossei muscles

dorsal interossei and the palmar interossei

45

Where do the dorsal interossei muscles originate?

sides of the metacarpal bones

46

Where do the dorsal interossei muscles insert?

dorsal digital expansion

47

Give the origin of the 3 palmar interossei muscles

2nd, 4th and 5th metacarpals

48

Give the insertion of the 3 palmar interossei muscles

dorsal digital expansions

49

Where does the adductor pollicis muscle lay?

Deep to the thenar muscles

50

Name the two heads of adductor pollicis

Transverse
Oblique

51

Give the origin of the transverse head

third metacarpal

52

Give the origin of the oblique head

second and third metacarpals and adjacent carpal bones.

53

Where do the heads of adductor pollicis insert?

base of the proximal phalanx of the thumb

54

What is the function of adductor pollicis?

bring the abducted thumb back into contact with the index finger

55

Describe the blood supply in the hand

ulnar artery is relatively superficial and passes into the palm of the hand lateral to the pisiform bone.

The ulnar artery proceeds into the palm of the hand to form the main part of the superficial palmar arch, which is superficial relative to the long flexor tendons. From the convexity of this arch, three digital arteries arise that divide to supply blood to adjacent sides of the digits.

56

Which artery does the superficial palmar arch join?

Radial artery

57

What does the radial artery form in the palm?

Deep palmar arch

58

Name the nerves which supply d1-half of d3

Digital nerves

59

What are digital nerves a branch of?

Median nerve

60

What supplies the thenar muscles?

Recurrent branch

61

What does the ulnar nerve divide into at the wrist?

Deep and cutaneous nerves