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Flashcards in Muscles of the Hand Deck (81):
1

The intrinsic muscles of the hand can be separated into 3 groups, name them

Thenar
Hypothenar
Midpaler

2

What is the innervation of these groups of muscles

Median and Ulnar Nerves

3

Group of muslces that form the thenar eminence of the lateral side of the palm, or the rounded muscular area

Thenar muscle (pollex)

4

Name the 3 muscles of the thenar eminence

Abductor Pollicis Brevis
Flexor Pollicis Brevis
Opponens Pollicis

5

The action of the thenar eminence

Opposition of the thumb (moving it to touch tip of little finger)

6

Muscle that moves the thumb but is not part of the thenar eminence

Adductor pollicis

7

Short abductor of the thumb that forms lateral edge of the thenar eminence

Abductor pollicis brevis

8

Action of the abductor pollicis brevis

Abduction of the thumb

9

Origin of the abductor pollicis brevis

Scaphoid, Trapezium, flexor retinaculum

10

Insertion of abductor pollicis brevis

Base of the proximal phalynx of the thumb

11

Innervation

Median nerve

12

Muscle located medial to the abductor pollicis brevis that can be difficult to separate, that is a short flexor of the thumb

Flexor pollicis brevis

13

Origin of the flexor pollicis brevis

Trapezium
Flexor Retinaculum

14

Actions of the flexor pollicis brevis

Flexing the thumb
Opposition

15

Insertion of flexor pollicis brevis that often fuses with abductor pollicis brevis

Base of proximal phalynx

16

Innervation

Median Nerve

17

Muscle located deep to the abductor pollicis brevis and flexor pollicis brevis

Opponens pollicis

18

Insertion of opponens pollicis

Lateral (radial)border of the 1st metacarpal

19

Action of the opponens pollicis

Opposes the thumb

20

Innervation

Median Nerve

21

Origin of opponens pollicis

Trapezium
Flexor Retinaculum

22

Muscle that is deeply placed in hand that fills in the web of space on the palmar side of the hand

Adductor Pollicis

23

Action of the adductor pollicis

Adducts the thumb

24

Innervation of the adductor pollicis

Ulnar Nerve

25

Origin

Capitate,
Bases of metacarpals 2 and 3
3rd metacarpal

26

Insertion of adductor pollicis

Ulnar side of proximal phalynx of thumb

27

Group of three muscles that form the hypothenar eminence on the medial side of the palm that are responsible for movement of the pinky

Abductor digiti minimi
Flexor digiti minimi
Opponens digiti minimi

28

Muscle that is not part of the hypothenar compartment because it doesn't move the little finger

Palmaris Brevis

29

A group of muscles that is small tranverse bands located over the hypothenar muscles. It is relatively unimportant because it doesn't move the little finger

Palmaris Brevis

30

What does the palmaris brevis do?

Deepen the palm
Provides gripping action

31

Origin of palmaris brevis

Palmar Aponeurosis

32

Insertion of the palmaris brevis

Skin of medial side of hand

33

Innervation of the palmaris brevis

Ulnar nerve

34

The most medial muscle in the hypothenar eminence, forms the rounded contour on the medial side of the hand

Abductor Digiti Minimi

35

Actions of the abductor digiti minimi

Abducts the little finger
Aids in flexion

36

Origin of abductor digiti minimi

Pisiform bone

37

Insertion of abductor digiti minimi

Ulnar side of base of proximal phalynx of 5th digit

38

Abductor digiti minimi nnervated by

The ulnar nerve

39

Muscle located lateral to the abductor digiti minimi, often indistinguishible from the abductor

Flexor Digiti Minimi Brevis

40

Action of the flexor digiti minimi brevis

Flexes the little finger

41

Origin of the flexor digiti minimi brevis

Hook of Hamate
Flexor Retinaculum

42

Insertion of the flexor digiti minimi brevis

Ulnar side of the base of the proximal phalynx

43

Innervation of the flexor digiti minimi brevis

Ulnar nerve

44

Muscle that lies deep to the abductor and flexor digiti minimis

Opponens Digiti minimi

45

Insertion of the opponens digiti minimi

The medial border of the fifth metacarpal

46

Action of the opponens digiti minimi

Opposes the little finger

47

Innervation of the opponens digiti minimi

Ulnar Nerve

48

Origin of opponens digiti minimi

Hook of hamate
Flexor Retinaculum

49

Name the two components of the midpalmar muscles

Lumbricles and interossei

50

Actions of the lumbricles

Flex the metacarophalangeal joint at knuckles
Extend the interphalangeal joint
(bye bye muscles)

51

Actions of the interossei

Abduct and adduct the fingers

52

Group of 4 muscles, numbered 1-4 lateral to medial that attach the tendons of the flexor digitorum longus muscle

Lumbricles

53

Insertion of lumbricles

Expansion hood on dorsum of the digits

54

Lumbricles 1 & 2 innervated by
Lumbricles 3 &4 innervated by

Median Nerve
Ulnar Nerve

55

Origin of the lumbricles

Tendon of the flexor digitorum profundus

56

Action of lumbricles

Flex the metacarophalangeal joint at knuckles
Extend the interphalangeal joint
(bye bye muscles)

57

Palmar muscles located between metacarpals, between bones that are divided into dorsal and palmar

Interossei

58

The action of the interossei is in reference to what?

The third digit (axis)

59

Moving away from the axis is

Abduction

60

Moving toward the axis is

Adduction

61

Interosseis innervated by

Ulnar Nerve

62

Can the middle finger be adducted?

No, only abducted

63

Palmar muscles that bring the fingers closer together, adductors, toward the midline/axis

Palmar interossei

64

How any palmar ossei are there?

4

65

Origin of palmar interossei (unipennate)

Metacarpals

66

Insertion of palmar interossei

Proximal phalanx of the digit of origin
Extensor expansion hood

67

Actions of palmar interossei

Adduction
Flex metacarpalphalengeal joint

68

Muscles that move fingers away from the midline/axis

Dorsal Interossei

69

Action of the dorsal interossei

Abduction of the digits
Flex MCPJ
Extend IPJ

70

How many dorsal interossei are there?

4

71

Insertion of the dorsal interossei

Proximal phalanx and extensor expansion hood
-none insert into thumb and digiti minimi

72

Origins of the dorsal interossei (bipennate)

1st and 2nd metacarpal
2nd and 3rd
3rd and 4th
4th and 5th

73

Innervation of the dorsal interossei

Ulnar Nerve

74

Which nerve of hand passes deep to carpal tunnel?

Median nerve

75

Movements at the metacarpophalangeal joint (condyloid) in the 4 digits

Extension
Flexion
Abduction
Adduction
Circumduction

76

Movements at the interphalengeal joint (hinge joint)

Flexion
Extension

77

How are symptoms are carpal tunnel syndrome relieved?

Partial of complete division of flexor retinaculum

78

Where does sensory (anaesthesia, hypoaesthesia, paraestheisia) loss occur in carpal tunnel syndrome?

Lateral 3.5 digits
Thumb, index finger, middle finger, half of ring finger

79

Motor loss of carpal tunnel syndrome occurs

Thenar muscles except adductor

80

Why can't adductor be affected?

Not innervated by median nerve (ulnar nerve)

81

People with carpal tunnel syndrome are frequently unable to oppose the thumb

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