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Muscles of the Hand Flashcards

1
Q

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

A

Thenar
Hypothenar
Midpaler

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2
Q

What is the innervation of these groups of muscles

A

Median and Ulnar Nerves

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3
Q

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

A

Thenar muscle (pollex)

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4
Q

Name the 3 muscles of the thenar eminence

A

Abductor Pollicis Brevis
Flexor Pollicis Brevis
Opponens Pollicis

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5
Q

The action of the thenar eminence

A

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

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6
Q

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

A

Adductor pollicis

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7
Q

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

A

Abductor pollicis brevis

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8
Q

Action of the abductor pollicis brevis

A

Abduction of the thumb

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9
Q

Origin of the abductor pollicis brevis

A

Scaphoid, Trapezium, flexor retinaculum

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10
Q

Insertion of abductor pollicis brevis

A

Base of the proximal phalynx of the thumb

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11
Q

Innervation

A

Median nerve

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12
Q

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

A

Flexor pollicis brevis

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13
Q

Origin of the flexor pollicis brevis

A

Trapezium

Flexor Retinaculum

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14
Q

Actions of the flexor pollicis brevis

A

Flexing the thumb

Opposition

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15
Q

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

A

Base of proximal phalynx

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16
Q

Innervation

A

Median Nerve

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17
Q

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

A

Opponens pollicis

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18
Q

Insertion of opponens pollicis

A

Lateral (radial)border of the 1st metacarpal

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19
Q

Action of the opponens pollicis

A

Opposes the thumb

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20
Q

Innervation

A

Median Nerve

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21
Q

Origin of opponens pollicis

A

Trapezium

Flexor Retinaculum

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22
Q

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

A

Adductor Pollicis

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23
Q

Action of the adductor pollicis

A

Adducts the thumb

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24
Q

Innervation of the adductor pollicis

A

Ulnar Nerve

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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
Word

KN 251 (17 decks)

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