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Anatomy: first med > The Hand > Flashcards

The Hand Flashcards

(68 cards)

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1
Q

palm characteristics

A

thick layer of skin
numerous sweat glands
hairless
papillary ridges

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2
Q

what are palmar creases

A

where skin attaches to deep fascia

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3
Q

3 palmar creases

A
  • longitudinal
  • mid-palmar
  • distal creases
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4
Q

3 anterior wrist creases

A
  • distal
  • middle
  • proximal
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5
Q

what is the palmar aponeurosis

A

triangular shaped band of deep fascia

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6
Q

clinical implications of issues with palmar aponeurosis

A

Dupuytrens contracture if scarring/fibrosis of palm

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7
Q

2 eminences on palmar surface

A
  • thenar (lateral/prominent)
  • hypothenar (medial/smaller)
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8
Q

what separates 2 eminences of palm

A

central concavity

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9
Q

3 thenar muscles

A
  • abductor pollicis brevis
  • flexor pollicis brevis
  • opponens pollicis
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10
Q

thenar muscles innervation

A

median nerve

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11
Q

abductor pollicis brevis origin

A
  • trapezium
  • scaphoid
  • flexor retinaculum
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12
Q

abductor pollicis brevis insertion

A

base of proximal phalanx and extensor hood of thumb

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13
Q

abductor pollicis brevis innervation

A

recurrent branch of median nerve

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14
Q

abductor pollicis brevis action

A

abduction at metacarpophalangeal joint
assists in thumb opposition

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15
Q

flexor pollicis brevis origin

A

tubercle of trapezium and flexor retinaculum

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16
Q

flexor pollicis brevis insertion

A

base of proximal phalanx of thumb

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17
Q

flexor pollicis brevis innervation

A

recurrent branch of median nerve

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18
Q

flexor pollicis brevis action

A

flexes the thumb at metacarpophalangeal joint
assists in thumb opposition

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19
Q

opponens pollicis origin

A

tubercle of trapezium and flexor retinaculum

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20
Q

opponens pollicis insertion

A

lateral border of first metacarpal

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21
Q

opponens pollicis innervation

A

recurrent branch of median nerve

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22
Q

opponens pollicis action

A

opposition of thumb
medially rotates and flexes metacarpal 1 during opposition

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23
Q

what is the carpal tunnel

A

tunnel formed as flexor retinaculum and carpal bones enclose area

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24
Q

what is inside the carpal tunnel

A
  • 4 tendons of flexor digitorum profundus
  • 4 tendons of the flexor digitorum superficialis
  • tendon of the flexor pollicis longus
  • Median Nerve
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25
what is carpal tunnel syndrome
- entrapment of median nerve in carpal tunnel syndrome - causes numbness, tingling, wasting of thenar muscles
26
hypothenar muscles
- abductor digiti minimi - flexor digiti minimi brevis - opponens digiti minimi
27
hypothenar muscles innervation
ulnar nerve
28
abductor digiti minimi origin
pisiform bone tendon of flexor carpi ulnaris
29
abductor digiti minimi insertion
medial base of proximal phalanx of little finger
30
abductor digiti minimi innervation
ulnar nerve
31
abductor digiti minimi action
abducts little finger
32
flexor digiti minimi brevis origin
flexor retinaculum hook of hamate
33
flexor digiti minimi brevis insertion
medial base of proximal phalanx of little finger
34
flexor digiti minimi brevis innervation
ulnar nerve
35
flexor digiti minimi brevis action
flexes proximal phalanx of little finger
36
opponens digiti minimi origin
flexor retinaculum hook of hamate
37
opponens digiti minimi insertion
medial border of metacarpal 5
38
opponens digiti minimi innervation
ulnar nerve
39
opponens digiti minimi action
rotates metacarpal 5 in opposing little finger to thumb
40
Adductor pollicis origin
anterior surfaces of capitate and trapezoid metacarpals 2 and 3
41
Adductor pollicis insertion
medial base of proximal phalanx of thumb
42
Adductor pollicis innervation
ulnar nerve
43
Adductor pollicis action
adducts thumb
44
extensor expansion/hood
a triangular shaped connective tissue aponeurosis over proximal phalanges
45
Lumbrical muscles
- first lumbrical muscle - second lumbrical muscle - third Lumbrical muscle - fourth Lumbrical muscle
46
unipennate Lumbrical muscles
first and second
47
bipennate Lumbrical muscles
third and fourth
48
Lumbrical muscles origin
tendons of flexor digitorum profundus
49
Lumbrical muscles insertion
extensor expansions of digits 2-5 - extending from flexor tendon to extensor expansion - linking flexor tendons to extensors
50
first Lumbrical muscle innervation
median nerve
51
second Lumbrical muscle innervation
median nerve
52
third Lumbrical muscle innervation
ulnar nerve
53
fourth Lumbrical muscle innervation
ulnar nerve
54
lumbrical muscles action
flexes digits 2-5 at metacarpophalangeal joints extends interphalangeal joints
55
number of palmar interossei muscles
3
56
number of dorsal interossei muscles
4
57
dorsal interossei origin
adjacent sides of metacarpals (1, 2), (2, 3), (3, 4), (4, 5)
58
dorsal interossei insertion
extensor hood base of proximal phalanges of index, middle and ring fingers
59
dorsal interossei innervation
ulnar nerve
60
dorsal interossei action
abduction
61
palmar interossei origin
sides of metacarpals 2, 4, 5
62
palmar interossei insertion
extensor hood of index, ring and little fingers
63
palmar interossei innervation
ulnar nerve
64
palmar interossei action
Adduction
65
palmaris brevis origin
palmar aponeurosis and flexor retinaculum
66
palmar aponeurosis insertion
skin on medial margin of hand
67
palmar aponeurosis innervation
ulnar nerve
68
palmaris brevis action
improves grip

Anatomy: first med (17 decks)

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