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Musculo-Skeletal > Intrinsic Muscles of the Hand > Flashcards

Intrinsic Muscles of the Hand Flashcards

0
Q

Which muscles make up the thenar muscles?

A
  1. Abductor pollicis brevis
  2. Flexor pollicis brevis
  3. Oppenens pollicis
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1
Q

Name the intrinsic muscles of the hand?

A
  1. Thenar muscles
  2. Adductor pollicis
  3. Hypothenar muscles
  4. “Short” muscles of the hand
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2
Q

Main action of the abductor pollicis brevis?

A

Abducts thumb; helps to oppose thumb

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3
Q

Main action of the flexor pollicis brevis?

A

Flexes thumb

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4
Q

Main action of the oppenens pollicis?

A

Laterally opposes & medially rotates thumb

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5
Q

Innervation of thenar muscles?

A

Median nerve

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6
Q

Proximal attachment of thenar muscles?

A
  • Flexor retinaculum

- Tubercles of scaphoid & trapezium

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7
Q

Distal attachment of abductor pollicis muscle?

A

Lat. side of base of prox. thumb phalanx

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8
Q

Distal attachment of flexor pollicis brevis?

A

Lat. side of base of prox. thumb phalanx

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9
Q

Distal attachment of opponens pollicis?

A

Lat. side of 1st metacarpal

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10
Q

Main action of adductor pollicis?

A

Adducts thumb towards middle digit

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11
Q

Innervation of adductor pollicis?

A

Ulnar nerve

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12
Q

Proximal attachment of adductor pollicis?

A
  1. Oblique head:
    - Base of 2nd & 3rd metacarpal
    - Capitate
    - Adjacent carpals
  2. Transverse head:
    - Ant. surface of body of 3rd metacarpal
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13
Q

Distal attachment of adductor pollicis?

A

Med. side of base of proximal phalanx of thumb

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14
Q

Which muscles make up the hypothenar muscles?

A
  1. Abductor digiti minimi
  2. Flexor digiti minimi
  3. Opponens digiti minimi
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15
Q

Main action of the abductor digiti minimi?

A

Abducts 5th digits

16
Q

Main action of the flexor digiti minimi?

A

Flexes proximal phalanx of 5th digit

17
Q

Main action of the opponens digiti mini?

A

Draws 5th digit anteriorly & rotates it

18
Q

Innervation of hypothenar muscles?

A

Ulnar nerve

19
Q

Proximal attachment of the abductor digiti minimi?

A

Pisiform

20
Q

Distal attachment of abductor digiti minimi?

A

Med. side of base of proximal phalanx of digiti minimi

21
Q

Proximal attachment of the flexor digiti minimi?

A

Flexor retinaculum & hook of hamate

22
Q

Distal attachment of the flexor digiti minimi?

A

Med. side of proximal phalanx of digiti minimi

23
Q

Proximal attachment of the opponens digiti minimi?

A

Flexor retinaculum & hook of hamate

24
Q

Distal attachment of the opponens digiti minimi?

A

Med. border of 5th metacarpal

25
Q

Which muscles make up the “short” muscles of the hand?

A
  1. Lumbricals
  2. Dorsal interossei (1-4)
  3. Palmar interossei (1-3)
26
Q

Main action of the lumbricals?

A
  • Flex digits at metacarpophalangeal joints

- Extends interphalangeal joints

27
Q

Main action of the dorsal interossei muscles?

A

Abducts digits from axial line

28
Q

Main action of the palmar interossei muscles?

A

Adducts digits towards axial line

29
Q

Innervation of lumbricals?

A

1-2: median nerve

3-4: ulnar nerve

30
Q

Innervation of dorsal and palmar interossei?

A

Ulnar nerve

31
Q

Proximal attachment of the lumbricals?

A
  • 1 & 2: lateral tendons of flexor digitorum profundus

- 3 & 4: medial 2 tendons of flexor digitorum profundus

32
Q

Distal attachment of lumbricals?

A

Lat. side of extensor expansion of digitis 2-5

33
Q

Proximal attachment of the dorsal interossei?

A

Adjacent sides of 2 metacarpals

34
Q

Distal attachment of dorsal interossei?

A

Lat. sides of extensor expansions of digits 2-5

35
Q

Proximal attachment of the palmar interossei?

A

Palmar surface of 2nd, 4th & 5th metacarpals

36
Q

Distal attachment of palmar interossei?

A

Extensor expansions & bases of proximal phlanges of digits 2, 4 & 5

Musculo-Skeletal (22 decks)

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