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Functional Anatomy > Muscles of the hand > Flashcards

Muscles of the hand Flashcards

1
Q

What is the proximal attachment of the opponens pollicis, abductor pollicis brevis, and flexor pollicis brevis?

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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2
Q

What is the distal attachment of the opponens pollicis?

A

First metacarpal

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3
Q

What nerve innervates the opponens pollicis and abductor pollicis brevis?

A

Recurrent branch of median nerve (C8, T1)

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4
Q

What is the main action of the opponens pollicis?

A
  • Oppose thumb

- draws first metacarpal medially to center of palm

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5
Q

What is the distal attachment of the abductor pollicis brevis and the flexor pollicis brevis?

A

Proximal phalanx of thumb

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6
Q

What is the main action of the abductor pollicis brevis?

A

-Abducts thumb and helps to oppose it

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7
Q

What is the main action of the flexor pollicis brevis?

A

-Flexes thumb

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8
Q

What is the proximal attachment of the adductor pollicis?

A

Oblique head: bases of 2nd and 3rd metacarpals, capitate, and adjacent carpals
Transverse head: shaft of 3rd metacarpal

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9
Q

What is the distal attachment of the adductor pollicis?

A

Proximal phalanx of thumb

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10
Q

What nerve innervates the flexor pollicis brevis?

A

Superficial head: recurrent branch of median nerve (C8,T1)

Deep head: Deep branch of ulnar nerve (C8, T1)

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11
Q

What nerve innervates the adductor pollicis?

A

Deep branch of ulnar nerve (C8, T1)

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12
Q

What is the main action of the adductor pollicis?

A

-Adducts thumb toward lateral border of palm

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13
Q

What is the proximal attachment of the abductor digiti minimi?

A

Pisiform

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14
Q

What is the distal attachment of the abductor digiti minimiand the flexor digiti minimi brevis?

A

Proximal phalanx of 5th digit

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15
Q

What nerve the abductor digiti minimi, flexor digiti minimi brevis, and the opponens digiti?

A

Deep branch of ulnar nerve (C8, T1)

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16
Q

What is the main action of the abductor digiti minimi?

A
  • Abducts 5th digit

- Assists in flexion of its proximal phalanx

17
Q

What is the proximal attachment of the flexor digiti minimi brevis and the opponens digiti?

A

Hook of hamate and flexor retinaculum

18
Q

What is the main action of the flexor digiti minimi brevis?

A

-Flexes proximal phalanx of 5th digit

19
Q

What is the distal attachment of the opponens digiti?

A

5th metacarpal

20
Q

What is the main action of the opponens digiti?

A

-Draws 5th metacarpal anterior and rotates it, bringing 5th digit into opposition with thumb

21
Q

What is the proximal attachment of the 1st and 2nd lumbricals?

A

Lateral two tendons of flexor digitorum profundus (as unipennate muscles)

22
Q

What is the distal attachment of the 1st-4th lumbricles?

A

Lateral sides of extensor expansions of 2nd-5th digits

23
Q

What nerve innervates the 1st and 2nd lumbricles?

A

Median nerve (C8, T1)

24
Q

What is the main action of the 1st-4th lumbricles?

A
  • Flex metacarpophalangeal joints

- extends interphalangeal joints of 2nd-5th digits

25
Q

What is the proximal attachment of the 3rd and 4th lumbricles?

A

Medial three tendons of flexor digitorum profundus (as bipennate muscles)

26
Q

What nerve innervates the 3rd and 4th lumbricles?

A

Deep branch of ulnar nerve (C8,T1)

27
Q

What is the proximal attachment of the dorsal interossei 1st-4th?

A

Adjacent sides of two metacarpals (as bipennate muscles)

28
Q

What is the distal attachment of the dorsal interossei?

A

Proximal phalanges; extensor expansions of 2nd-4th digits

29
Q

What nerve innervates the dorsal interossei and the palmar interossei?

A

Deep branch of ulnar nerve (C8, T1)

30
Q

What is the main action of the dorsal interossei?

A
  • Abduct 2nd-4th digits from axial line

- helps flex metacarpophalangeal joints and extends interphalangeal joints

31
Q

What is the proximal attachment of the palmar interossei 1st-3rd?

A

Palmar surfaces of 2nd, 4th, and 5th metacarpals (as unipennate muscles)

32
Q

What is the distal attachment of the palmar interossei?

A

Proximal phalanges and extensor expansions of 2nd, 4th, and 5th digits

33
Q

What is the main action of the palmar interossei?

A

-Adducts 2nd, 4th, and 5th digits toward axial line

Functional Anatomy (9 decks)

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