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Upper Limb Muscles > Intrinsic Muscles of Hand > Flashcards

Intrinsic Muscles of Hand Flashcards

0
Q

What is the insertion of opponens pollicis?

A

Lateral side of 1st metacarpal

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1
Q

What is the origin of opponens pollicis?

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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2
Q

What innervates opponens pollicis?

A

Recurrent branch of median nerve (C8, T1)

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3
Q

What is the action of opponens pollicis?

A

To oppose thumb, it draws 1st metacarpal medially to center of palm and rotates it medially

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4
Q

What is the origin of abductor pollicis brevis?

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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5
Q

What is the insertion of abductor pollicis brevis?

A

Lateral side of base of proximal phalanx of thumb

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6
Q

What is the action of abductor pollicis brevis?

A

Abducts thumb; helps oppose it

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7
Q

What is the origin of flexor pollicis brevis?

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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8
Q

What is the insertion of flexor pollicis brevis?

A

Lateral side of base of proximal phalanx of thumb

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9
Q

What innervates flexor pollicis brevis?

A

Superficial head: Recurrent branch of median (C8, T1)

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

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10
Q

What is the action of flexor pollicis brevis?

A

Flexes thumb

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11
Q

What is the origin of adductor pollicis?

A

Oblique head: Bases of 2nd & 3rd metacarpals, capitate, adjacent carpals
Transverse head: Anterior surface of shaft of 3rd metacarpal

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12
Q

What is the insertion of adductor pollicis?

A

Medial side of base of proximal phalanx of thumb

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13
Q

What innervates adductor pollicis?

A

Deep branch of ulnar nerve (C8, T1)

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14
Q

What is the action of adductor pollicis?

A

Adducts thumb toward lateral border of palm

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15
Q

What is the origin of abductor digiti minimi?

A

Pisiform

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16
Q

What is the insertion of abductor digiti minimi?

A

Medial side of base of proximal phalanx of 5th finger

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17
Q

What innervates abductor digiti minimi?

A

Deep branch of ulnar nerve (C8, T1)

18
Q

What is the action of abductor digiti minimi?

A

Abducts 5th finger; assists in flexion of its proximal phalanx

19
Q

What is the origin of flexor digiti minimi brevis?

A

Hook of hamate and flexor retinaculum

20
Q

What is the insertion of flexor digiti minimi brevis?

A

Medial side of base of proximal phalanx of 5th finger

21
Q

What innervates flexor digiti minimi brevis?

A

Deep branch of ulnar nerve (C8, T1)

22
Q

What is the action of flexor digiti minimi brevis?

A

Flexes proximal phalanx of 5th finger

23
Q

What is the origin of opponens digiti minimi?

A

Hook of hamate and flexor retinaculum

24
Q

What is the insertion of opponens digiti minimi?

A

Medial border of 5th metacarpal

25
Q

What innervates opponens digiti minimi?

A

Deep branch of ulnar nerve (C8, T1)

26
Q

What is the action of opponens digiti minimi?

A

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

27
Q

What is the origin of lumbricals 1 & 2?

A

Lateral 2 tendons of flexor digitorum profundus (as unipennate muscles)

28
Q

What is the insertion of lumbricals 1 & 2?

A

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

29
Q

What innervates lumbricals 1 & 2?

A

Median nerve (C8, T1)

30
Q

What is the action of lumbricals 1 & 2?

A

Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers

31
Q

What is the origin of lumbricals 3 & 4?

A

Medial 3 tendons of flexor digitorum profundus (as bipennate muscles)

32
Q

What is the insertion of lumbricals 3 & 4?

A

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

33
Q

What innervates lumbricals 3 & 4?

A

Deep branch of ulnar nerve (C8, T1)

34
Q

What is the action of lumbricals 3 & 4?

A

Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers

35
Q

What is the origin of dorsal interossei (1-4)?

A

Adjacent sides of two metacarpals (as bipennate muscles)

36
Q

What is the insertion of dorsal interossei (1-4)?

A

Bases of proximal phalanges; extensor expansions of 2nd-4th fingers

37
Q

What innervates dorsal interossei (1-4)?

A

Deep branch of ulnar nerve (C8, T1)

38
Q

What is the action of dorsal interossei (1-4)?

A

Abduct 2nd-4th fingers from axial line; act with lumbricals in flexing metacarpophalangeal joints & extending interphalangeal joints

39
Q

What is the origin of palmar interossei (1-3)?

A

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

40
Q

What is the insertion of palmar interossei (1-3)?

A

Bases of proximal phalanges; extensor expansions of 2nd, 4th, & 5th fingers

41
Q

What innervates palmar interossei (1-3)?

A

Deep branch of ulnar nerve (C8, T1)

42
Q

What is the action of palmar interossei (1-3)?

A

Adduct 2nd, 4th, & 5th fingers toward axial line; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

43
Q

What is the innervation of abductor pollicis brevis?

A

Recurrent branch of median nerve (C8, T1)

Upper Limb Muscles (8 decks)

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