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Gross Anatomy > Exam 2 Intrinsic Muscles of Hand > Flashcards

Exam 2 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 is the innervation of 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 innervation of abductor pollicis brevis?

A

Recurrent branch of median nerve C8, T1

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7
Q

What is the action of abductor pollicis brevis?

A

Abducts thumb, helps oppose it

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8
Q

What is the origin of flexor pollicis brevis?

A

Superficial and deep heads

Flexor retinaculum and tubercles of scaphoid and trapezium

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9
Q

What is the insertion of flexor pollicis brevis?

A

Lateral side of base of proximal phalanx of thumb

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10
Q

What is the innervation of flexor pollicis brevis?

A

Recurrent branch of median nerve C8, T1

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11
Q

What is the action of flexor pollicis brevis?

A

Flexes thumb

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12
Q

What is the origin of abductor digiti minimi?

A

pisiform

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13
Q

What is the insertion of abductor digiti minimi?

A

medial side of base of proximal phalanx of 5th finger

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14
Q

What is the innervation of abductor digiti minimi?

A

Deep branch of ulnar nerve C8, T1

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15
Q

What is the action of abductor digiti minimi?

A

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

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16
Q

What is the origin of flexor digiti minimi brevis?

A

Hook of hamate and flexor retinaculum

17
Q

What is the insertion of flexor digiti minimi brevis?

A

Medial side of base of proximal phalanx of 5th finger

18
Q

What is the innervation of flexor digiti minimi brevis?

A

Deep branch of ulnar nerve C8, T1

19
Q

What is the action of flexor digiti minimi brevis?

A

Flexes proximal phalanx of 5th finger

20
Q

What is the origin of opponens digiti minimi?

A

Hook of hamate and flexor retinaculum

21
Q

What is the insertion of opponens digiti minimi?

A

medial border of 5th metacarpal

22
Q

What is the innervation of opponens digiti minimi?

A

Deep branch of ulnar nerve C8, T1

23
Q

What is the action of opponens digiti minimi?

A

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

24
Q

What is the origin of lumbricals?

A

1 and 2: lateral two tendons of flexor digitorum profundus

3 and 4: medial three tendons of flexor digitorum profundus

25
Q

What is the insertion of lumbricals?

A

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

26
Q

What is the innervation of lumbricals?

A

Median nerve C8, T1

27
Q

What is the action of lumbricals?

A

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

28
Q

What is the origin of dorsal interossei? 1-4

A

Adjacent sides of two metacarpals

29
Q

What is the insertion of dorsal interossei 1-4?

A

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

30
Q

What is the innervation of dorsal interossei 1-4?

A

deep branch of ulnar nerve C8, T1

31
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 and extending interphalangeal joints

32
Q

What is the origin of palmar interossei 1-3?

A

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

33
Q

What is the insertion of palmar interossei 1-3?

A

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

34
Q

What is the innervation of palmar interossei 1-3?

A

Deep branch of ulnar nerve C8, T1

35
Q

What is the action of palmar interosssei 1-3?

A

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

36
Q

What is the origin of adductor pollicus? 2

A

Oblique head: Bases of 2nd and 3rd metacarpals, capitate and adjacent carpals

Transverse head: anterior surface of shaft of 3rd metacarpal

37
Q

What is the insertion if adductor pollicus?

A

Medial side of base of proximal phalanx of thumb

38
Q

What is the innervation of adductor pollicus?

A

deep branch of ulnar nerve C8, T1

39
Q

What is the action of adductor pollicus?

A

Adducts thumb toward lateral border of palm

Gross Anatomy (16 decks)

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