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Gross Anatomy Exam 2 > Intrinsic Muscles Of The Hand > Flashcards

Intrinsic Muscles Of The Hand Flashcards

0
Q

Insertion of opponens pollicis

A

Lateral side of 1st metacarpal

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1
Q

Origin of opponens pollicis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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2
Q

Innervation of opponens pollicis

A

Recurrent branch of median nerve (c8 and t1)

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3
Q

Actions 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

Origin of abductor pollicis brevis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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5
Q

Insertion of abductor pollicis brevis

A

Lateral side of base of proximal phalanx of thumb

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6
Q

Innervation of abductor pollicis brevis

A

Recurrent branch of median nerve (c8 and t1)

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7
Q

Actions of abductor pollicis brevis

A

Abducts thumb, helps oppose it

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8
Q

Origin of flexor pollicis brevis (superficial and deep heads)

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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9
Q

Insertion of flexor pollicis brevis (superficial and deep heads)

A

Lateral side of base of proximal phalanx of thumb

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10
Q

Innervation of flexor pollicis brevis

A

Superficial head: Recurrent branch of median nerve (c8 and t1)
Deep head: deep branch of ulnar nerve (c8 and t1)

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11
Q

Action of flexor pollicis brevis (superficial and deep heads)

A

Flexes thumb

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12
Q

Origin of adductor pollicis (oblique head)

A

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

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13
Q

Origin of adductor pollicis (transverse head)

A

Anterior surface of shaft of 3rd metacarpal

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14
Q

Insertion of adductor pollicis (oblique and transverse heads)

A

Medial side of base of proximal phalanx of thumb

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15
Q

Innervation of adductor pollicis (oblique and transverse heads)

A

Deep branch of ulnar nerve (c8 and t1)

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16
Q

Action of adductor pollicis (oblique and transverse heads)

A

Adducts thumb toward lateral border of palm

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17
Q

Origin of abductor digiti minimi

A

Pisiform

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18
Q

Insertion of abductor digiti minimi

A

Medial side of base of proximal phalanx of 5th finger

19
Q

Innervation of abductor digiti minimi

A

Deep branch of ulnar nerve (c8 and t1)

20
Q

Actions of abductor digiti minimi

A

Abducts 5th finger

Assists in flexion of its proximal phalanx

21
Q

Origin of flexor digiti minimi brevis

A

Hook of hamate and flexor retinaculum

22
Q

Insertion of flexor digiti minimi brevis

A

Medial side of base of proximal phalanx of 5th finger

23
Q

Innervation of flexor digiti minimi brevis

A

Deep branch of ulnar nerve (c8 and t1)

24
Q

Action of flexor digiti minimi brevis

A

Flexes proximal phalanx of 5th finger

25
Q

Origin of opponens digiti minimi

A

Hook of hamate and flexor retinaculum

26
Q

Insertion of opponens digiti minimi

A

Medial border of 5th metacarpal

27
Q

Innervation of opponens digiti minimi

A

Deep branch of ulnar nerve (c8 and t1)

28
Q

Actions of opponens digiti minimi

A

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

29
Q

Origin of lumbricals 1 and 2

A

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

30
Q

Insertion of lumbricals 1 and 2

A

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

31
Q

Innervation of lumbricals 1 and 2

A

Median nerve (c8 and t1)

32
Q

Actions of lumbricals (1,2,3, and 4)

A

Flex metacarpophalangeal joints

Extend interphalangeal joints of 2nd-5th fingers

33
Q

Origin of lumbricals (3 and 4)

A

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

34
Q

Insertion of lumbricals (3 and 4)

A

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

35
Q

Innervation of lumbricals (3 and 4)

A

Deep branch of ulnar nerve (c8 and t1)

36
Q

Origin of dorsal interossei, 1-4

A

Adjacent sides of two metacarpals (as bipennate muscles)

37
Q

Insertion of dorsal interossei, 1-4

A

Bases of proximal phalanges

Extensor expansions of 2nd-4th fingers

38
Q

Innervation of dorsal interossei, 1-4

A

Deep branch of ulnar nerve (c8 and t1)

39
Q

Actions of dorsal interossei, 1-4

A

Abduct 2nd-4th fingers from axial line

Act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

40
Q

Origin of palmar interossei, 1-3

A

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

41
Q

Insertion of palmar interossei, 1-3

A

Bases of proximal phalanges

Extensor expansions of 2nd, 4th, and 5th fingers

42
Q

Innervation of palmar interossei, 1-3

A

Deep branch of ulnar nerve (c8 and t1)

43
Q

Actions of palmar interossei, 1-3

A

Adduct 2nd, 4th, and 5th fingers toward axial line

Assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

44
Q

Which intrinsic hand muscles are thenar muscles

A

Opponens pollicis, abductor pollicis brevis, flexor pollicis brevis, and adductor pollicis

45
Q

Which intrinsic hand muscles are hypothenar muscles?

A

Abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi

46
Q

Which intrinsic hand muscles are short muscles?

A

Lumbricals, dorsal interossei, and palmar interossei

Gross Anatomy Exam 2 (8 decks)

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