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Hand > Intrinsic Muscles of the Hand > Flashcards

Intrinsic Muscles of the Hand Flashcards

0
Q

What is the Origin of the Opponens Pollicis?

A

Flexor Retinaculum and tubercles Scaphoid, and Trapezium

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1
Q

What are the Thenar Muscles of the hand?

A

Oppenens Pollicis, Abductor Pollicis Brevis, Flexor Pollicis Brevis, Adductor Pollicis,

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2
Q

What is the Insertion of the Opponens Pollicis?

A

Lateral Side of 1st Metacarpal

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3
Q

What innervates with opponens pollicis?

A

Recurrent Branch of median nerve (C8, T1)

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4
Q

What is the Action of the Opponens Pollicis?

A

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

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5
Q

What is the Origin of the Abductor Pollicis Brevis?

A

Flexor Retinaculum and tubercles of the Scaphoid and Trapezium

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6
Q

What is the Insertion of the Abductor Pollcis Brevis?

A

lateral side of base of proximal phalanx of thumb

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7
Q

What is the innervation of the Abductor Pollicis Brevis

A

Recurrent Branch of Median Nerve (C8,T1)

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8
Q

What is the action of the Abductor pollicis Brevis?

A

Abducts Thumb; helps oppose it

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9
Q

What is the Origin of the Flexor Pollicis Brevis

A

Flexor Retinaculum and Tubercles of Scaphoid and Trapezium

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10
Q

What is the Insertion of Flexor Pollicis Brevis?

A

Lateral side of base of proximal phalanx of thumb

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11
Q

What is the Innervation of the Flexor Pollicis Brevis?

A

Recurrent Branch of the Median Nerve (C8, T1) C8 Main Segmental

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12
Q

What is the Action of the Flexor Pollicis Brevis

A

Flexes thumb

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13
Q

What is the Origin to Adductor Pollicis

A

Oblique Head: bases of 2nd and 3rd metacarpal, capitate, and other adjacent carapals

Transverse Head: Anterior surface of the shaft of 3rd Metacarpal

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14
Q

What is the Insertion of the Adductor Pollicis

A

Medial side of base of proximal phalanx of thumb

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15
Q

What is the innervation of the Adductor Pollicis

A

Deep branch of Ulnar Nerve C8,T1

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16
Q

What is the action of the adductor pollicis

A

Adducts thumb toward lateral border of palm

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17
Q

What are the Hypothenar Muscles?

A

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

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18
Q

What is the origin of the abductor digiti minimi

A

Pisiform

19
Q

What is the insertion of the abductor digiti minimi

A

Medial side of base of proximal phalanx of 5th finger

20
Q

What is the innervation of the abductor digiti minimi?

A

Deep Branch of Ulnar Nerve (C8,T1) main segmental at T1

21
Q

What is the action of the abductor digiti minimi

A

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

22
Q

What is the origin of the flexor digiti minimi brevis

A

Hook of Hamate and Flexor Retinaculum

23
Q

What is the insertion of the flexor digiti minimi brevis

A

Medial side of base of the proximal phalanx of 5th finger

24
Q

What is the innervation of the flexor digiti minimi brevis?

A

Deep Branch of Ulnar Nerve (C8,T1) main segmental at T1

25
Q

What is the action of the flexor digiti minimi brevis?

A

flexes proximal phalanx of 5th finger

26
Q

What is the origin of the opponens digiti minimi

A

Hook of Hamate and Flexor Retinaculum

27
Q

What is the insertion of the Opponens Digiti Minimi

A

Medial border of the 5th metacarpal

28
Q

What is the innervation of the Opponens Digiti Minimi?

A

Deep Branch of Ulnar Nerve (C8,T1) main segmental at T1

29
Q

What is the action of the Opponens Digiti Minimi?

A

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

30
Q

What are the Short Muscles?

A

Lumbricals (1 and 2, 3 and 4), Dorsal Interossei 1-4, Palmar Interossei 1-3

31
Q

What is the origin of the Lumbricals, 1 and 2?

A

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

32
Q

What is the insertion of Lumbricals, 1 and 2

A

lateral sides of extensor expansions of the 2nd and 5th fingers

33
Q

What is the innervation of the Lumbricals, 1 and 2

A

Median Nerve (C8, T1) main segmental at T1

34
Q

What is the action of Lumbricals, 1 and 2

A

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

35
Q

What is the origin of the Lumbricals, 3 and 4

A

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

36
Q

What is the insertion of Lumbricals, 3 and 4

A

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

37
Q

What is the innervation Lumbricals, 3 and 4

A

Deep branch of the ulnar nerve (C8, T1) main segmental T1

38
Q

What is the action of the Lumbricals, 3 and 4

A

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

39
Q

What is the origin of the Dorsal Interossei 1-4

A

Adjacent of two metacarpals (as bipennate muscles)

40
Q

What is the insertion of Dorsal Interossei 1-4

A

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

41
Q

What is the innervation of Dorsal Interossei 1-4

A

Deep Branch of Ulnar Nerve (C8,T1) main seg T1

42
Q

What is the action of the Dorsal Interossei 1-4

A

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

43
Q

What is the origin of the Palmar Interossei 1-3

A

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

44
Q

What is the insertion of Palmar Interossei 1-3

A

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

45
Q

What is the innervation of Palmar Interossei 1-3

A

Deep Branch of the Ulnar Nerve (C8, T1) main seg T1

46
Q

What is the action of the Palmar Interossei 1-3

A

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

Hand (1 decks)

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