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Intrinsic Muscles of Hand > Short Muscles > Flashcards

Short Muscles Flashcards

0
Q

What is the distal attachment of lumbricals 1 and 2?

A

lateral side of extensor expansions of 2nd-3rd fingers

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1
Q

What is the proximal attachment of lumbricals 1 and 2?

A

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

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2
Q

What innervates the lumbricals 1 and 2?

A

median nerve (C8, T1)

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3
Q

What is the main action of lumbricals 1 and 2?

A

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

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4
Q

What is the origin of lumbricals 3 and 4?

A

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

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5
Q

What is the distal attachment of lumbricals 3 and 4?

A

lateral side of extensor expansions of 4th-5th fingers

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6
Q

What innervates lumbricals 3 and 4?

A

deep branch of ulnar nerve (C8, T1)

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7
Q

What is the main action of lumbricals 3 and 4?

A

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

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8
Q

What is the proximal attachment of dorsal interosseous 1-4?

A

adjacent sides of two metacarpals (as bipennate muscles)

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9
Q

What is the distal attachment of dorsal interosseous 1-4?

A

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

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10
Q

What innervates dorsal interosseous 1-4?

A

deep branch of ulnar nerve (C8, T1)

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11
Q

What is the main action of dorsal interosseous 1-4?

A

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

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12
Q

What is the proximal attachment of palmar interosseous 1-3?

A

palmar surface of 2nd-4th, and 5th metacarpals (as unipennate muscles)

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13
Q

What is the distal attachment of palmar interosseous 1-3?

A

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

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14
Q

What innervates palmar interosseous 1-3?

A

deep branch of ulnar nerve (C8, T1)

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15
Q

What are the main actions of palmar interosseous 1-3?

A

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

Intrinsic Muscles of Hand (3 decks)

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