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Muscles > Short muscles of hand > Flashcards

Short muscles of hand Flashcards

1
Q

What are the short muscles of the hand?

A

1st, 2nd, 3rd and 4th lumbricals
Dorsal interossei, 1st - 4th
Palmer interossei, 1st - 3rd

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2
Q

What is the proximal attachment of the 1st and 2nd lumbricals?

A

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

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3
Q

What is the distal attachment of the 1st and 2nd lumbricals?

A

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

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4
Q

What is the innervation of the 1st and 2nd lumbricals?

A

Median nerve (C8, T1)

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5
Q

What is the main action of the 1st and 2nd lumbricals?

A

Flex metacarpophalangeal joints, extend interphalangeal joints of 2nd - 5th digits

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6
Q

What is the proximal attachment of the 3rd and 4th lumbricals?

A

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

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7
Q

What is the distal attachment of the 3rd and 4th lumbricals?

A

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

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8
Q

What is the innervation of the 3rd and 4th lumbricals?

A

Deep branch of ulnar nerve (C8, T1)

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9
Q

What is the main action of the 3rd and 4th lumbricals?

A

Flex metacarpophalangeal joints, extend interphalangeal joints of 2nd - 5th digits

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10
Q

What is the proximal attachment of the 1st to 4th dorsal interossei?

A

Adjacent sides of two metacarpals (as bipennate muscles)

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11
Q

What is the distal attachment of the 1st to 4th dorsal interossei?

A

Bases of proximal phalanges: extensor expansions of 2nd - 4th digits

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12
Q

What is the innervation of the 1st to 4th dorsal interossei?

A

Deep branch of ulnar nerve (C8, T1)

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13
Q

What is the main action of the 1st to 4th dorsal interossei?

A

Abducts 2nd, 4th and 5th digits from axial line; act with lumbricals in flexing metacarphalangeal joints and extending interphalangeal joints

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14
Q

What is the proximal attachment of the 1st to 3rd palmar interossei?

A

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

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15
Q

What is the distal attachment of the 1st to 3rd palmar interossei?

A

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

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16
Q

What is the innervation of the 1st to 3rd palmar interossei?

A

Deep branch of ulnar nerve (C8, T1)

17
Q

What is the main action of the 1st to 3rd palmar interossei?

A

Adducts 2nd, 4th and 5th digits towards axial line; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints; extensor expansions of 2nd - 4th digits

Muscles (16 decks)

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