Intrinsic Muscles of the Hand Flashcards

1
Q

Dorsal Interossei (1-4)

A

Origin: two heads from adjacent sides of the 1st through 5th MCs
Insertion: base of 2nd, 3rd, and 4th proximal phalanges, dorsal digital expansion
Action: Abd MCP 2-4 (flex MCP 2-4)
Innervation: Deep Ulnar N

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2
Q

Palmar Interossei (1-3)

A

Origin: ulnar side of 2nd MC, radial side of 4th MC, radial side of 5th MC
Insertion: Base of 2nd, 4th, and 5th proximal phalanges, dorsal expansion
Action: Add MCP 2nd, 4th, and 5th (flex MCP 2,4,5)
Innervation: Deep Ulnar N

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3
Q

Abductor pollicis brevis

A

Origin: Flexor retinaculum, scaphoid, trapezium
Insertion: base of 1st prox. phalanx
Action: Abd thumb (1st CMC)
Innervation: Median recurrent N

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4
Q

Adductor pollicis (transverse)

A

Origin: 3rd MC
Insertion: Base of 1st prox. phalanx
Action: Adduct thumb (1st CMC)(flex 1st MCP)(Opposition)
Innervation: Deep Ulnar N

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5
Q

Adductor pollicus (oblique)

A

Origin: base of 2nd MC, capitate
Insertion: Base of 1st prox. phalanx
Action: Adduct thumb (flex 1st MCP)(opposition)
Innervation: Deep ulnar N

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6
Q

Flexor pollicis brevis

A

Origin: Flexor retinaculum, capitate, and trapezium
Insertion: Base of 1st prox. phalanx
Action: Flex thumb (1st CMC and MCP)(Opposition)
Innervation: Median recurrent N

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7
Q

Opponens pollicis

A

Origin: Trapezium
Insertion: 1st MC
Action: Opposition of thumb (1st CMC)
Innervation: Median recurrent N

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8
Q

Abductor digiti minimi

A

Origin: pisiform
Insertion: base of 5th prox. phalanx
Action: Abd 5th MCP (flex 5th MCP)(ext. IP joint)
Innervation: deep ulnar N

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9
Q

Flexor Digiti Minimi

A

Origin: flexor retinaculum, hook of hamate
Insertion: Base of 5th prox. phalanx
Action: Flex 5th MCP
Innervation: Deep Ulnar N

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10
Q

Opponens Digiti Minimi

A

Origin: hook of hamate
Insertion: 5th MC
Action: opposition of 5th digit (MC)
Innervation: Deep ulnar N

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11
Q

Palmaris brevis

A

Origin: Palmar aponeurosis
Insertion: skin of hypothenar eminence
Action: tenses skin of palm
Innervation: superficial ulnar N

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12
Q

Lumbricals (1-4)

A

Origin: Radial sides of the tendons of flexor digitorum profundus
Insertion: Dorsal digital expansions 2-5
Action: Flex MCP, extend IP
Innervation: 1st and 2nd lumbricals, Median N; 3rd and 4th lumbricals, Deep Ulnar N

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