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Anatomy > O & I: Intrinsic Hand Muscles > Flashcards

O & I: Intrinsic Hand Muscles Flashcards

1
Q

What are the 4 Thenar Muscles?

A

1) Opponens Pollicis
2) Abductor Pollicis Brevis
3) Flexor Pollicis Brevis
4) Adductor Pollicis

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2
Q

What are the 3 Hypothenar muscles?

A

1) Abductor digiti minimi
2) Flexor Digiti minimi brevis
3) Opponens digiti

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3
Q

What are the 3 short muscles?

A

1) Lumbricals
2) Dorsal interossei
3) Palmar interossei

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4
Q

Origin: Opponens Pollicis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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5
Q

Insertion: Opponens Pollicis

A

Lateral side of 1st metacarpal

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6
Q

Innervation: Opponens Pollicis

A

recurrent branch of median nerve (C8, T1)

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7
Q

Action: Opponens Pollicis

A

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

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8
Q

Origin: Abductor Pollicis Brevis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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9
Q

Insertion: Abductor Pollicis Brevis

A

Lateral side of base of proximal phalanx of thumb

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10
Q

Innervation: Abductor Pollicis Brevis

A

recurrent branch of median nerve (C8, T1)

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11
Q

Action: Abductor Pollicis Brevis

A

abducts thumb; helps oppose it

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12
Q

Origin: Flexor Pollicis Brevis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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13
Q

Insertion: Flexor Pollicis Brevis

A

Lateral side of base of proximal phalanx of thumb

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14
Q

Innervation: Flexor Pollicis Brevis

A

Superficial head: recurrent branch of median n. (C8-T1)

Deep head: deep branch of ulnar nerve (C8, T1)

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15
Q

Action: Flexor Pollicis Brevis

A

Flexes Thumb

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16
Q

Origin: Adductor Pollicis

A

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

Transverse Head: anterior surface of shaft of 3rd metacarpal

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17
Q

Insertion: Adductor Pollicis

A

medial side of base of proximal phalanx of thumb

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18
Q

Innervation: Adductor Pollicis

A

deep branch of ulnar nerve (C8, T1)

19
Q

Action: Adductor Pollicis

A

adducts thumb toward lateral border of palm

20
Q

Origin: Abductor Digiti Minimi

21
Q

Insertion: Abductor Digiti Minimi

A

medial side of base of proximal phalanx of 5th digit

22
Q

Innervation: Abductor Digiti Minimi

A

deep branch of ulnar nerve (C8, T1)

23
Q

Action: Abductor Digiti Minimi

A

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

24
Q

Origin: Flexor Digiti Minimi Brevis

A

hook of hamate and flexor retinaculum

25
Q

Insertion: Flexor Digiti Minimi Brevis

A

medial side of base of proximal phalanx of 5th digit

26
Q

Innervation: Flexor Digiti Minimi Brevis

A

deep branch of ulnar nerve (C8, T1)

27
Q

Action: Flexor Digiti Minimi Brevis

A

flexes proximal phalanx of 5th digit

28
Q

Origin: Opponens Digiti Minimi

A

hook of hamate and flexor retinaculum

29
Q

Insertion: Opponens Digiti Minimi

A

medial border of 5th metacarpal

30
Q

Innervation: Opponens Digiti Minimi

A

deep branch of ulnar nerve (C8, T1)

31
Q

Action: Opponens Digiti Minimi

A

draws 5th metacarpal anterior and rotates it bringing 5th digit into opposition with thumb

32
Q

Origin: Lumbricals

A

1st and 2nd: lateral two tendons of flexor digitroum profundus (as unipennate muscles)

3rd and 4th: medial three tendons of flexor digitorum profundus (as bipennate muscles)

33
Q

Insertion: Lumbricals

A

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

34
Q

Innervation: Lumbricals

A

1st and 2nd: median nerve (C8, T1)

3rd and 4th: deep branch of ulnar nerve (C8, T1)

35
Q

Action: Lumbricals

A

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

36
Q

Origin: Dorsal Interossei, 1st - 4th

A

adjacent sides of two metacarpals (as bipennate muscles)

37
Q

Insertion: Dorsal Interossei, 1st - 4th

A

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

38
Q

Innervation: Dorsal Interossei, 1st - 4th

A

deep branch of ulnar nerve (C8, T1)

39
Q

Action: Dorsal Interossei, 1st - 4th

A

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

40
Q

Origin: Palmar Interossei, 1st - 3rd

A

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

41
Q

Insertion: Palmar Interossei, 1st - 3rd

A

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

42
Q

Innervation: Palmar Interossei, 1st - 3rd

A

deep branch of ulnar nerve (C8, T1)

43
Q

Action: Palmar Interossei, 1st - 3rd

A

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

Anatomy (25 decks)

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