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Anatomy > Hand Muscles > Flashcards

Hand Muscles Flashcards

1
Q

Abductor pollicis brevis origin

A

Flexor retinaculum, scaphoid, and trapezium

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2
Q

Abductor pollicis brevis insertion

A

Radial side of proximal phalanx of thumb

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3
Q

Abductor pollicis brevis innervation and spinal level

A

Median C8, T1

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4
Q

Abductor pollicis brevis action

A

Abduct thumb, assist flexion at MCP joint

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5
Q

Flexor pollicis brevis origin

A

Flexor retinaculum, trapezium, and capitate

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6
Q

Flexor pollicis brevis insertion

A

Base of palmar surface of proximal phalanx of thumb

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7
Q

Flexor pollicis brevis innervation and spinal level

A

Median C8,T1

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8
Q

Flexor pollicis brevis action

A

Flexes MCP & CMC joint ; assist opposition and adduction of thumb

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9
Q

Opponens pollicis origin

A

Flexor retinaculum and trapezium

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10
Q

Opponens pollicis insertion

A

The whole length of the radial side of palmar surface of first metacarpal

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11
Q

Opponens pollicis innervation and spinal level

A

Median C8 T1

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12
Q

Opponens pollicis action

A

Opposition of the thumb

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13
Q

Adductor pollicis origin

A

Transverse head: palmar surface of the body of the 3rd metacarpal
Oblique head: palmar surface of the bases of 2nd and 3rd metacarpals and capitate (sometimes trapezoid and trapezium)

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14
Q

Adductor pollicis insertion

A

Ulnar Side of palmar surface of base of proximal phalanx of thumb

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15
Q

Adductor pollicis innervation and spinal level

A

Deep branch of ulnar C8 T1

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16
Q

Adductor pollicis action

A

adduct thumb (1st metacarpal) ; assists flexion at carpometacarpal joint, assists in opposition; weak flexor at MCP

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17
Q

Abductor digiti minimi origin

A

Pisiform bone

18
Q

Abductor digiti minimi insertion

A

Ulnar surface of base of proximal phalanx of little finger, extensor hood

19
Q

Abductor digiti minimi innervation and spinal level

A

Deep branch of ulnar C8 T 1

20
Q

Abductor digiti minimi action

A

Abduct little finger at MCP joint; assist flexion at MCP ; weak IP extensor

21
Q

Flexor digiti minimi brevis origin

A

Hook of hamate and flexor retinaculum

22
Q

Flexor digit minimi brevis insertion

A

Ulnarly and slightly palmarly on the proximal phalanx of little finger

23
Q

Flexor digit minimi innervation and spinal level

A

Deep branch of ulnar C8 T1

24
Q

Flexor digit minimi brevis action

A

Flex little finger (proximal phalanx at MCP)

25
Q

Opponens digit minimi origin

A

Hook of hamate and flexor retinaculum

26
Q

Opponens digit minimi insertion

A

Ulnar border of shaft of 5th metacarpal

27
Q

Opponens digit minimi innervation and spinal level

A

Deep branch of ulnar C8 T1

28
Q

Opponens digit minimi action

A

Draws little finger anteriorly (out of palm) and rotates it radially, bringing it into opposition with thumb and deepening the hollow of the hand

29
Q

Lumbricals origin

A

1st and 2nd: radial sides of flexor digitorum tendons to index and middle finger respectively
3rd and 4th : adjacent sides of FDP tendons to middle and ring, and ring and little fingers respectively

30
Q

Lumbricals insertion

A

Radial sides of extensor aponeurosis (dorsal hood) of fingers 2-5

31
Q

Lumbricals innervation and spinal level

A

1st and 2nd: median C8 T1

3rd and 4th: deep branch of ulnar C8 T1

32
Q

Lumbricals action

A

Flex at MCP joints, extend at IP joints

33
Q

Dorsal interossei origin

A

Adjacent surface of 1st/2nd, 2nd/3rd, 3rd/4th, and 4th/5th metacarpals

34
Q

Dorsal interossei insertion

A

1st: radial side of base of proximal phalanx of 2nd digit and dorsal hood
2nd: radial side of base of proximal phalanx of 3rd digit and dorsal hood
3rd: ulnar side of base of proximal phalanx of 3rd digit and dorsal hood
4th: ulnar side of base of proximal phalanx of 4th digit and dorsal hood

35
Q

Dorsal interossei innervation and spinal level

A

Deep branch of ulnar C8 T1

36
Q

Dorsal interossei action

A

Abduct 2nd, 3rd, 4th digits; assist MCP flexion and IP extension

37
Q

Palmar interossei origin

A

1st: ulnar side of 2nd metacarpal
2nd: radial side of 4th metacarpal
3rd: radial side of 5th metacarpal

38
Q

Palmar interossei insertion

A

1st: ulnar side of proximal phalanx of 2nd digit and dorsal hood
2nd: radial side of proximal phalanx of 4th digit and dorsal hood
3rd: radial side of proximal phalanx of 5th digit and dorsal hood

39
Q

Palmar interossei innnervation and spinal level

A

Deep branch of ulnar C8 T1

40
Q

Palmar interossei action

A

Adduct 2nd, 4th, and 5th digits; assist MCP flexion and IP extension

Anatomy (8 decks)

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