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Functional Anatomy > Intrinsic Muscles of the Hand > Flashcards

Intrinsic Muscles of the Hand Flashcards

1
Q

abductor pollicis brevis (apb) prox attach

A

flexor retinaculum and tubercles of scaphoid and trapezium

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2
Q

abductor pollicis brevis (apb) distal attach

A

lateral aspect of base of proximal phalanx of thumb

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3
Q

abductor pollicis brevis (apb) axn

A

abducts thumb, assists in opposition

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4
Q

abductor pollicis brevis (apb) innervation

A

recurrent branch of median n. (C8*, T1)

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5
Q

flexor pollicis brevis (fpb) prox attach

A

superficial: from flexor retinaculum & tubercle of trapezium
deep: trapezoid and capitate bone to unite with superficial head at sesamoid bone*

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6
Q

flexor pollicis brevis (fpb) distal attach

A

superficial: lateral side of base proximal phalanx

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7
Q

flexor pollicis brevis (fpb) axn

A

flexes thumb

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8
Q

flexor pollicis brevis (fpb) innervation

A

superficial: recurrent branch of median n (C8, T1)
deep: deep branch of ulnar (C8, T1)

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9
Q

opponens pollicis prox attach

A

tubercle of trapezium and flexor retinaculum

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10
Q

opponens pollicis distal attach

A

whole lateral border and part of palmar surface of 1st metacarpal

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11
Q

opponens pollicis axn

A

draws 1st MC bone medially to oppose thumb toward center, medial (IR) rotation

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12
Q

opponens pollicis innervation

A

recurrent branch of median n (C8*, T1)

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13
Q

adductor pollicis prox attach

A

oblique head: bases of metacarpal 2 and 3, capitate, and adjacent muscles
transverse head: from the anterior surface of the body of metacarpal 3

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14
Q

adductor pollicis distal attach

A

medial side of base of proximal phalanx of thumb

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15
Q

adductor pollicis axn

A

adducts thumb

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16
Q

adductor pollicis innervation

A

deep branch of ulnar n (C8, T1*)

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17
Q

palmar interossei prox attach

A

palmar surfaces of metacarpal 2,4,5

18
Q

palmar interossei distal attach

A

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

19
Q

palmar interossei axn

A

adducts digits towards midline of hand
MCP flexion (when MCP starts flexed)
PIP and DIP extension via hood mechanism

20
Q

palmar interossei innervation

A

deep branch ulnar n. (C8, T1*)

21
Q

dorsal interossei prox attach

A

adjacent sides of 2 metacarpals

22
Q

dorsal interossei distal attach

A

extensor expansion of digits 2,3,4 and bases of prox phalanges digits 2,3,4

23
Q

dorsal interossei axn

A

abducts digits away from midline
MCP flexion possible
PIP and DIP extension via hood mechanism

24
Q

dorsal interossei innervation

A

deep branch ulnar (C8, T1*)

25
Q

lumbricals prox attach

A

radial sides of FDP tendons in palm

26
Q

lumbricals distal attach

A

radial sides of extensor hood mechanism digits 2-5

27
Q

lumbricals axn

A

strong ext at PIP and flexion and MCP regardless of MCP position

28
Q

lumbricals innervation

A

lumbricals 1 and 2: muscular branch of median (C8)
lumbricals 3 and 4: deep branch ulnar (C8, T1*)

29
Q

abductor digiti minimi prox attach

30
Q

abductor digiti minimi distal attach

A

medial side of base of proximal phalanx of digit 5

31
Q

abductor digiti minimi axn

A

abducts digit 5, may assist in MCP flexion

32
Q

abductor digiti minimi innervation

A

deep branch ulnar n (C8, T1*)

33
Q

flexor digiti minimi brevis prox attach

A

hook of hamate and flexor retinaculum

34
Q

flexor digiti minimi brevis distal attach

A

medial side of base of proximal phalanx of digit 5

35
Q

flexor digiti minimi brevis axn

A

flexes MCP of digit 5

36
Q

flexor digiti minimi brevis innervation

A

deep branch ulnar (C8, T1*)

37
Q

opponens digiti minimi prox attach

A

hook of hamate and flexor retinaculum

38
Q

opponens digiti minimi distal attach

A

medial border of metacarpal 5

39
Q

opponens digiti minimi axn

A

draws 5th metacarpal anteriorly and rotates it for opposition with the thumb

40
Q

opponens digiti minimi innervation

A

deep branch ulnar (C8, T1*)

Functional Anatomy (7 decks)

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