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S1 Anatomy > Wrist and Hand Muscles > Flashcards

Wrist and Hand Muscles Flashcards

1
Q

muscles of the thenar eminence

A

abductor pollicis brevis
flexor pollicis brevis
opponens pollicis
adductor pollicis

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2
Q

abductor pollicis brevis

-origin

A

flexor retinaculum

tubercles of scaphoid and trepezium

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3
Q

abductor pollicis brevis

-insertion

A

lateral side of base of proximal phalanx of thumb

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4
Q

abductor pollicis brevis

-action

A

thumb abduction

helps with thumb opposition

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5
Q

abductor pollicis brevis

-innervation

A

recurrent branch of median nerve (C8, T1)

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6
Q

flexor pollicis brevis

-origin

A 
superficial head
-flexor retinaculum
-tubercle of trapezium
deep head
-floor of carpal tunnel
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7
Q

flexor pollicis brevis

-insertion

A

lateral side of base of proximal phalanx of thumb

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8
Q

flexor pollicis brevis

-action

A

flexes thumb

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9
Q

flexor pollicis brevis

-innervation

A

superficial head
-recurrent branch of median nerve (C8, T1)
deep head
-deep branch of ulnar nerve (C8, T1)

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10
Q

opponens pollicis

-origin

A

flexor retinaculum

tubercle of trapezium

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11
Q

opponens pollicis

-insertion

A

lateral side of base of proximal phalanx of thumb

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12
Q

opponens pollicis

-actions

A

opposes thumb toward center of palm

rotates it medially

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13
Q

opponens pollicis

-innervation

A

recurrent branch of median nerve (C8, T1)

also possibly deep branch of ulnar nerve

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14
Q

adductor pollicis

-origin

A 
oblique head
-bases of metacarpal 2, 3
-capitate
-adjacent carpal bones
transverse head
-anterior surface of 3rd metacarpal
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15
Q

adductor pollicis

-insertion

A

medial side of base of proximal phalanx of thumb

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16
Q

adductor pollicis

-actions

A

adducts thumb toward middle digit

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17
Q

adductor pollicis

-innervation

A

deep branch of ulnar nerve (C8, T1)

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18
Q

abductor digiti minimi

-origin

A

pisiform bone

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19
Q

abductor digiti minimi

-insertion

A

medial side of base of proximal phalanx of digit 5

20
Q

abductor digiti minimi

-action

A

abducts digit 5

21
Q

abductor digiti minimi

-innervation

A

deep branch of ulnar nerve (C8, T1)

22
Q

flexor digiti minimi brevis

-origin

A

hook of hamate

flexor retinaculum

23
Q

flexor digiti minimi brevis

-insertion

A

medial side of base of proximal phalanx of digit 5

24
Q

flexor digiti minimi brevis

-action

A

flexes proximal phalanx of digit 5

25
flexor digiti minimi brevis | -innervation
deep branch of ulnar nerve (C8, T1)
26
opponens digiti minimi | -origin
hook of hamate | flexor retinaculum
27
opponens digiti minimi | -insertion
medial border of 5th metacarpal
28
opponens digiti minimi | -action
draws 5th metacarpal bone anteriorly and rotates it to bring digit 5 into opposition to thumb
29
opponens digiti minimi | -innervation
deep branch of ulnar nerve (C8, T1)
30
muscles of hypothenar eminence
abductor digiti minimi flexor digiti minimi brevis opponens digiti minimi
31
lumbricals 1 and 2 | -origin
lateral two tendons of flexor digitorum profundus (index and middle finger)
32
lumbricals 1 and 2 | -insertion
lateral sides of extensor expansions of digits 2 and 3
33
lumbricals 1 and 2 | -action
flex digits at MCP joint | extend IP joints
34
lumbricals 1 and 2 | -innervation
median nerve (C8, T1)
35
lumbricals 3 and 4 | -origin
medial two tendons of flexor digitorum profundus (ring and little finger)
36
lumbricals 3 and 4 | -insertion
lateral sides of extensor expansions of digits 4 and 5
37
lumbricals 3 and 4 | -action
flex digits at MCP joint | extend IP joints
38
lumbricals 3 and 4 | -innervation
deep branch of ulnar nerve (C8, T1)
39
dorsal interossei 1-4 | -origin
adjacent sides of two metacarpal bones
40
dorsal interossei 1-4 | -insertion
extensor expansions and bases of proximal phalanges of digits 2-4 middle finger has 2 insertions
41
dorsal interossei 1-4 | -action
abduct digits | assist lumbricals in extension at the IP joints
42
dorsal interossei 1-4 | -innervation
deep branch of ulnar nerve (C8, T1)
43
palmar interossei 1-3 | -origin
palmar surfaces of 2nd, 4th, and 5th metacarpals
44
palmar interossei 1-3 | -insertion
extensor expansions and bases of proximal phalanges of digits 2, 4, 5
45
palmar interossei 1-3 | -action
adduct digits | assist lumbricals in flexion at the MCP joint
46
palmar interossei 1-3 | -innervation
deep branch of ulnar nerve (C8, T1)
47
short muscles of the hand
lumbricals 1-4 dorsal interossei 1-4 palmar interossei 1-3

S1 Anatomy (31 decks)

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