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Muscle Biology > Muscles of the hand > Flashcards

Muscles of the hand Flashcards

1
Q

thenar eminence

A

muscles of the thumb
abductor pollicis brevis
flexor pollicis brevis
opponens pollicis brevis

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2
Q

origin of abductor pollicis brevis

A

scaphoid
trapezium
flexor retinaculum

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3
Q

insertion of abductor pollicis brevis

A

base of first proximal phalanx

radial sesamoid bone

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4
Q

innervation of abductor pollicis brevis

A

median nerve

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5
Q

origin of flexor pollicis brevis

A

trapezium

flexor retinaculum

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6
Q

insertion of flexor pollicis brevis

A

base of proximal phalanx

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7
Q

innervation of flexor pollicis brevis

A

median nerve

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8
Q

action of flexor pollicis brevis

A

Flexes the metacarpophalangeal (MCP) joint of the thumb

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9
Q

action of abductor pollicis brevis

A

Abducts the thumb

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10
Q

origin of opponens pollicis

A

trapezium

associated flexor retinaculum.

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11
Q

insertion of opponens pollicis

A

lateral margin of the metacarpal of the thumb (i.e. the first metacarpal).

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12
Q

innervation of opponens pollicis

A

median nerve

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13
Q

Action of opponens pollicis

A

Opposes the thumb, by medially rotating and flexing the metacarpal on the trapezium

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14
Q

hypothenar muscles

A 
muscles of the little finger;
opponens digiti minimi
abductor digiti minimi
flexor digiti minimi 
palmaris brevis
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15
Q

origin of abductor digiti minimi

A

pisiform

tendon of the flexor carpi ulnaris.

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16
Q

insertion of abductor digiti minimi

A

proximal phalanx of 5th finger

dorsal aponeurosis of 5th finger

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17
Q

innervation of abductor digiti minimi

A

ulnar nerve

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18
Q

origin of opponens digiti minimi

A

hook of hamate

flexor retinaculum,

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19
Q

insertion of opponens digiti minimi

A

the medial margin of metacarpal V.

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20
Q

action of opponens digiti minimi

A

It rotates the metacarpal of the little finger towards the palm, producing opposition

21
Q

innervation of opponens digiti minimi

A

ulnar nerve

22
Q

origin of flexor digiti minimi

A

hook of hamate

flexor retinaculum,

23
Q

insertion of flexor digiti minimi

A

the base of the proximal phalanx of the little finger.

24
Q

action of flexor digiti minimi

A

Flexes the MCP joint of the little finger

25
Q

innervation of flexor digiti minimi

A

ulnar nerve

26
Q

bipennate muscles of lumbricals

A

3 and 4 - ring finger and pinky finger

27
Q

unipennate muscles of lumbricals

A

1 and 2 - index and middle finger

28
Q

origin of lumbricals

A

flexor digitorum profundus

29
Q

insertion of lumbricals

A

extensor hood

30
Q

action of lumbricals

A

Flexion at the MCP joint and extension at the interphalangeal (IP) joints of each digit.

31
Q

innervation of lumbricals in index and middle finger

A

median nerve

32
Q

innervation of lumbricals in ring finger and pinky finger

A

ulnar nerve

33
Q

origin of dorsal interossei

A

lateral and medial surfaces of the metacarpals.

34
Q

insertion of dorsal interossei

A

extensor hood and proximal phalanx of each finger.

35
Q

action of dorsal interossei

A

abduct the fingers at the MCP joint.

36
Q

innervation of dorsal interossei

A

ulnar nerve

37
Q

origin of palmar interossei

A

medial or lateral surface of a metacarpal

38
Q

insertion of palmar interossei

A

extensor hood and proximal phalanx of same finger.

39
Q

action of palmar interossei

A

Adducts the fingers at the MCP joint.

40
Q

innervation of palmar interossei

A

ulnar nerve

41
Q

origin of palmaris brevis

A

palmar aponeurosis and flexor retinaculum,

42
Q

insertion of palmaris brevis

A

dermis of the skin on the medial margin of the hand.

43
Q

action of palmaris brevis

A

Wrinkles the skin of the hypothenar eminence and deepens the curvature of the hand, improving grip.

44
Q

innervation of palmaris brevis

A

ulnar nerve

45
Q

origin of adductor pollicis

A

One head originates from metacarpal III. The other head originates from the capitate and adjacent areas of metacarpals II and III.

46
Q

insertion of adductor pollicis

A

Both attach into the base of the proximal phalanx of the thumb.

47
Q

action of adductor pollicis

A

Adductor of the thumb.

48
Q

innervation of adductor pollicis

A

ulnar nerve

Muscle Biology (25 decks)

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