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ESA 2 > Muscles of the Upper Limb > Flashcards

Muscles of the Upper Limb Flashcards

0
Q

Innervation of pectoralis major

A

Medial pectoral nerve
Lateral pectoral nerve
Origins in C7, C8 and T1 to the lower trunk of the brachial plexus

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1
Q

Describe the function of the pectoralis major.

A

Medial rotation of the arm

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2
Q

Function of the deltoid

A

Anterior fibres - flexion of the arm (clavicular)
Middle fibres - abduction from 15-90 degrees (acromial)
Posterior fibres - extention (spinal)

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3
Q

Innervation of the deltoid

A

Axillary nerve from the ventral rami of C5 and C6 to the posterior cord of the brachial plexus

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4
Q

Function of pectoralis minor

A

Stabalises the scapula by drawing it inferiorly and anteriorly

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5
Q

Innervation of the pectoralis minor

A

Medial pectoral nerve (C8, T1)

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6
Q

Function of the subclavius

A

Depresses the clavicle

Can protect underlying structures if the clavicle is fractured

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7
Q

Innervation of the subclavius

A

Nerve to subclavius

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8
Q

Function of the serratus anterior

A

Abduction of the scapula to assist the deltoid in abducting the arm.

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10
Q

Innervation of the serratus anterior

A

Long thoracic nerve from roots C5,6,7 of the brachial plexus

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11
Q

Innervation of the extensor carpi ulnaris

A

Posterior interosseus nerve (deep branch of the radial nerve)

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12
Q

Function of extensor carpi ulnaris

A

Extends and adducts the wrist

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13
Q

Innervation of extensor digiti minimi

A

Posterior interosseus nerve (deep branch of the radial nerve)

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14
Q

Function of extensor digiti minimi

A

Extends the little finger

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15
Q

Innervation of extensor digitorum

A

Posterior interosseus nerve (deep branch of the radial nerve)

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16
Q

Function of extensor digitorum

A

Extends the four fingers and the wrist

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17
Q

Function of the aconeus

A

Abduction of the ulna

Accessory extension at the elbow

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18
Q

Innervation of the aconeus

A

Radial nerve

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19
Q

Function of extensor carpi radialis longus

A

Extend and abduct the wrist

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20
Q

Innervation of extensor carpi radialis longus

A

Radial nerve

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21
Q

Function of extensor carpi radialis brevis

A

Extend and abduct the wrist

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22
Q

Innervation of extensor carpi radialis brevis

A

Deep branch of the radial nerve`

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23
Q

Function of extensor pollicus longus

A

Extends all joints of the thumb

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24
Q

Innervation of extensor pollicus longus

A

Posterior interosseus nerve (deep branch of the radial nerve)

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25
Q

Function of extensor indices

A

Extends the index finger

26
Q

Innervation of extensor indices

A

Posterior interosseus nerve (deep branch of the radial nerve)

27
Q

Function of supinator

A

Supination of the forearm

28
Q

Innervation of the supinator

A

Posterior interosseus nerve (deep branch of the radial nerve)

29
Q

Function of the abductor pollicus longus

A

Accessory extensor of the thumb for abduction

30
Q

Innervation of abductor pollicus longus

A

Posterior interosseus nerve (deep branch of the radial nerve)

31
Q

Function of extensor pollicus brevis

A

Extends the metacarpophalangeal/carpometacarpal joints

32
Q

Innervation of extensor pollicus brevis

A

Posterior interosseus nerve (deep branch of the radial nerve)

33
Q

What is the extensor retinaculum?

A

The aponeurosis across the back of the wrist which covers and acts as an insertion point for extensor muscles of the forearm.

34
Q

Function of opponens pollicis

A

Oppose the thumb by rotating and flexing at the metacarpophalangeal joint.

35
Q

Innervation of opponens pollicis

A

Median nerve

36
Q

Function of abductor pollicis brevis

A

Abducts the thumb

37
Q

Innervation of abductor pollicis brevis

A

Median nerve

38
Q

Function of flexor pollicis brevis

A

Flexes the metacarpophalangeal joint of the thumb

39
Q

Innervation of flexor pollicis brevis

A

Median nerve

40
Q

Function of opponens digiti minimi

A

Rotates the metacarpal of the little finger towards the thumb for opposition

41
Q

Innervation of opponens digiti minimi

A

Ulnar nerve

42
Q

Function of abductor digiti minimi

A

Abducts the little finger

43
Q

Innervation of abductor digiti minimi

A

Ulnar nerve

44
Q

Function of flexor digiti minimi brevis

A

Flexes the little finger

45
Q

Innervation of flexor digiti minimi brevis

A

Ulnar nerve

46
Q

Function of the lumbricles

A

Flex at the metacarpophalangeal joint and extend at the interphalangeal joint

47
Q

Innervation of the lumbricles

A

Medial two by the ulnar nerve

Lateral two by the median nerve

48
Q

How many dorsal interossei muscles are there?

A

4

49
Q

Function of the dorsal interossei

A

Abduct the fingers at the metacarpophalangeal joint

50
Q

Innervation of dorsal interossei

A

Ulnar nerve

51
Q

How many palmar interossei muscles are there?

A

3

52
Q

Function of the palmar interossei

A

Adduct the fingers at the metacarpophalangeal joint

53
Q

Innervation of the palmar interossei

A

Ulnar nerve

54
Q

Function of palmaris brevis

A

Deepens the curvature of the hand, improving grip

55
Q

Innervation of palmaris brevis

A

Ulnar nerve

56
Q

Function of adductor pollicis

A

Adduct the thumb

57
Q

Innervation of adductor pollicis

A

Ulnar nerve

58
Q

What are the two muscles in the palm of the hand?

A

Palmaris brevis

Adductor pollicis

59
Q

What are the muscles of the thenar eminence?

A

Opponens pollicis
Abductor pollicis brevis
Flexor pollicis brevis

60
Q

What are the muscles of the hypothenar eminence?

A

Opponens digiti minimi
Abductor digiti minimi
Flexor digiti minimi brevis

ESA 2 (46 decks)

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