Nerves 1: Arm and Thigh Flashcards Preview

MD2002 > Nerves 1: Arm and Thigh > Flashcards

Flashcards in Nerves 1: Arm and Thigh Deck (23):
1

Musculocutaneous nerve: motor fibres?

flexors of the arm (BBC)
+ biceps brachii
+ brachioradialis
+ coracobrachialis

2

Musculocutaneous nerve: becomes which nerve of forearm?

lateral cutaneous nerve

3

Roots of musculocutaneous nerve?

C5/C6/C7

4

Roots of axillary nerve?

C5/C6

5

Axillary nerve: motor fibres supply?

deltoid and teres minor

6

Axillary nerve: sensory fibres supply?

skin over lower part of deltoids

7

Roots of radial nerve?

C5/C6/C7/C8/T1

8

Radial nerve: motor fibres supply?

all extensor muscles of arm and forearm

9

Radial nerve: sensory fibres supply?

posterior skin of arm, forearm and hand

10

Roots of axillary nerve?

C5/C6

11

Where does axillary nerve pass/lie?

+ posteriorly through the quadrangular space
+ lies on surgical neck of humerus with posterior circumflex artery

12

What branch of the axillary nerve supplies deltoid, teres minor and skin over lower part of deltoid?

superior lateral brachial cutaneous nerve

13

What does injury to the axillary nerve result in?

+ reduced abduction (beyond 15degrees)
+ muscular atrophy (flattened shoulder)
+ loss of sensation near inf. deltoid

14

What is the role of coracobrachialis?

+ flex and adduct arm
+ resists dislocation of shoulder and GH joint

15

What is the role of biceps brachii?

+ flex
+ resist dislocation of forearm
+ supination

16

Where does the radial nerve pass?

+ POSTERIORLY through lower triangular space with profunda brachii artery

17

What does the radial nerve divide into once in forearm?

+ superficial cutaneous branch
+ deep motor branch

18

What does the radial nerve innervate in the arm?

+ triceps brachii
+ anconeus
+ extensor carpi radialis longus
+ extensor carpi radialis brevis
+ brachioradialis

19

Where does the radial nerve supply in the forearm as deep branch?

+ extensor carpi radialis brevis
+ extensor digitorum
+ extensor digiti minimi
+ extensor carpi ulnaris
+ supinator

20

Where does the radial nerve supply in the forearm from posterior interosseous?

+ extensor indicis
+ abductor pollicis longus
+ extensor pollicis longus
+ extensor pollicis brevis

21

What does the median nerve supply?

flexors of the forearm

22

What would paralysis of extensor muscles of arm be a result of?

radial nerve injury - usually humeral shaft fracture

23

What is 'wrist drop' a presentation of?

radial nerve injury

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