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Flashcards in Radial nerve Deck (20):
1

Course of radial nerve

Continuation of posterior cord and exits axilla posterior to brachial artery
Descends down arm in radial groove of humerus, accompanied by deep artery of arm
Moves anteriorly over lateral epicondyle through cubital fossa

2

Termination of radial nerve

Within forearm it divides into:

Deep branch
Superficial branch

3

Where do the branches arise that innervate long and medial heads of triceps brachii

Where it exits axilla
Posterior to brachial artery

4

Where does the branch arise that innervates the lateral head of triceps brachii

Where the radial nerve wraps laterally around the humerus

5

Function of radial nerve

Motor Innervation to triceps brachii

6

Function of deep branch

Motor Innervation of posterior forearm

7

What are the 4 sensory branches of the radial nerve

Lower lateral cutaneous nerve of arm
Posterior cutaneous nerve of arm
Posterior cutaneous nerve of forearm
Superficial branch

8

Function of lower lateral cutaneous nerve of arm

Sensory Innervation to lateral arm below deltoid

9

Function of posterior cutaneous nerve of arm

Sensory Innervation to posterior arm

10

Function of posterior cutaneous nerve of forearm

Sensory Innervation to strip of skin down middle of posterior forearm

11

Function of superficial branch of radial nerve

Sensory Innervation to dorsal surface of lateral 3 and 1/2 fingers (except fingertips = median) and associated dorsal area

12

How is the radial nerve damaged in the axilla

Dislocation of shoulder,
Proximal humerus fractures,
Excessive pressure on axilla

13

Consequence of damage in axilla

Paralysis of triceps brachii and posterior forearm
Wrist drop
Loss of sensation over:
Lateral and posterior arm
Posterior forearm
Dorsal surface of lateral 3 and 1/2 fingers and associated dorsal area

14

How does damage to radial nerve occur in radial groove

Fracture of shaft of humerus

15

Consequence of damage in radial groove

Triceps brachii weakened
Paralysis of posterior forearm
Wrist drop
Loss of sensation over dorsal surface of lateral 3 and 1/2 fingers and associated dorsal area

16

How does damage to deep branch occur

Fracture of radial head
Posterior dislocation of radius at elbow

17

Consequence of damage to deep branch

Paralysis of posterior forearm except supinator and extensor carpi radialis longus
No wrist drop (extensor carpi radialis longus is a strong wrist extensor)
No sensory loss

18

How does damage to superficial branch occur

Stabbing or laceration of forearm

19

Consequence of damage to superficial branch

Loss of sensation over dorsal surface of lateral 3 and 1/2 fingers and associated dorsal area

20

Spinal roots

C5-T1

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