Radial Nerve

Question 1

What are the nerve roots of the radial nerve

Answer 1

C5-T1

Question 2

What is the sensory innervation of the radial nerve

Answer 2

Posterior side of forearm
Dosral surface of lateral side of palm
Dorsal surface of lateral three and a half digits

Question 3

What is the motor innervation of the radial nerve

Answer 3

Triceps brachii

Majority of extensor muscles in forearm

Question 4

What is the radial nerve a continuation of

Answer 4

Posterior cord of brachial plexus

Question 5

Where does the radial nerve arise

Answer 5

Axilla

Question 6

Where is the radial nerve situated in the axilla

Answer 6

Posterior to the axillary artery

Question 7

Where does the radial nerve exit the axilla

Answer 7

Inferiorly

Question 8

Where does the radial nerve travel down the humerus

Answer 8

Radial groove

Question 9

Where does the radial nerve supply branches on exiting the axilla

Answer 9

Long and medial heads of triceps brachii

Question 10

Where does the radial nerve supply a branch to the medial head of triceps brachii

Answer 10

After wrapping around the humerus laterally

Question 11

What structure accompanies the radial nerve during its course within the upper arm

Answer 11

Brachial artery

Question 12

How does the radial nerve enter the forerarm

Answer 12

Moves anteriorly over lateral epicondyle of bhumerus, through the cubital fossa

Question 13

How many branches does the radial nerve terminate into

Answer 13

Two
Deep branch
Superficial branch

Question 14

What is the function of the deep branch of the radial nerve

Answer 14

Motor

Innervates muscles in posterior compartment of forearm

Question 15

What is the function of the superficial branch of the radial nerve

Answer 15

Sensory

Contributes to cutaneous innervation of hand and fingers

Question 16

What muscles does the radial nerve innervate

Answer 16

Triceps brachii
Brachioradialis
Extensor carpi radialis longus
Deep branch innervates remaining muscles of forearm

Question 17

What is the term for the radial nerve once it penetrates supinator muscle

Answer 17

Posterior interosseus nerve

Question 18

What are the four branches of the radials nerve that provide cutaenous innervation to the skin of the upper limb

Answer 18

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

Question 19

What does the lower lateral cutaneous nerve of arm innervate

Answer 19

Lateral aspect of upper arm, below deltoid muscle

Question 20

What does posterior cutaneous nerve of arm innervate

Answer 20

Posterior surface of upper arm

Question 21

What does posterior cutaneous nerve of forearm innervate

Answer 21

Strip of skin down middle of posterior forearm

Question 22

What does superficial branch innervate

Answer 22

Dorsal surface of lateral three and a half digits and associated palm area