Nerves of the Upper Limb

Question 1

Which 5 spinal nerve roots supply the upper limb?

Answer 1

C5-T1
halfway down neck to top of chest
- contribute to brachial plexus

Question 2

Describe the brachial plexus

Answer 2

Nerve fibres are exchanged and redistributed to form 5 main peripheral nerves

• musculo-cutaneous nerve
• radial nerve
• axillary nerve
• median nerve
• ulnar nerve

Question 3

What does the musculocutaneous nerve supply?

Answer 3

Anterior portion of arm - elbow flexion

Question 4

What does the radial nerve supply?

Answer 4

runs behind posteriorly around humerus bone

• forearm
• triceps brachii
• extensor digitorum

Question 5

What does the axillary nerve supply?

Answer 5

Powers deltoid and teres minor

Question 6

Where does the median supply?

Answer 6

cubital fossa and flexor retinaculum in wrist - supranation

Question 7

Where does the ulnar nerve innervate?

Answer 7

parallel to ulnar bone runs behind humerus medial epicondyle
Innervates flexor corpi digitorum

Question 8

Which brachial plexus nerves form the ‘M’ Structure?

Answer 8

• ulnar
• median
• musculocutaneous

axillary branches off radial - both run under the M