Innervation

Question 1

What are the nerve roots of the brachial plexus?

Answer 1

C5 - C8 and T1

Question 2

State the 5 main branches of the brachial plexus.

Answer 2

Musculocutaneous nerve 
Ulnar nerve 
Radial nerve 
Axillary nerve 
Median nerve 
*MURAMic acid

Question 3

What structures are innervated by the axillary nerve?

Answer 3

1. deltoid
2. teres minor
3. shoulder joint

Question 4

Name the structures innervated by the radial nerve.

Answer 4

1. muscles of posterior compartment of arm

2. muscles of posterior compartment of forearm

Question 5

Which nerves supply the anterior compartments of the arm and forearm?

Answer 5

1. musculocutaneous nerve
2. median nerve
3. ulnar nerve

Question 6

When does the axillary nerve posterior branch become the upper lateral cutaneous nerve of the arm?

Answer 6

at the lower border of the deltoid

Question 7

Which muscles are affected when the axillary nerve is damaged?

Answer 7

Deltoid and teres minor

Question 8

Describe the quadrangular space syndrome.

Answer 8

Muscles of quadrangular space hypertrophy and compress axillary nerve.