Musculoskeletal nerve

Question 1

What roots is the Musculoskeletal nerve made up from?

Answer 1

C5, C6, C7

Question 2

What is the origin of the nerve?

Answer 2

Lateral cord

From anterior divisions of superior and middle trunks

Question 3

What is the course?

Answer 3

Leaves axilla by piercing the coracobrachialis, passes beneath biceps muscle, ends as lateral cutaneous nerve of forearm

Question 4

What sensory aspects does the nerve supply?

Answer 4

Skin of lateral forearm

Question 5

What motor features does the nerve supply?

Answer 5

Anterior compartment of the arm (BBC)
Biceps- Flex elbow, supinates forearm
Brachialis- Flexes elbow
Corachobrachialis- Flexes and adducts arm at the glenohumeral joint

Question 6

How could the nerve be injured?

Answer 6

Protected by biceps so injury is rare

Stab wound

Question 7

What would the result of an injury be?

Answer 7

Numbness over lateral forearm
Wasting of anterior compartment
Weak elbow flexion, forearm supination
Absent biceps reflex