Axillary nerve

Question 1

Course of Axillary nerve within axilla

Answer 1

Continuation of posterior cord of brachial plexus
After formation it’s posterior to Axillary artery and anterior to subscapularis muscle
Exits axilla posteriorly through quadrangular space

Question 2

Termination of Axillary nerve

Answer 2

Divides into:

Posterior terminal branch
Anterior terminal branch

Question 3

Functions/course of posterior terminal branch of Axillary nerve

Answer 3

Gives motor Innervation to teres minor
Continues as upper lateral cutaneous nerve of arm
This gives sensory Innervation to regimental badge area

Question 4

Functions of anterior terminal branch of Axillary nerve

Answer 4

Motor Innervation to deltoid

Question 5

Consequences of Axillary nerve damage

Answer 5

Unable to abduct arm
Sensory loss over regimental badge area

Eventually deltoid atrophies and the greater tuberosity can be palpated in that area

Question 6

Spinal roots

Answer 6

C5 + 6