Axillary Nerve Flashcards
What are the spinal roots of the axillary nerve
C5 and C6
What are the sensory functions of the axillary nerve
Gives rise to superior lateral cutaneous nerve of arm:
Innervates skin over lower deltoid
What are the motor functions of the axillary nerve
Teres minor
Deltoid muscles
Where is the axillary nerve formed
Within axilla region
Where does the axillary nerve lie immediately after its formation
Posterior to axillary artery
Anterior to subscapularis muscle
Where does the axillary nerve run after formation
Descends to inferior border of subscapularis muscle –> exits axilla posteriorly via quadrangular space
What neurovascular structure accompanies axillary nerve through quadrangular space
Posterior circumflex humeral artery
Where does the axillary nerve terminate
Posterior scapular region
What are the branches formed from termination of the axillary nerve
Posterior terminal branch
Anterior terminal branch
What does the posterior branch of the axillary nerve innervate
Motor innervation to teres minor
Innervates skin over inferior part of deltoid
What does the anterior terminal branch of the axillary artery innervate
Motor innervation to deltoid muscle
What is the quadrangular space
Gap of muscles of the posterior scapular region
Pathway for neurovascular structures to move from axilla to posterior shoulder and arm
What forms the superior boundary of the quadrangular space
Subscapularis and teres minor
What forms the inferior boundary of the quadrangular space
Teres major
What forms the lateral boundary of the quadrangular space
Surgical neck of humerus
