Spaces

Question 1

Quadrangular space

Answer 1

Inferior teres minor
Surgical neck of humerus
Superior teres major
Lateral long head of triceps

Axillary nerve and posterior circumflex humeral artery and vein

Question 2

Triangular space

Answer 2

Medial triceps long head
Superior teres major
Inferior teres minor

Circumflex scapular artery and vein

Question 3

Triangular interval

Answer 3

Lateral Margin long head of triceps
Shaft of humerus
Inferior teres major

Radial nerve, profunda brachii artery, associated veins