shoulder

Question 1

Quadrangular (quadrilateral) space

Answer 1

Superior: lower border of teres minor
Inferior: upper border of teres major
Medial: long head of triceps
Lateral: surgical neck of humerus

Axillary nerve
Posterior humeral circumflex Artery

Question 2

Triangular space

Answer 2

Superior: lower border of teres minor
Inferior: upper border of teres major
Lateral: long head of triceps

Circumflex scapular Artery

Question 3

Triangular interval

Answer 3

Superior: lower border of teres major
Medial: long head of triceps
Lateral: shaft of humerus

Radial nerve
Profunda brachii artery