Quadrangular space
- Is bounded superiorly by the teres minor and subscapularis muscles, inferiorly by the teres major muscle, medially by the long head of the triceps, and laterally by the surgical neck of the humerus.
- Transmits the axillary nerve and the posterior humeral circumflex vessels.
Triangular space (upper)
- Is bounded superiorly by the teres minor muscle, inferiorly by the teres major muscle, and laterally by the long head of the triceps.
- Contains the circumflex scapular vessels.
Triangular space (lower)
- Is formed superiorly by the teres major muscle, medially by the long head of the triceps, and laterally by the medial head of the triceps.
- Contains the radial nerve and the profunda brachii (deep brachial) artery .
Triangle of auscultation
- Is bounded by the upper border of the latissimus dorsi muscle, the lateral border of the trapezius muscle, and the medial border of the scapula; its floor is formed by the rhomboid major muscle.
- Is the site at which breathing sounds are heard most clearly.
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