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Spaces in the upper arm |
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| Quadrangular space | |
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Boundaries Medially: Long head of triceps brachii Laterally: Surgical neck of Humerus Superioly: Teres minor Inferiorly: Teres major Contents Posterior circumflex humeral artery Axillary nerve Significance Contents liable to injury in shoulder dislocation of fracture surgical neck of Humerus |
| Upper triangular space | |
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Boundaries Superior: Teres minor Inferior: Teres major Laterally: Long head triceps Contents: Circumflex scapular artery |
| Lower triangular space | |
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Boundaries Medially: Long head triceps brachii Laterally: Radial groove Superiorly: Teres major Contents Profunda brachii artery (PBA) Radial nerve Significance Injury to radial nerve and PBA in fracture humeral shaft |
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