Quadrangular Space - Borders and Contents

Overview

• Quadrangular Space: An anatomical space located in the posterior axilla region.
• Function: Acts as a conduit for structures passing between the axilla and the posterior compartment of the arm.

Borders

• Superior Border: Inferior margin of the teres minor muscle.
• Lateral Border: Surgical neck of the humerus.
• Medial Border: Long head of the triceps brachii muscle.
• Inferior Border: Superior aspect of the teres major muscle.

Contents

• Axillary Nerve: Passes through the space to innervate the deltoid and teres minor muscles, and provides sensation to the skin covering the shoulder.
• Posterior Circumflex Humeral Artery and Vein: Vascular structures that supply blood to the surrounding muscles and skin.

Clinical Relevance

Quadrangular Space Syndrome

• Cause: Compression of the axillary nerve and posterior circumflex humeral artery.
• Etiology: May occur due to hypertrophy of muscular borders or fibrotic bands formation.
• Symptoms: Pain and paraesthesia in the axillary nerve distribution, pain upon shoulder abduction and external rotation.

Visual Aids

• Figures: Images typically illustrate the boundaries and contents of the quadrangular space.
• 3D Models and Dissection Images: Available resources for a deeper understanding of the anatomy.

Note: The site offers pro features like interactive 3D models and dissection images to enhance learning, and quizzes to test knowledge.