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Deltoid Muscle Anterior Posterior Supraspinatus Muscle occupies the supraspinous fossa Superior Transverse Scapular Ligament closes off suprascapular notch into a foramen Suprascapular Nerve passes UNDER superior transverse scapular ligament Suprascapular Vessels - Artery Suprascapular Vessels – Artery (cartoon) passes OVER superior transverse scapular ligament Suprascapular Vessels – Vein Infraspinatus Muscle occupies the infraspinous fossa Suprascapular n., a., v. passing the Greater Scapular Notch Teres Major Muscle Anterior Posterior Teres Minor Muscle Long Head of the Triceps Brachii Muscle Triangular Space Formed by: • the medial margin of the long head of the triceps brachii muscle; • the superior margin of the teres major muscle; and • the inferior margin of the subscapularis muscle. Quadrangular Space Formed by: • the inferior margin of the subscapularis muscle; • the surgical neck of the humerus; • the superior margin of the teres major muscle; and • the lateral margin of the long head of the triceps brachii muscle. Triangular Interval Formed by: • the lateral margin of the long head of the triceps brachii muscle; • the inferior margin of the teres major muscle; and • the medial margin of the humerus Triangular Space, Quadrangular Space, and Triangular Interval… Why should I care? Triangular Space, Quadrangular Space, and Triangular Interval… Why should I care? Axillary Nerve Posterior Circumflex Humeral Artery passing through the quadrangular space posteriorly supplies the deltoid m. and arm muscles near the surgical neck of the humerus Posterior Circumflex Humeral Vein passing through the quadrangular space posteriorly Circumflex Scapular Artery passing through the triangular space supplies teres major, minor, and infraspinatus m. Serratus Anterior Pectoralis Minor Latissimus Dorsi Axillary Vein Passes into the axilla through the deltopectoral/ clavipectoral triangle Also note the • Posterior circumflex humeral v • Subscapular v • Circumflex scapular v Deltopectoral Triangle Formed by: • pectoralis major muscle, • deltoid muscle, • Clavicle Axillary vein passes enters the axilla here Axillary Vein (in deltopectoral triangle) dives through fascia just inferior to the clavicle
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