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Deltoid Anatomy Origin: • Anterior Deltoid ◦ Anterior border & upper surface of the lateral third of the clavicle • Lateral Deltoid ◦ Surface of the lateral third of the clavicle • Posterior Deltoid ◦ Inferior edge of the spine of the scapula Insertion: • Anterior Deltoid ◦ Deltoid tuberosity of the humerus • Lateral Deltoid ◦ Deltoid tuberosity of the humerous • Posterior Deltoid ◦ Deltoid tuberosity of the humerus Major Arteries: • Primarily posterior circumflex humeral artery Neural Innervation: • Axillary nerve (C5-C6) Physiology Concentric Functions: • Anterior Deltoid ◦ Shoulder abduction, flexion, transverse flexion & internal rotation • Lateral Deltoid ◦ Shoulder Abduction, flexion & transverse abduction • Posterior Deltoid ◦ Shoulder extension, transverse extension, transverse abduction & external rotation Eccentric Functions: • Anterior Deltoid ◦ Decelerates shoulder extension & external rotation • Lateral Deltoid ◦ Assists in decelerating shoulder adduction • Posterior Deltoid ◦ Decelerates shoulder flexion, internal rotation & horizontal adduction Isometric Function: • Anterior Deltoid Assists in dynamically stabilizing the glenohumeral joint during functional movements & works as a neutralizer during shoulder abduction • Lateral Deltoid Assists in dynamically stabilizing the glenohumeral joint during functional movements • Posterior Deltoid Assists in dynamically stabilizing the glenohumeral joint during functional movements and works as a neutralizer during shoulder abduction
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