Shoulder

Description

Frontal to anterolateral shoulder anatomy is emphasized on an adult Black male figure in neutral anatomical position, with the deltoid region highlighted over the proximal humerus. Superiorly, the acromion forms the lateral extension of the scapular spine and meets the lateral clavicle at the acromioclavicular joint, creating the bony roof over the glenohumeral articulation. The deltoid drapes from the lateral third of the clavicle, acromion, and scapular spine to its distal insertion on the deltoid tuberosity, wrapping anteriorly toward the pectoral region and posteriorly toward the scapular area. Surface landmarks remain clear. Deltoid topography matters because it is both a functional driver of abduction and a clinical corridor, with the axillary nerve and posterior circumflex humeral artery passing deep to the muscle at the level of the surgical neck of the humerus, a relationship that becomes relevant after anterior shoulder dislocation or proximal humeral fracture. IM injection placement also hinges on this anatomy: the safe zone lies in the mid-deltoid, several centimeters inferior to the acromion, to avoid the axillary nerve and the subacromial bursa. Shoulder pain patterns often trace back to subacromial impingement and rotator cuff tendinopathy under the acromial arch, so accurate acromial and deltoid orientation helps frame examination findings and rehab cues. Landmarks guide your hand. Use this rendering in gross anatomy and kinesiology teaching to correlate palpable landmarks with deltoid compartments (anterior, middle, posterior) and to introduce axillary nerve risk in trauma and injection technique. It also fits patient-facing education for vaccination counseling, sports medicine consult notes, and surgical overviews of the deltopectoral approach, where the deltoid-pectoral groove and cephalic vein trajectory are central. Anatomical accuracy verified by SciePro's Medical Advisory Board.