Deltoid Muscles, Posterior View

Description

Posterior shoulder anatomy dominates the frame, with the deltoid muscle draping over the glenohumeral joint and wrapping from the lateral clavicle and acromion to the deltoid tuberosity of the humerus. From this angle, the spinal (posterior) part of the deltoid reads as a broad, inferolateral slope from the scapular spine and acromion toward the proximal lateral arm. The posterior axillary fold and the interval toward the scapular spine provide context for how the shoulder cap relates to the upper back. Clinically, this posterior perspective matters when you need to separate deltoid contour from rotator cuff and scapular mechanics. Posterior deltoid fiber direction is a key teaching point for shoulder extension and horizontal abduction, and it helps explain compensatory patterns when the supraspinatus or infraspinatus is painful or weak. It also supports surface anatomy discussions around injection safety: posterior deltoid bulk can mislead palpation, while the axillary nerve and posterior circumflex humeral artery course deep to the deltoid near the surgical neck of the humerus. Use this asset in gross anatomy and kinesiology modules covering shoulder musculature, in sports medicine materials on posterior shoulder strengthening and rotator cuff rehab, or in clinical education where clear posterior landmarks are needed for examination and procedural planning. Anatomical accuracy verified by SciePro's Medical Advisory Board.