Teres Major Under the Skin, Posterior View

Description

Seen from a posterior, subcutaneous perspective in an adult male, the teres major occupies the inferolateral margin of the scapula and runs superolaterally toward the proximal humerus. Its broad belly arises from the dorsal surface of the inferior angle and adjacent lateral border of the scapula, then narrows as it approaches the medial lip of the intertubercular sulcus (crest of the lesser tubercle). Superior to it sits the teres minor, separated by a subtle fascial plane, while the latissimus dorsi lies inferiorly and often blends with teres major near their humeral insertions. Skin and superficial fascia frame the region. Posterior exposure clarifies why teres major is commonly taught as a companion to latissimus dorsi during shoulder extension, adduction, and medial rotation, yet it remains anatomically distinct from the rotator cuff and does not stabilize the glenohumeral joint like teres minor. Palpation and surgical planning benefit from recognizing its relationship to the quadrangular space and triangular interval, where the axillary nerve and posterior circumflex humeral artery (quadrangular space) and the radial nerve with profunda brachii artery (triangular interval) traverse just superior or medial to the muscle’s course. A frequent point of confusion. This view settles it. Use this asset for upper limb and back anatomy modules, sports medicine texts discussing internal rotator overuse, and operative atlases covering posterior shoulder approaches where teres major and latissimus dorsi form key surface and deep landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.