The Anatomical Characteristics Of The Humerus's Infraspinous Fossa

Description

Posterior shoulder girdle anatomy comes into focus as the scapula rotates to present its dorsal surface, with the scapular spine running transversely and separating the supraspinous fossa superiorly from the infraspinous fossa inferiorly. The infraspinous fossa occupies the lower half of the posterior scapula, a broad, shallow concavity bounded laterally by the thickened lateral border and the glenoid region, and medially by the medial (vertebral) border. As the animation progresses, the viewer tracks how the fossa sweeps inferolaterally toward the neck of the scapula, while the inferior angle marks the most caudal point of the blade. Surface contours are kept clean so bony relief reads clearly. Clinically, the infraspinous fossa matters because it provides the origin for the infraspinatus muscle, whose tendon courses laterally to insert on the middle facet of the greater tubercle of the humerus and contributes to external rotation and dynamic stabilization of the glenohumeral joint. This is a common site of traction-related pain patterns and a key landmark when interpreting posterior shoulder imaging, where muscle atrophy in the infraspinatus fossa can suggest suprascapular nerve entrapment at the spinoglenoid notch. Motion in the sequence helps, it clarifies how the scapular spine, lateral border, and glenoid align in three dimensions, which is harder to grasp from a single posterior plate. Use this animation in musculoskeletal anatomy teaching (upper limb and back), rotator cuff modules in sports medicine or orthopedics, and as a bony-landmark reference for radiology captions and surgical education on posterior shoulder approaches. It also fits patient-facing materials explaining scapular anatomy and rotator cuff pathology without oversimplifying the osteology. Anatomical accuracy verified by SciePro's Medical Advisory Board.