Shoulder blade

Structure of the shoulder blade (Scapula)

The shoulder blade, Scapula, is a flat three-sided bone whose margins, Margo medialis (1), Margo lateralis (2), and Margo superior (3), are separated by angles, Angulus superior (4), Angulus inferior (5) and the sloped Angulus lateralis (6).
The anterior surface, the Facies costalis, is flat and slightly hollowed (Fossa subscapularis). It sometimes shows well-formed line musculares. The facies posterior is divided by the shoulder bones, spina scapulae (7), into a smaller fossa supraspinata (8) and a larger fossa infraspinata (9). The spina scapulae begins with a triangular field (trigonum spinae) on the medial side, increases laterally in height and ends with a flattened extension, the shoulder height, acromion (10).

Close to the lateral end is an oval articular surface for connection to the clavicle, the Facies articularis clavicularis.

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