- The costal surface or subscapular fossa is concave and is directed medially and forwards.It is marked by three longitudinal ridges.Another thick ridge adjoins the lateral border.This part of bone is almost rod like: IIt acts as a lever for the action of arm
- The dorsal surface gives attachment to the spine of the scapula which divides the surface into a smaller supraspinous fossa and a larger infraspinous fossa.The two fossae are connected by the spinoglenoid notch,situated lateral to the root ofthe spine.
The costal or ventral surface of the scapula presents a broad concavity, the subscapular fossa.
It provides an attachment for the subscapularis muscle.
The supraspinatous fossa (supraspinatus fossa, supraspinous fossa) of the scapula, smaller than the infraspinatous fossa, is concave, smooth, and broader at its vertebral than at its humeral end; its medial two-thirds give origin to the Supraspinatus.
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