On the lateral angle of the scapula
is a shallow pyriform
surface, the glenoid cavity
(or glenoid fossa of scapula
, "socket"), which is directed lateralward and forward and articulates with the head of the humerus
; it is broader below than above and its vertical diameter is the longest.
The surface is covered with cartilage in the fresh state; and its margins, slightly raised, give attachment to a fibrocartilaginous structure, the glenoid labrum, which deepens the cavity.