The phrase "glenoid fossa" refers to a shallow, cup-shaped cavity located in the shoulder joint. It is part of the shoulder blade and acts as a socket where the upper arm bone connects, allowing for smooth movement of the arm. Full definition
Starting at the shoulder joint, or the glenoid fossa, the orientation of it is facing down such that the humerus (the bone running from shoulder to elbow) would be vertically oriented underneath. (sciencedaily.com)
The shoulder joint — the glenoid fossa — is facing down such that the humerus (the bone running from shoulder to elbow) would be vertically oriented underneath. (news.brown.edu)
These postural changes decrease glenohumeral stability as the glenoid fossa becomes more vertical due to serratus anterior weakness leading to abduction, rotation, and winging of the scapulae. (muscleimbalancesyndromes.com)