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Multiple Choice
Which of the following structures is NOT a part of the glenohumeral joint?
A
Glenoid cavity of the scapula
B
Head of the humerus
C
Articular capsule
D
Acromion process
Verified step by step guidance
1
Step 1: Begin by understanding the anatomy of the glenohumeral joint, which is the ball-and-socket joint of the shoulder. It is formed by the articulation of the head of the humerus (the ball) and the glenoid cavity of the scapula (the socket).
Step 2: Recognize the supporting structures of the glenohumeral joint. These include the articular capsule, which surrounds the joint and provides stability, as well as ligaments, tendons, and muscles that contribute to its function.
Step 3: Examine the acromion process, which is a bony projection of the scapula. It is located above the glenohumeral joint and serves as an attachment site for muscles and ligaments but is not directly involved in forming the joint itself.
Step 4: Compare the listed structures to determine which one does not directly contribute to the glenohumeral joint. The glenoid cavity, head of the humerus, and articular capsule are integral parts of the joint, while the acromion process is anatomically separate.
Step 5: Conclude that the acromion process is not part of the glenohumeral joint, as it is not involved in the articulation or structural formation of the joint.