What two bones make up the glenohumeral joint?

The glenohumeral joint, commonly referred to as the shoulder joint, is formed by the articulation between the scapula (shoulder blade) and the humerus (the upper arm bone). The shallow socket of the scapula, known as the glenoid cavity, allows for a wide range of motion in the arm, making this joint particularly flexible. This flexibility is essential for various shoulder movements, such as lifting, reaching, and rotating the arm.

In contrast, the other combinations of bones mentioned do not form the glenohumeral joint. The femur is associated with the hip joint, while the clavicle connects the arm to the trunk but does not articulate directly with the humerus at the shoulder joint. Understanding the structure and relationship of these bones is essential for comprehending shoulder dynamics in Pilates movements and other physical activities.