all movements of the shoulder girdle have a common pivot point at the…
The common pivot point for all movements of the shoulder girdle is called the Sternoclavicular Joint (SC Joint)
The common pivot point for all movements of the shoulder girdle is called the Sternoclavicular Joint (SC Joint). The SC Joint is the point where the clavicle (collarbone) meets the sternum (breastbone) in the front of the chest.
The SC Joint is a synovial joint, meaning it is a freely movable joint that allows for a wide range of motion. It is a saddle joint, which means the articulating surfaces of the clavicle and sternum fit together like a rider in a saddle.
The movements of the shoulder girdle that occur at the SC Joint include:
1. Elevation: This movement refers to the upward movement of the shoulder girdle, where the clavicle moves superiorly towards the head. For example, during shrugging of the shoulders.
2. Depression: This movement refers to the downward movement of the shoulder girdle, where the clavicle moves inferiorly away from the head. For example, during relaxation or returning to a neutral position from an elevated position.
3. Protraction: This movement refers to the forward movement of the shoulder girdle away from the midline of the body. It involves the clavicle moving anteriorly and forward. For example, when pushing something away from the body.
4. Retraction: This movement refers to the backward movement of the shoulder girdle towards the midline of the body. It involves the clavicle moving posteriorly and backward. For example, when squeezing the shoulder blades together.
5. Rotation: This movement refers to the rotational movement of the shoulder girdle around its longitudinal axis. It allows the clavicle to rotate medially or laterally. For example, when twisting the upper body.
It is important to note that while the SC Joint is the primary pivot point for these movements, other joints such as the Acromioclavicular (AC) Joint and Glenohumeral (shoulder) Joint also contribute to the overall mobility of the shoulder girdle.
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