Sternoclavicular joint

Sternoclavicular Joint

The Sternoclavicular Joint (pronunciation: ster-no-clav-ic-u-lar joint) is a pivotal joint located between the clavicle (collarbone) and the sternum (breastbone).

Etymology

The term "Sternoclavicular" is derived from the Latin words "sternon" meaning chest and "clavicula" meaning little key, referring to the key-like function of the clavicle in connecting the arm to the body.

Anatomy

The Sternoclavicular Joint is the only bony joint that connects the axial and appendicular skeletons. It is a synovial joint, meaning it is filled with synovial fluid which aids in reducing friction between the articular cartilage during movement. The joint is surrounded by a fibrous capsule and is reinforced by the anterior and posterior sternoclavicular ligaments.

Function

The primary function of the Sternoclavicular Joint is to provide mobility and strength to the shoulder, allowing for a wide range of movements. It also serves as a shock absorber during arm movement, reducing the impact on the shoulder girdle.

Related Terms

Articular Cartilage: A smooth, white tissue that covers the ends of bones where they come together to form joints.
Axial Skeleton: The part of the skeleton that consists of the bones of the head and trunk of a vertebrate.
Appendicular Skeleton: The portion of the skeleton of vertebrates consisting of the bones that support the appendages.
Clavicle: Also known as the collarbone, it is a long bone that serves as a strut between the shoulder blade and the sternum or breastbone.
Sternum: Also known as the breastbone, it is a long flat bone located in the center of the chest.
Shoulder Girdle: The set of bones in the shoulder region which connects the arm to the axial skeleton.