Acromioclavicular joint

Definition

The acromioclavicular joint is a joint at the top of the shoulder that connects the acromion (a bony projection off the scapula) and the clavicle (collarbone). It allows for the wide range of motion of the shoulder.

Related terms

Scapula:

The flat triangular bone on the back of the shoulder girdle known as the shoulder blade.

Clavicle:

A long bone that serves as a strut between the shoulder blade and the sternum or breastbone; commonly known as the collarbone.

Glenohumeral Joint:

The ball-and-socket joint between the head of the humerus (upper arm bone) and the glenoid fossa of the scapula, allowing rotational movement of the arm