0 between the ribs (= curved bones in the chest) and the sternum (= the main bone in the chest):
sternocostal joints
Deficiency or absence of the sternocostal part is not uncommon.
The anterior longitudinal sulcus is situated on the sternocostal surface of the heart, close to its left margin.
An example of a synchondrosis joint is the first sternocostal joint (where the first rib meets the sternum).
The sternocostal part is antagonistic to the clavicular part contributing to downward and forward movement of the arm and inward rotation when accompanied by adduction.
The rest of the sternocostal joints are synovial plane joints.
