Deficiency or absence of the sternocostal part is not uncommon.

An example is the sternocostal joint.

The anterior longitudinal sulcus is situated on the sternocostal surface of the heart, close to its left margin.

Also known as sternocostal hiatus or (Larrey's) triangle.

(The rest of the sternocostal joints are synovial plane joints.)

The sternocostal surface of the heart (anterior surface of the heart) is directed forward, upward, and to the left.

Its anterosuperior surface is rounded and convex, and forms the larger part of the sternocostal surface of the heart.

An example of a synchondrosis joint is the first sternocostal joint (where the first rib meets the sternum).

Foramina of Morgagni (sternocostal triangle)

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 Interarticular sternocostal ligament is a horizontal fibrocartilaginous plate in the center of the second sternocostal joint.

The Radiate sternocostal ligaments are fibrous bands that cross from the sternal end of the costal cartilage to the ventral part of the sternum.

It forms a small part of the sternocostal surface and a considerable part of the diaphragmatic surface of the heart; it also forms the apex of the heart.

The sternocostal triangle or foramina of Morgagni (sing.: foramen of Morgagni) are small zones lying between the costal and sternal attachments of the thoracic diaphragm.

Other characteristics of this disease are "unilateral shortening of the index, long, and ring fingers, syndactyly of the affected digits, hypoplasia of the hand, and the absence of the sternocostal portion of the ipsilateral pectoralis major muscle".

The sternocostal articulations (costosternal articulations), articulations of the cartilages of the true ribs with the sternum are arthrodial joints, with the exception of the first, in which the cartilage is directly united with the sternum, and which is, therefore, a synarthrodial articulation.