Description
The internal surface (inner surface) of fourth rib is its smooth, concave, inner area. It is one of the two surfaces of the body of the fourth rib, the other being the external surface.
The internal surface of fourth rib consists of the costal groove, which is located on its inferior edge, adjacent to the ribs inferior border. It provides an insertion site for the transversus thoracis muscle, attachment sites for the innermost intercostal muscles, and is covered by endothoracic fascia.
Related parts of the anatomy
