GROSS ANATOMY

Detailed explanation-1: -The first seven bones are called the true ribs. These bones are connected to the spine (the backbone) in back. In the front, the true ribs are connected directly to the breastbone or sternum by a strips of cartilage called the costal cartilage.

Detailed explanation-2: -True ribs (1–7) attach directly to the sternum via their costal cartilage. The false ribs (8–12) either attach to the sternum indirectly or not at all. Ribs 8–10 have their costal cartilages attached to the cartilage of the next higher rib.

Detailed explanation-3: -Sternochondral, also known as chondrosternal or sternocostal joints, are synovial plane joints that attach the sternum (sterno-) with the costal cartilages (-chondral) of the thorax. The first sternochondral joint is an exception, being considered a primary cartilaginous joint.

Detailed explanation-4: -According to their attachment to the sternum, the ribs are classified into 3 groups: true, false, and floating ribs. The false ribs (8, 9, 10) are the ribs that indirectly articulate with the sternum, as their costal cartilages connect with the seventh costal cartilag by the costochondral joint.