APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Ribs 8–12 are called false ribs (vertebrochondral ribs). The costal cartilages from these ribs do not attach directly to the sternum.

Detailed explanation-2: -The phrase floating rib or vertebral rib (Latin: costae fluctuantes) refers to the two lowermost, the eleventh and twelfth rib pairs; so-called because they are attached only to the vertebrae–and not to the sternum or cartilage of the sternum.

Detailed explanation-3: -Ribs. Each rib is a curved, flattened bone that contributes to the wall of the thorax. The ribs articulate posteriorly with the T1–T12 thoracic vertebrae, and most attach anteriorly via their costal cartilages to the sternum. There are 12 pairs of ribs.

Detailed explanation-4: -The eleventh and twelfth ribs aren’t attached to the costal arch. Since they’re not linked to the sternum, they’re called “floating ribs”. The ribs, sternum and costal cartilages form an expandable container for the lungs and heart.

Detailed explanation-5: -The most superior rib is designated rib 1 and it articulates with the T1 thoracic vertebrae. The rib below that is rib 2, and it connects to the T2 thoracic vertebra, and so on. Ten of the twelve ribs connect to strips of hyaline cartilage on the anterior side of the body.