Rib Anatomy Numbers

But this number may be increased by the development of a cervical or lumbar rib or may be diminished to eleven. Ribs 2 through 10 have two.

The Ribs

Atypical ribs rib 1 is unusually short and wide and has only one articular facet head for attachment to the spinal column.

Rib anatomy numbers. Each are symmetrically paired on a right and left side. Ribs are classed as flat bones which usually have a protective role in the body. The first seven are connected behind with the vertebral column and in front through the intervention of the costal cartilages with the sternum fig.

Anatomists have numbered the ribs from top to bottom and different pairs have additional features that allow you to distinguish them from one another. Humans have 24 ribs in 12 pairs. Normally there are 12 pairs of ribs but incidence of accessory cervical or lumbar rib may grow them to 13 pairs or absence of 12th rib may reduce them to 11 pairs.

Arrangement and general outline the ribs are arranged 1 below the other and the gaps between the adjacent ribs are termed intercostals spaces. The first rib is attached to thoracic vertebra 1 t1. The human rib cage is made up of 12 paired rib bones.

They are called true or vertebro sternal ribs. The number of ribs as 24 12 pairs was noted by the flemish anatomist vesalius in his key work of anatomy de humani corporis fabrica in 1543 setting off a wave of controversy as it was traditionally assumed from the biblical story of adam and eve that mens ribs would number one fewer than womens. Of all 24 ribs the first seven pairs are often labeled as true.

Human anatomy rib details. All are attached at the back to the thoracic vertebrae and are numbered from 112 according to the vertebrae they attach to. They are twelve in number on either side.

Sternum Wikipedia