Ribs

Ribs

*Twelve pairs of ribs (24 bones total)
*Attach posteriorly to the thoracic vertebrae
*Curve inferiorly towards the anterior
*7pairs-True ribs
*5 pairs-false ribs
*1-7 increase in length
*8-12 decrease in length

Vertebrosternal ribs

*True ribs
*7 pairs- superior ribs
*attach directly to the sternum

Vertebrochondral ribs

*False ribs
*8-10 attach indirectly to the sternum
*Through rib 7

Vertebral ribs

*False/Floating ribs
*Have no anterior attachments
*Their costal cartilage attaches to the muscles of the lateral body wall.

Typical rib bone?

*Flat and bowed.
*Superior border is smooth
*Inferior borders have a costal groove for intercostals nerves and blood vessels.

Head of the rib?

*At the posterior end
*Articulates with two vertebral bodies
*one at the body of the same number and one at the superior body.

Neck of the rib?

Thin portion just before the head.

Tubercle of the rib?

*Knoblike, just below the head
*Articulates with the transverse process of the same numbered vertebrae.

First pair of the rib?

*Differs from the others.
*Flattened from the superior to inferior aspect and more broad.
*Rib 1 and ribs 10-12 articulate with only one vertebral body and ribs
*11 and 12 do not articulate with a transverse process.