Xyphoid process: Encyclopedia - Xyphoid process

Xyphoid process

The xiphoid process is a small cartilaginous extension to the lower part of the sternum which is usually ossified in the adult human. By age 25 to 29, the xiphoid usually fuses to the body of the sternum with a fibrous joint. Unlike the synovial articulation of major joints, this is non movable. Much the way the first seven ribs articulate with the sternum, the cartilage in the solar plexus joins on the xiphoid process, reinforcing it, and indirectly attaching the costal cartilage to the sternum.

The xiphoid process can be bifurcated, and sometimes perforated, naturally. These variances in morphology are inheritable, which can help group family members together when dealing with burial remains. These morphological differences pose no health risk, and are simply a difference in form.

Pressure on the xiphoid process should be avoided when administering chest compressions in CPR.

In the birds, the xiphoid process is a long structure, often following the direction of the carina.

The word derives from the Greek word xiphos for straight sword, the tip of which the process somewhat resembles.

Adapted from the Wikipedia article "Xyphoid process", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki