The area around the anus.

Related to the perineum.

The area between the anus and the sex organs

A wavelike movement of muscles in the gastrointestinal (GI) tract. Peristalsis moves food and liquid through the GI tract.

The lining of the abdominal cavity.

An infection of the peritoneum.

Anemia caused by a lack of vitamin B12. The body needs B12 to make red blood cells and nerve cells.

The space behind the mouth that serves as a passage for food from the mouth to the esophagus and for air from the nose and mouth to the larynx, or voice box.

The observable traits or characteristics of an organism, for example hair color, weight, or the presence or absence of a disease. Phenotypic traits are not necessarily genetic

High blood pressure in the portal vein. This vein carries blood into the liver. Portal hypertension is a common complication of cirrhosis and may cause esophageal varices and ascites.