The abdomen is a part of the body. In humans, and in many other vertebrates, it is the region between the thorax and the pelvis (Separating the thorasic cavity and the abdominal cavity is the diaphragm). In fully developed insects, the abdomen is the third (or posterior) segment, after the head and thorax.
The abdomen also contains some of the largest and most easily accessible blood vessels in many animals, and is often used in medicine and experimentation for catheterisation.
More on [ Abdomen ]

Chronic Abdominal Pain in Childhood: Diagnosis and Management April 1, 1999 - American Academy of Family Physicians - This site contains the full text of a clinical study compiled by the John Hopkins University School of Medicine and published in the April 1, 1999, issue of American Family Physician.
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