Portion of the body that lies between the thorax and the pelvis.

Subdivision of front of trunk, each instance of which has as its constitutional part some complete set of lumbar vertebral arches (L1-L5); it is demarcated from the abdomen internally by the superior surface of the diaphragm and externally by the costal margin and from the pelvis by the plane of the superior pelvic aperture; together with the abdomen and pelvis constitutes the trunk. Examples: There is only one abdomen.

Subdivision of trunk, which is demarcated from the thorax internally by the inferior surface of the sternocostal part of the diaphragm and externally by the costal margin, from the pelvis by the plane of the superior pelvic aperture and from the lower limbs by the inguinal folds; together with the thorax, pelvis, and perineum, it constitutes the trunk. Examples: There is only one abdomen.

That portion of the body that lies between the THORAX and the PELVIS.

Abdomen, in human anatomy, the body cavity lying between the chest or thorax above and the pelvis below and from the spine in the back to the wall of abdominal muscles in the front. The diaphragm is its upper boundary. There is no wall or clear-cut boundary between it and the pelvis. It contains...