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Human Abdomen Source Wikimedia Commons Abdomen - (Abdomen area between the pelvis and chest) The Abdomen is: The body region located between the top of the pelvis and lower chest, animals both vertebrate and invertebrate animals. In vertebrates like mammals, also known as the Abdomen (belly) constitutes the part of the body between the thorax (chest) and pelvis (cavity genitourinary). The region enclosed by the Abdomen called the abdominal cavity. In arthropods is the distal part of the body behind the thorax or cephalothorax. The human Abdomen is also called (womb) is part of the body between the pelvis and chest. Anatomically known as abdominal area supported by a series of ligaments, muscles and skin on the back protected by tendons, nerves and bones. The Abdomen extends from the thorax at the thoracic diaphragm to the pelvis on the iliac crest. The iliac crest extends from the lumbosacral angle (the intervertebral disk between L5 and S1) to the symphysis pub...