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abdomen
The abdomen (less formally called the ''belly, stomach, tummy'' or ''midriff'') constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. The region enclosed by the abdomen is termed the abdominal cavity. In arthropods it is the posterior tagma of the body; it follows the thorax or cephalothorax.〔(Abdomen. (n.d.) ). Dictionary.com Unabridged (v 1.1). Accessed: 22 Oct 2007〕〔(Abdomen ). Dictionary.com. The American Heritage Dictionary of the English Language, 4th Edition. Accessed: 22 October 2007〕 The abdomen stretches from the thorax at the thoracic diaphragm to the pelvis at the pelvic brim. The pelvic brim stretches from the lumbosacral joint (the intervertebral disc between L5 and S1) to the pubic symphysis and is the edge of the pelvic inlet. The space above this inlet and under the thoracic diaphragm is termed the abdominal cavity. The boundary of the abdominal cavity is the abdominal wall in the front and the peritoneal surface at the rear.
==Structure==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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