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abdomen

abdomen
1. In vertebrates, the region of the body that contains the internal organs other than the heart and lungs. In Mammalia it is bounded anteriorly by the diaphragm .

2. In most arthropods , the hind region (tagma) of the body, which contains most of the digestive tract, the gonads, and the genital openings. In Crustacea , the abdomen bears limbs which are to a greater or lesser extent segmentally arranged and the abdomen is not homologous with that of arachnids and insects . The abdomen usually shows at least some trace of segmentation, ...

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