ABDOMEN. The trunk of the human body is divided by the diaphragm into two cavities—the upper being the thorax or chest, and the under, the abdomen or belly. Both the cavity ss . - -- .--..
in and the viscera it contains are included in the ' 44f-'"7, 9 --, ''''- I e4 .
term A. It contains the liver, pancreas, spleen, / 7.'1'.
/:...,- ; -, ",* • :' *EI and kidneys, as well as the stomach, small intestine, I t .;;-''-' lurty t t _' ' and the colon. The lower bowel, the bladder, and -.5.4.— ,-•----,.: " 6.'''' ' I ' internal organs ofgeneration lie in the lowest part - "s 'Of :, .4' of the cavity, which is called the pelvis. The A.
is lined by a serous membrane, the peritoneum, 610144Vi ' .
which is folded over the viscera, allowing them a it certain freedom of motion, but keeping. them in their proper rehitions to each other. The A. is 41 divided externally by two horizontal lines into 12— ...:,. "Iil three principal upper or epigmstric, • '''- the middle or umbilical, and the lower or hypogas •tric. These are again subdivided by two vertical lines—the side-divisions being called the hypochon driac, lumbar, and iliac regions respectively; the ORGANS OF THE ABDOMEN.
names epigastric and umbilical are then applied in 1. Diaphragm. 2. Gall-bladder. 3. Py
a restricted sense to the middle divisions of the two Torte end of Stomach. 4. Right lobe of u Liver. 8.6.riGeieveatofend Caul end pper principal regions; while the middle division of the lower is called the region of the pubis. Dis- or Omentum. ti. Pancreas (Sweetbreads eases of the abdominal viscera are frequent, and W. Small intestine Oeilinum\. it. Great chiefly consist either of chronic disorders of the (Colon% 12. Small Intestine digestive organs, or of derangements of the ner•e plexuses and ganglia there situated. These disorders announce themselves partly in bodily pain, and partly in mental affections, such as hypochondria and hysterics.
AnDo3tEs, in Entomology, the last of the three parts into which the body of an insect is divided. It is composed of a number of rings or segments, frequently nine, more or less distinct from each other. It contains a portion of the intestines and the sexual organs. In the perfect insect, its segments bear no legs nor wings; but the hind legs of larvm or caterpillars, which afterwards disappear, are attached to them. In many insects, its last segments bear appendages of various uses and forms, as pincers, stings, borers or of ovipositors, etc. '