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ab·do·men(ab-dō'men, ab'dō-men), [TA] Although the classically correct pronunciation is ab-dō'men, the first syllable is often stressed in the U.S.
See also: abdominal regions.
The region of the body that lies between the thorax and the pelvis, which is separated from the thoracic cavity by the diaphragm and by the plane of the pelvic inlet from the pelvic cavity, and is lined with a serous membrane, the peritoneum; the term abdomen may be used interchangeably with abdominal cavity, which contains the abdominal viscera—stomach, small intestine, colon, rectum, liver, spleen, pancreas, kidneys, appendix, gallbladder, and bladder. The abdomen is enclosed by a wall formed by the abdominal muscles, vertebral column and the ilial bones; it is divided into 9 regions (3 upper—right hypochondriac, epigastric, left hypochondriac; 3 middle—right lateral, umbilical, left lateral; 3 lower—right inguinal, pubic, left inguinal) by 4 imaginary lines projected onto the anterior wall, of which 2 horizontally transect the body—the upper at the level of the cartilages of the 9th ribs, the lower at the iliac crests—and 2 extend vertically on each side of the body from the cartilage of the 8th rib to the centre of the inguinal ligament.
See also: abdominal regions
Synonym(s): venter (1) .
abdomenThe part of the trunk below the chest. The abdominal cavity lies between the DIAPHRAGM, above, and the pelvic floor, below. It contains the LIVER and most of the digestive system, comprising the STOMACH, the DUODENUM, the JEJUNUM, the ILEUM, the CAECUM with the APPENDIX, the COLON, the RECTUM and the ANAL CANAL. Other abdominal organs include the KIDNEYS, the ADRENAL GLANDS, the SPLEEN, the PANCREAS and some large and important blood vessels, such as the AORTA and the inferior VENA CAVA, around which are many chains of LYMPH NODES. The intestines are hung from the back wall of the abdomen by a much-folded membrane, the MESENTERY, and are covered by the OMENTUM. The lower part of the abdomen, the pelvic cavity, contains the BLADDER. In women, the pelvic cavity also contains the womb (UTERUS), the FALLOPIAN TUBES and the OVARIES; in men, the central PROSTATE GLAND and the VAS DEFERENS, on each side. The wall of the abdomen consists of overlapping layers of muscle and sheets of fibrous tissue. The organs and the interior of the walls are covered with PERITONEUM. See also ABDOMINAL REGIONS.
abdomenthat part of the body of vertebrates containing the viscera (i.e. the kidneys, liver, stomach and intestines). In mammals it is separated from the thorax, which contains the heart and lungs, by the diaphragm. In arthropods it is that part of the body directly behind the thorax; in many other invertebrates the abdomen is divided into segments that have a superficial similarity.
Patient discussion about abdomen
Q. Uncomfortable in my left-lower abdomen. But it is not acute or dull pain at all. I'm starting to feel uncomfortable in my lower-left abdomen. I roughly guess it started summer in 2008. Certainly, it's not acute or even dull pain at all. But it makes me very uncomfortable when I sit on the chair. I can feel it by sitting on the chair. Such uncomfortableness seems to reside in somewhere between my left leg and abdomen. It is under my navel, and to the left, extending to the my left flank. Once again, I can sense it by touching something developing (With my fingers, I gently pressed that area and, I realized that there's a difference between pressing on the lower-left abdomen and the lower-right abdomen.) But it is not something swollen, and not a hard thing. I've never had the caecum removed. I'm 40 years old, East asian. I quitted smoking in early 90's. In Octocber, 2008 I found my blood pressure pretty good (I can't remember it, though). My life is quite sedentary (I'm a graduate student.) I guess I spend most of my daily time on the chair. Thanks for any opinion in advance.
Q. I am having a sharp pain in the right side of the lower abdomen on and off. Any danger of losing my baby? Hello, after several years after my marriage I have become pregnant. I am just 7 weeks pregnant and taking utmost care as I have been longing for a baby. However I am having a sharp pain in the right side of the lower abdomen on and off. Will I be in any danger of losing my baby? I have an appointment with my doctor tomorrow to get this issue checked out. In the meantime I have been very worried. Does anyone have any suggestions for me?
we all hope you well, and have a healthy pregnancy
Q. What are the symptoms of Ulcerative Colitis? I am 40 years old and suffer from a lot of stomach aches and diarrhea. Do I have Ulcerative Colitis? What are its symptoms?