What exactly is the abdomen?
604359
The easiest way to understand is to consider the part at the belly button.  It is our stomach and our intestines.  A lot of times, though, we simply think of this as our stomach.
751963
In adults, probably the thymus.\nThe Appendix is an organ, perhaps that.
800331
Do you not mean spleen i don't know what a spline is but the human spleen is located in the upper left part of the abdomen, behind the stomach and just below the diaphragm. The spleen is a ductless, vertebrate gland that is closely associated with the circulatory system, where it functions in the destruction of old red blood cells in holding a reservoir of blood. It is regarded as one of the centres of activity of the reticuloendothelial system. Until recently, the purpose of the spleen was not known. It is increasingly recognized that its absence leads to a predisposition to certain infections.
584103
Mesenteric fat (also referred to as omental or intraperitoneal fat).  People with beer bellies often have a large amount of subcutaneous fat also--that's the jiggly stuff on the outside--but if you examine them carefully, the muscular wall of their abdomen is actually distended.  I've also seen people with beer bellies who did not have much subcutaneous fat--their abdomen was distended, but not jiggly.
536387
The gall bladder is a balloon-like sac that connects to the liver and the top of the small intestines. It stores bile, a green substance produced by the liver. Bile assists in the digestion of fats.
449077
We don't. \n\nThe body usually finds stuff to fill up the space with. In the abdomen (peritoneal cavity), the guts just slither around into the space formerly occupied by, say, the spleen. The kidneys are in the retroperitoneal space and if you take one out the space just heals together. If you take out the uterus (which is pretty small anyway), the bladder has a bit more room.\n\nI work in the brain. If you take out a large chunk (e.g. for tumor, epilepsy surgery, or after traumatic injury) there is a space left. We fill it up with sterile saline at operation as best we can, though there's always a bit of air left (because of gravity and water level), but over the next day or so the body replaces it with the normal cerebrospinal fluid anyway. You can image these people later, and it's just a big fluid space there.
1174367
It's generally considered the skin.  The largest internal organ is the liver.
617593
The gallbladder is a small, highly expandable sack located in between the lobes of the liver. The liver creates bile for digestion constantly, with no way to control when you need it. Therefore, it stores it into the gallbladder, where it stays until you eat fatty foods. When this happens, a hormone is released that tells your gallbladder to contract, and then it squeezes the bile into the digestive tract to breakdown the fats you have just eaten.\n\nMany people have their gallbladder removed everyday. When that happens, the bile just constantly dumps into your digestive tract, which is not a problem.
93399
it is the front part of the Acetabulum.....\nokay, it is a part of the Pelvis ;-)
125040
where is the body? i have no idea it is just a guess.
539028
A hernia is an opening or weakness in the muscular structure of the wall of the abdomen that causes a bulging of the abdominal wall.\n\nMost hernias are visually detected (exception is a hiatal hernia).\n\nSurgery is required to repair the hernia.\n\nFYI: there are many different types of hernia so more info can be provided based on the type of hernia.
608017
In your left stomach? How many stomachs do you have? Are you a cow?
963103
It is called umbilical hernia . It can contain fat or part of the small intestine itself . Needs to be fixed surgically or it ll grow big. Stop power lifting , do cardios. Also wear an abdominal support belt.
321646
It isn't really your stomach. It is gasses moving in your small intestine.
577794
Painless, The tech will put a gel like substance on your abdomen, then rub a monitor over your abdomen.  The gel is a little cold sometimes, but that is the extent of it.  Tech will wipe the gel off and you are done.
361716
In biology, the term you are looking for, I believe, is coelem. Most animals have a "true body cavity", the coelem. This is where the internal organs are located.
319662
Inside the body, the liver.\n\nSome would say in general it's the skin (which is made of several tissues).