The abdomen constitutes the part of the body between the thorax and pelvis, in humans and in other vertebrates. The abdomen is the frontal part of the abdominal segment of the trunk, the dorsal part of this segment being the back …
The human abdomen and organs which can be found beneath the surface
Side-by-side comparison of 4- and 9-region schemes.
The analogous gross morphologies of a human and an ant
Image: Example of a physically fit human male abdomen