Viscus refers to the internal organs of the chest and abdomen, including the heart, lungs, liver, pancreas, and intestines. These organs play crucial roles in maintaining our bodily functions and keeping us alive. The viscera of the thoracic cavity (heart and lungs) are protected by the rib cage, while those in the abdomen are protected by the abdominal muscles.
Viscera - Internal organs of the body within the chest (as the heart or lungs), and/or abdomen (as the liver, pancreas, or intestines). For example in the image, the viscera of the thoracic cavity (heart and lungs) are protected by the rib cage.
Image: Blausen.com staff (2014).