In human and other animal bodies, the torso refers to the central mass of the body excluding the arms, legs and neck and head. The chest and abdomen, naturally divided internally, form the two parts of the torso.
Most of the body's essential organs are tightly grouped together and protected within the torso. The heart and lungs are contained within the chest. The digestive and waste removal organs, including the stomach, liver, colon, gall bladder, kidney and intestines, are contained within the abdomen. The organs of the chest and the organs of the abdomen are separated by a muscle known as the diaphragm.