Positions of the internal organs. Artwork taken from a textbook by Joseph Maclise (ca. 1815-1880_, a British surgeon. The positions of the internal organs have been superimposed upon a male torso. In the chest or thorax, the heart (centre, with chambers shown) is enclosed on either side by the lungs. Separating the thorax from the abdomen below is the diaphragm. Beneath is the liver (left), stomach (right), intestines (lower centre) and bladder (bottom).