[AS.] The material part of a living being. In the higher animals it is composed of a head, a central part or trunk, and four limbs. When the human body is dissected, or taken to pieces, there is found a hard part or skeleton, composed of about 240 bones; upon these bones lie masses of red flesh (muscles), by which the bones are moved; on the outside of all is a covering called the skin. The limbs are solid, but the trunk and head are hollow, containing certain organs, each of which has its allotted duty or function to perform so long as the body retains life. The muscles are called the organs of locomotion, because it is by their aid that we move about from place to place. The chief organ in the head is the brain, contained in the bony box called the skull. The trunk is divided, horizontally, into an upper portion (called the chest) and a lower portion (known as the abdomen). The organs within the chest are the heart and the lungs. In the abdomen are situated the stomach, the intestines, the liver, the pancreas, the spleen, and the kidneys.