The torso, also known as the trunk, is the central part of the body of many animals, including humans, from which the head, neck, limbs, tail, and other appendages extend. In humans, the torso is divided into three segments: the thoracic segment (upper torso), the abdominal segment (mid-section or midriff), and the pelvic and perineal segments (lower torso) . The torsos main function is to protect the internal organs, such as the heart, lungs, liver, stomach, and intestines, which are housed within it. The torso also contains many of the main groups of muscles in the body, including the pectoral, abdominal, lateral, and epaxial muscles. The organs, muscles, and other contents of the torso are supplied by nerves, which mainly originate as nerve roots from the thoracic and lumbar parts of the spinal cord. A statue of a torso in a museum, usually ancient Greek or Roman, is that of the trunk of a human body, often carved from marble, and is so old that it has frequently lost its arms and head.