Anatomical variation

Muscles Kopsch gave a detailed listing of muscle variations. These included the absence of muscles; muscles that were doubled; muscles that were divided into two or more parts; an increase or decrease in the origin or insertion of the muscle; and the joining to adjacent organs. The sternalis muscle is a variant that lies in front of the pectoralis major and may show up on a mammogram. Bones Usually there are five lumbar vertebrae but sometimes there are six, and sometimes there are four. Organs The lungs are subject to anatomical variations. ==See also==