The term perineum refers to the anatomical region between the anus and genitals. It can refer to the surface area or the muscles and fascia below.
The perineum is below the pelvic diaphragm and between the legs. It is a diamond-shaped area that includes the anus and, in females, the vagina. Its definition varies: it can refer to only the superficial structures in this region, or it can be used to include both superficial and deep structures. The perineum corresponds to the outlet of the pelvis.
OpenStax, Anatomy & Physiology. OpenStax. 25 April 2013.
Perineum. (2016, October 8). In Wikipedia, The Free Encyclopedia. Retrieved 06:53, October 8, 2016, from https://en.wikipedia.org/w/index.php?title=Perineum&oldid=743161594