Nervus Coccygeus is a medical term that refers to a nerve located in the coccyx region of the human body. This nerve is also known as the coccygeal nerve or the fourth sacral nerve. It is responsible for providing sensation and controlling the muscles around the anus, buttock, and perineum. The coccygeal nerve is often associated with various medical conditions such as coccydynia, a type of pain that occurs in the tailbone region. Synonyms for this nerve include the dorsal nerve of the penis or clitoris in males and females, respectively. It is also called the pudendal nerve because it distributes the branches to the sexual organs.