Reactants and Products in Chemical Reactions. In a chemical reaction, substances (elements and/or compounds) called reactants are changed into other substances (compounds and/or elements) called products. You canât change one element into another in a chemical reaction â that happens in nuclear reactions.
The pudendal nerve is the main nerve of the perineum. It carries sensation from the external genitalia of both sexes and the skin around the anus and perineum, as well the motor supply to various pelvic muscles, including the male or female external urethral sphincter and the external anal sphincter.he pudendal nerve passes between the piriformis muscle and coccygeus (ischiococcygeus) muscles and leaves the pelvis through the lower part of the greater sciatic foramen. It crosses over the lateral part of the sacrospinous ligament and reenters the pelvis through the lesser sciatic foramen.
Pudendal neuralgia was first described in 1987 by Amarenco et al. It is a severely painful and disabling neuropathic condition, affecting both men and women, involving the dermatome of the pudendal nerve. This leads to pain in the clitoris/penis, vulva/scrotum, perineum, and rectum, especially when sitting.udendal neuralgia is described as a neuropathic pain in the distribution of the pudendal nerve. Pain may be present along the entire dermatome, or may be restricted to sites innervated by the nerveâs branches (Fig. 1).