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.
Vagus Nerve. The vagus nerve is the tenth cranial nerve (CN X) and is responsible for parasymapthetic nerve supply to the stomach. It enters the abdomen through the esophageal hiatus in the diaphragm. The anterior vagal trunk supplies the anterior aspect (front) of the stomach and is derived from the left vagus nerve. The posterior vagal trunk supplies the posterior aspect (back) of the stomach and to a lesser extent the anterior aspect of the stomach and is derived from the right vagus nerve.