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.
Ulnar nerve. The ulnar nerve is a nerve that travels from the wrist to the shoulder. This nerve is mainly responsible for movement of the hand; despite passing through the forearm, it is only responsible for one and a half muscles there.Its primary role is to provide nerve function to the hand.his means that general damage to the arm or elbow can cause damage to the ulnar nerve. The ulnar nerve is responsible for the pain, or 'funny bone', sensation that occurs if the elbow bone is suddenly struck. Continual pressure on the elbow or inner forearm may cause damage.