Definition: A vesicant, or vesical, is a type of organ that can be found in the brain. Vesicles are tiny spaces between neurons and are important for communication between cells. The term "vesicant" refers to the absence of these spaces, which allow neural signals to pass through. Vesical function is crucial for proper functioning of the central nervous system (CNS). It helps regulate body temperature by regulating blood flow in the brain, as well as controlling various bodily functions such