Detrusor is a term used to describe the smooth muscle in the wall of the bladder that helps to facilitate the process of urination. There are several synonyms that can be used instead of this term, including the words vesical muscle, bladder muscle, and urinary muscle. These synonyms are often used interchangeably, depending on the context in which they are being used. The detrusor muscle is an important component of the urinary system, and its contraction is controlled by the autonomic nervous system. When the muscle contracts, it helps to expel urine from the bladder through the urethra, allowing the body to eliminate waste products.