Detrusor muscle

Definition

The detrusor muscle is a smooth muscle layer that forms the wall of the bladder, responsible for contracting to expel urine during urination. It relaxes to allow the bladder to store urine and contracts during urination to release it.

Related terms

Bladder: A hollow muscular organ that stores urine produced by the kidneys before it is discharged from the body.

Urethra: The tube that connects the urinary bladder to the urinary meatus for the removal of fluids from the body.

Micturition: The process of urination, involving both voluntary and involuntary contractions of muscles including the detrusor muscle