Musculus detrusor urinae, commonly referred to as the detrusor muscle, is an important component of the urinary bladder found in mammals, including humans. It is a smooth muscle responsible for regulating and controlling the process of urination.
The detrusor muscle is located within the wall of the urinary bladder, encompassing the entire organ. It consists of interlacing fibers that contract and relax to facilitate the emptying of the bladder during micturition (urination). These fibers are primarily composed of smooth muscle cells, which have a distinct non-striated appearance.
The main function of the musculus detrusor urinae is to exert force on the urinary bladder walls, aiding in the expulsion of urine. When stimulated, it undergoes rhythmic contractions that help to propel urine through the urethra and out of the body. These contractions are controlled by the parasympathetic nervous system, which releases the neurotransmitter acetylcholine to facilitate muscle contraction.
Disorders or abnormalities in the musculus detrusor urinae can lead to various urinary dysfunctions. Conditions like overactive bladder, urinary incontinence, or urinary retention can result from problems with the detrusor muscle's ability to contract or relax appropriately. Treatments for these conditions often involve the use of medications, physical therapy, or surgical interventions to restore proper detrusor muscle function.
In summary, the musculus detrusor urinae is the smooth muscle responsible for the contraction and relaxation of the urinary bladder during urination. Its proper function is crucial for the normal control and regulation of the urinary system.
