detrusormuskulatur

Detrusormuskulatur, also known as the detrusor muscle, is the smooth muscle layer of the urinary bladder responsible for its contraction during urination. It is situated within the wall of the bladder, forming the majority of its muscular structure. The primary function of the detrusor muscle is to facilitate the expulsion of urine by contracting in response to nerve signals, thereby increasing pressure within the bladder.

Anatomically, the detrusor muscle consists of three interconnected layers of smooth muscle fibers: an inner longitudinal layer, a middle circular layer, and an outer longitudinal layer. This arrangement allows for coordinated contractions that efficiently empty the bladder during micturition. The detrusor is innervated predominantly by the parasympathetic nervous system through pelvic nerves, which stimulate contraction. Sympathetic nerves, via the hypogastric plexus, generally promote relaxation of the detrusor muscle, aiding bladder storage.

The regulation of detrusor activity is critical for normal urinary function. Detrusor overactivity can lead to conditions such as urgency urinary incontinence, while underactivity may result in urinary retention. Pathological changes in the detrusor muscle, such as hypertrophy, fibrosis, or nerve degeneration, can be associated with various urological disorders.

Understanding the structure and function of the detrusor muscle is essential for diagnosing and treating urinary bladder dysfunctions. Treatments may involve pharmacological agents targeting bladder overactivity, neuromodulation, or surgical interventions, depending on the underlying condition.