Bladder outlet physiology in the context of lower urinary tract dysfunction

Area of Science:

• Urology
• Physiology
• Neuroscience

Background:

• The bladder outlet's physiological function is intricate, involving smooth and skeletal muscles, interstitial cells, and neuroendocrine cells.
• Outlet dysfunction can lead to various symptomatic consequences and complex conditions.
• Innervation involves multiple transmitters, suggesting potential for unrecognized functional subtleties.

Purpose of the Study:

• To explore the complex physiological functions of the bladder outlet.
• To highlight the roles of different cell types and nervous systems in bladder outlet control.
• To identify research priorities for understanding bladder outlet physiology and dysfunction.

Main Methods:

• Review of existing literature on bladder outlet physiology and dysfunction.
• Analysis of the roles of smooth muscle, skeletal muscle, interstitial cells, and neuroendocrine cells.
• Examination of neural control mechanisms involving spinal and central nervous system (CNS) centers.

Main Results:

• Key bladder outlet functions include urine storage, guarding during exertion, voiding, territorial marking, and ejaculation.
• Coordination involves somatic, sympathetic, and parasympathetic nervous systems, with shared afferents with the anal sphincter.
• Dysfunction can cause retrograde ejaculation, Fowler's syndrome, and detrusor sphincter dyssynergia.

Conclusions:

• Understanding the bladder outlet's complex cellular and neural integrative physiology is crucial.
• Further research into peripheral and central interactions is needed to address outlet dysfunction.
• Standardized animal models are essential for advancing knowledge of bladder outlet functions.