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Related Concept Videos

Disorders of the Urinary System01:20

Disorders of the Urinary System

The urinary system is responsible for eliminating waste and excess fluids from the body. However, disorders of the urinary system can arise due to various reasons like infections, stress, age, congenital abnormalities, and lifestyle.
Urinary tract infections (UTIs) are one of the most common urinary system disorders. They are caused by bacteria that enter the urethra and can spread to the bladder resulting in cystitis. Pyelonephritis is the result of a UTI that has ascended to the level of the...
Physiology of Urine Formation01:24

Physiology of Urine Formation

Urine formation is an essential function of the human body. It plays a critical role in maintaining homeostasis by regulating the volume and composition of body fluids. The kidneys, the primary organs involved in this process, filter blood to remove waste products and excess substances, ultimately producing urine.
Glomerular Filtration
The first stage in urine formation is glomerular filtration. Each kidney contains approximately 1 million nephrons, the functional units of filtration, with a...
Microbiota of the Urogenital Tract01:28

Microbiota of the Urogenital Tract

The human urogenital system, once thought to be sterile in healthy individuals, is now recognized as a complex microbial habitat. Advancements in molecular sequencing techniques have revealed that even in healthy adults, the kidneys and bladder harbor microbial populations similar to those found in the distal urethra, albeit in much lower abundance. These resident microorganisms, while generally innocuous, can become opportunistic pathogens under conditions that alter the urogenital...
The Micturition Reflex01:26

The Micturition Reflex

Urination, or micturition involves the coordination of the bladder's detrusor muscle and two sphincters to ensure controlled bladder emptying.
The process begins with bladder filling, where the bladder wall stretches as urine accumulates. This stretching activates the urine storage reflex, mediated by the sacral spinal segments and the pontine storage center. Efferent sympathetic impulses stimulate the detrusor muscle to relax and the internal urethral sphincter to contract, facilitating urine...
Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations01:26

Urinary Tract Calculi II: Pathophysiology and Clinical Manifestations

Renal calculi, commonly termed kidney stones, are crystalline solid masses that form in the kidneys but can occur at any point within the urinary system, encompassing the kidneys, ureters, bladder, and urethra.The pathophysiology of renal stones involves several key factors: supersaturation of the urine with stone-forming constituents, changes in urine pH, a decrease in urine volume, and the presence of substances that promote or inhibit stone formation.Supersaturation of Urine: This is the...
Urinary Tract Infection II: Pathophysiology01:25

Urinary Tract Infection II: Pathophysiology

The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...

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Updated: May 17, 2026

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing
05:25

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing

Published on: August 14, 2019

Lower urinary tract function in childhood; normal development and common functional disturbances.

T Nevéus1, U Sillén

  • 1Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden. tryggve.neveus@kbh.uu.se

Acta Physiologica (Oxford, England)
|October 24, 2012
PubMed
Summary
This summary is machine-generated.

Childhood bladder dysfunction, including daytime incontinence and nocturnal enuresis, affects 5-10% of children. These conditions, often due to detrusor overactivity or dyscoordination, can persist into adulthood.

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Area of Science:

  • Urology
  • Pediatric Urology
  • Developmental Biology

Background:

  • Bladder development initiates early in gestation (weeks 4-6), with detrusor muscle formation by weeks 9-12.
  • Infants possess higher central nervous system (CNS) centers involved in micturition at birth.
  • Early childhood voiding may be incomplete due to detrusor-sphincter dyscoordination, resolving with bladder control attainment.

Purpose of the Study:

  • To offer background knowledge on early bladder function development.
  • To detail common childhood bladder disturbances.
  • To inform researchers and clinicians managing adult lower urinary tract issues.

Main Methods:

  • Literature review of bladder development and childhood voiding disturbances.
  • Synthesis of information on the etiology of daytime incontinence and nocturnal enuresis.
  • Analysis of the long-term implications of pediatric bladder problems.

Main Results:

  • Detrusor-sphincter dyscoordination is common in early childhood voiding.
  • Daytime incontinence (5-10% of 7-year-olds) is often linked to detrusor overactivity.
  • Nocturnal enuresis results from nocturnal polyuria and/or detrusor overactivity with high arousal thresholds.

Conclusions:

  • Childhood bladder problems are significant risk factors for adult lower urinary tract dysfunction.
  • Understanding pediatric bladder development is crucial for managing adult conditions.
  • Detrusor overactivity and high arousal thresholds are key factors in childhood incontinence and enuresis.