Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Urodynamic Studies: Uroflowmetry01:19

Urodynamic Studies: Uroflowmetry

Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
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...
Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration01:29

Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration

The kidneys are vital organs responsible for regulating blood filtration, waste excretion, and fluid balance, all of which are crucial for maintaining homeostasis. Renal physiology examines renal blood flow, glomerular filtration, and urine formation, ensuring the body’s internal environment remains stable.Renal Blood FlowThe kidneys receive about 20-25% of the cardiac output, typically around 1200 mL of blood per minute in an average adult. Blood flows into the kidneys through the renal...
Introduction to Urinary System01:13

Introduction to Urinary System

The urinary system consists of two kidneys, two ureters, the urinary bladder, and the urethra.
The kidneys are bean-shaped organs located in the retroperitoneal space, on either side of the vertebral column, between the T12 and L3 vertebrae. They are partially protected by the rib cage and surrounded by perirenal fat, which provides cushioning. They are responsible for urine formation and play critical roles in regulating blood pressure, electrolyte levels, and hormone production. The ureters...
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...
Anatomy of the Genitourinary System II: Bladder and Urethra01:19

Anatomy of the Genitourinary System II: Bladder and Urethra

The lower urinary system consists of the urinary bladder and urethra, which are essential in storing and expelling urine from the body. Together with the internal and external sphincters, these structures work together to regulate urination effectively.Anatomy of the BladderThe urinary bladder is a muscular, stretchable organ behind the pubic bone and in front of the rectum. In females, the bladder is positioned anterior to the vagina and inferior to the uterus, while in males, it is located...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

[Long-term complications after surgery in early childhood].

Ugeskrift for laeger·2026
Same author

Precision-Cut Bladder Slices: A Novel Model for the Study of Bladder Fibrosis and Potential Anti-Fibrotic Agents.

International journal of urology : official journal of the Japanese Urological Association·2026
Same author

Long-term sexual function, fertility, and quality of life after childhood treatment for posterior urethral valves: a systematic review of clinical outcomes.

The journal of sexual medicine·2026
Same author

Summary of the European Association of Urology/European Society of paediatric urology guidelines on transition in urology.

Journal of pediatric urology·2025
Same author

Response to Commentary on "Update and summary of the EAU/ESPU paediatric guidelines on urinary tract infection in children".

Journal of pediatric urology·2025
Same author

Update and summary of the EAU/ESPU paediatric guidelines on urinary tract infection in children.

Journal of pediatric urology·2025

Related Experiment Video

Updated: Jun 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

Urinary flow patterns in first year of life.

Lars Henning Olsen1, Ingrid Grothe, Yazan F Rawashdeh

  • 1Pediatric Urology and Research Unit, Department of Urology, Aarhus University Hospital-Skejby, Aarhus, Denmark.

The Journal of Urology
|December 22, 2009
PubMed
Summary

Urinary flow dyscoordination persists in male infants beyond the neonatal period, with most cases resolving after one year of age. This study tracked infant urinary flow development and lower urinary tract function.

More Related Videos

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
06:05

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection

Published on: October 12, 2017

Cystometric and External Urethral Sphincter Measurements in Awake Rats with Implanted Catheter and Electrodes Allowing for Repeated Measurements
10:07

Cystometric and External Urethral Sphincter Measurements in Awake Rats with Implanted Catheter and Electrodes Allowing for Repeated Measurements

Published on: January 30, 2018

Related Experiment Videos

Last Updated: Jun 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

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
06:05

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection

Published on: October 12, 2017

Cystometric and External Urethral Sphincter Measurements in Awake Rats with Implanted Catheter and Electrodes Allowing for Repeated Measurements
10:07

Cystometric and External Urethral Sphincter Measurements in Awake Rats with Implanted Catheter and Electrodes Allowing for Repeated Measurements

Published on: January 30, 2018

Area of Science:

  • Pediatric Urology
  • Infant Development
  • Lower Urinary Tract Function

Background:

  • Understanding the natural development of urinary flow in infants is crucial for diagnosing potential lower urinary tract issues.
  • Previous assumptions suggested earlier normalization of urinary function than observed.

Purpose of the Study:

  • To investigate the natural progression of urinary flow and lower urinary tract function in healthy male infants.
  • To compare uroflow parameters in infancy with neonatal assessments.

Main Methods:

  • Utilized custom ultrasound flow probes and flowmeters to record urinary flow in 20 male infants.
  • Analyzed flow curve configuration, maximum flow rate, and voided volume, comparing data to neonatal measurements.
  • Employed statistical analysis including ANOVA and Wilcoxon tests for data comparison.

Main Results:

  • A significant increase in dyscoordinated urinary flow patterns was observed, rising from 34% in neonates to 46% in infants.
  • While voided volume increased significantly with age, maximum flow rate remained relatively stable.
  • Bell-shaped flow curves were present in 32% of patients, with other patterns like interrupted and staccato also noted.

Conclusions:

  • Infant urinary flow dyscoordination is more prevalent than previously thought and does not typically resolve within the first year of life.
  • Normalization of urinary flow is anticipated to occur after the infant reaches one year of age.
  • Findings challenge conventional expectations regarding the timeline of urinary system maturation in male infants.