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Urinary Bladder

Urinary Bladder

The urinary bladder is a hollow, muscular sac that temporarily stores urine before it is expelled from the body. It can hold approximately 600 mL of urine prior to micturition. The bladder is retroperitoneal and located behind the pubic symphysis in the pelvic floor.
In males, the bladder is situated in front of the rectum, while in females, it is positioned anterior to the vagina and uterus. The bladder floor contains an inverted triangular area called the trigone, defined by the two ureteric...

Anatomy of the Genitourinary System II: Bladder and Urethra

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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...

Ureters

Ureters

The ureters are retroperitoneal tubes located on either side of the vertebral column. They are responsible for transporting urine from each kidney to the urinary bladder. These tubes have thick walls and are approximately 25-30 cm long. Their diameter is around 10 mm at the renal pelvis, gradually narrowing to 1 mm as the ureter obliquely enters the posterior bladder wall through the ureteric orifices. The shape of these orifices is slit-like, which helps to prevent urine backflow toward the...

Microbiota of the Urogenital Tract

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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...

External Anatomy of the Kidney

External Anatomy of the Kidney

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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...

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Related Experiment Video

Updated: Jul 15, 2026

Magnetic Resonance Imaging Assessment of Carcinogen-induced Murine Bladder Tumors

Magnetic Resonance Imaging Assessment of Carcinogen-induced Murine Bladder Tumors

Published on: March 29, 2019

Bladder wall thickness in healthy school-aged children.

Nihat Uluocak¹, Fikret Erdemir, Bekir Suha Parlaktas

¹Department of Urology, Gaziosmanpasa University School of Medicine, Tokat, Turkey.

|April 21, 2007

Summary

Transabdominal ultrasonography effectively measures bladder volume and detrusor muscle thickness in children. Anterior and posterior wall thicknesses correlate significantly with age and body mass index.

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Last Updated: Jul 15, 2026

Magnetic Resonance Imaging Assessment of Carcinogen-induced Murine Bladder Tumors

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Published on: March 29, 2019

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing

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Published on: August 14, 2019

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

Published on: June 21, 2024

Area of Science:

Pediatric Urology
Diagnostic Imaging
Anatomy

Background:

Bladder volume and detrusor muscle thickness are key indicators of bladder function.
Accurate measurement techniques are essential for pediatric urological assessment.

Purpose of the Study:

To assess the efficacy of transabdominal ultrasonography in measuring pediatric bladder volume and detrusor muscle thickness.
To investigate the correlation of these measurements with age, height, and body mass index (BMI) in children.

Main Methods:

A retrospective review of 244 healthy school-aged children was conducted.
Transabdominal ultrasonography was used to measure anterior, posterior, and lateral bladder wall (detrusor) thicknesses.
Age, height, and BMI were recorded for all participants.

Main Results:

Bladder volume showed a significant positive correlation with age (P = 0.0001).
Anterior and posterior detrusor wall thicknesses demonstrated significant positive correlations with both age (P <0.05) and BMI (P = 0.0001 and P = 0.001, respectively).
Lateral detrusor wall thickness did not show significant correlations with age or BMI.

Conclusions:

Transabdominal ultrasonography is effective for evaluating bladder volume and detrusor muscle thickness in children.
Anterior and posterior detrusor wall thickness measurements are significantly influenced by age and BMI in this pediatric cohort.