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Micturition: Definition, Process & Disorders

Micturition refers to the process of emptying the urinary bladder, commonly known as urination. It is a complex physiological process controlled by the nervous system.

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Things worth knowing about "Micturition"

Micturition refers to the process of emptying the urinary bladder, commonly known as urination. It is a complex physiological process controlled by the nervous system.

What is Micturition?

Micturition (from Latin mictio) is the medical term for the voluntary emptying of the urinary bladder, commonly known as urination. It is a complex physiological process involving both voluntary and involuntary nerve mechanisms, occurring multiple times throughout the day in healthy individuals.

Physiology of Micturition

The process of micturition can be divided into two main phases:

Storage phase: The bladder fills with urine. The detrusor muscle (the bladder wall muscle) relaxes while the urethral sphincter remains contracted, keeping the urine inside. The first urge to urinate typically occurs when the bladder contains approximately 150–300 ml of urine.
Voiding phase: When voluntary control is exercised, the detrusor muscle contracts, the sphincter relaxes, and urine is expelled through the urethra.

This process is regulated by a complex interplay between the autonomic (involuntary) nervous system, the somatic (voluntary) nervous system, and higher brain centers that allow conscious control over urination.

Normal Micturition Frequency

Healthy adults typically urinate 4–8 times per day. Several factors influence voiding frequency:

Fluid intake and diet
Physical activity
Ambient temperature
Age and sex
Underlying medical conditions

Disorders of Micturition

Micturition disorders are common and may indicate various underlying conditions. Key disorders include:

Pollakiuria (Increased Frequency)

Frequent urination without an increase in total urine volume, typically associated with urinary tract infections (UTIs), cystitis, or overactive bladder.

Nocturia

Frequent urination during the night, common in older adults and in those with heart failure or prostate disorders.

Dysuria

Painful or burning urination, most commonly caused by infections of the urinary tract.

Urinary Incontinence

Involuntary leakage of urine, caused by a weakened sphincter, nerve damage, or an overactive bladder muscle.

Urinary Retention

Inability to fully empty the bladder, frequently associated with benign prostatic hyperplasia (BPH) or neurological conditions.

Oliguria and Anuria

Severely reduced urine output (oliguria) or complete absence of urine output (anuria), which may indicate serious kidney disease or circulatory failure.

Diagnosis of Micturition Disorders

Several diagnostic tools are available to evaluate micturition disorders:

Urinalysis and urine culture: Detection of infections, blood, or protein in the urine
Ultrasound of the bladder and kidneys: Assessment of residual urine and structural changes
Uroflowmetry: Measurement of urine flow rate and voiding speed
Urodynamic studies: Detailed assessment of bladder function and pressures
Cystoscopy: Direct visualization of the bladder wall when structural changes are suspected
Voiding diary: Documentation of fluid intake, voiding frequency, and urine volumes over 24–72 hours

When to See a Doctor

The following symptoms related to micturition should be evaluated by a healthcare professional:

Burning or pain during urination
Blood in the urine (hematuria)
Sudden, strong urge to urinate
Involuntary urine leakage
Significant changes in voiding frequency
Weak urine stream or interrupted urine flow
Pain in the kidney or bladder region

References

Abrams, P. et al. – The standardisation of terminology of lower urinary tract function. Neurourology and Urodynamics, 21(2):167–178, 2002.
Wein, A.J. et al. – Campbell-Walsh Urology (11th edition). Elsevier, Philadelphia, 2016.
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) – Urinary Retention. Available at: www.niddk.nih.gov

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