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Also known as
Urination, voiding, uresis, emiction, passing water, making water, emptying the bladder, void, pee, wee
Definition
Micturition, also known as urination, is the physiological process of emptying urine from the urinary bladder through the urethra to the outside of the body.1 This vital human bodily function involves a complex network of neural signals between the nervous system and the urinary tract.2 The micturition reflex requires coordinated activity between the brain, spinal cord, and peripheral ganglia, which regulate both the storage and emptying phases of bladder function.3 During storage, the detrusor muscle relaxes while the urethral sphincter contracts; during voiding, this pattern reverses with detrusor contraction and sphincter relaxation, allowing urine to flow.4 The process transitions from involuntary in infants to voluntary control in adults, typically by 3-5 years of age, through neural development and maturation.5
Clinical Context
Micturition is clinically significant in the diagnosis and management of various urological and neurological conditions.1 Normal micturition requires intact neural pathways between the brain, spinal cord, and bladder, with disruptions potentially leading to disorders such as urinary incontinence, urinary retention, or detrusor-sphincter dyssynergia.2
Clinicians evaluate micturition through urodynamic studies, which assess bladder function, capacity, and pressure during filling and emptying phases.3 Conditions affecting micturition include urinary tract infections, interstitial cystitis, benign prostatic hyperplasia, neurogenic bladder, spinal cord injuries, multiple sclerosis, Parkinson’s disease, and stroke.4
Treatment approaches vary based on the underlying cause and may include behavioral modifications, pelvic floor exercises, pharmacotherapy targeting specific neurotransmitter receptors (particularly muscarinic and adrenergic), neuromodulation, or surgical interventions.5 Understanding the complex neural control of micturition is essential for developing effective treatments for lower urinary tract dysfunction.