Urinary Function and Continence Fundamentals

📋 Course Outline

1. Definitions of Urinary Functions
2. Micturition Process
3. Neurological Control of Micturition
4. Anatomy of Female Urethra
5. Physiology of Urinary Continence

📖 1. Definitions of Urinary Functions

🔑 Key Concepts & Definitions

Bladder capacity: The volume the bladder can hold, typically between 300 and 500 ml, defining its normal storage limits.

Micturition: A voluntary act involving the contraction of the detrusor muscle and relaxation of the urethra until the bladder is empty, as described by CHU TLEMCEN (2002).

Stress incontinence: Sudden urine leakage without urge, triggered by increased abdominal pressure during activities like coughing, sneezing, or effort, often occurring without a sensation of urge, and provoked by effort or position changes.

📝 Essential Points

Micturition requires the coordinated contraction of the detrusor muscle and relaxation of the urethra until the bladder is empty. This process involves a complex neurological control system, including receptors sensitive to bladder stretch, information relayed to medullary centers, and integration at the cortical level, which allows voluntary control over urination.

Stress incontinence occurs without a preceding urge and is provoked by increased abdominal pressure during effort or position changes, such as coughing, sneezing, or lifting. It manifests as a sudden emission of urine through the urethral meatus during these activities.