Postmicturition dribbling is due to
**Core Concept**
Postmicturition dribbling, also known as urinary incontinence or urinary leakage after urination, is a common condition affecting individuals of all ages. The underlying mechanism involves the failure of the external urethral sphincter and the urethral closure mechanism to maintain continence, leading to involuntary leakage of urine.
**Why the Correct Answer is Right**
Postmicturition dribbling is primarily caused by the incomplete relaxation of the external urethral sphincter and the urethral sphincter mechanism after urination. This is due to the loss of the sympathetic tone, which normally helps to relax the external urethral sphincter. As a result, the residual urine in the urethra is not completely emptied, leading to dribbling. The urethral sphincter mechanism, which is responsible for maintaining continence, also fails to function properly, contributing to the dribbling.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the pathophysiology of postmicturition dribbling.
* **Option B:** While pelvic floor muscle weakness can contribute to urinary incontinence, it is not the primary cause of postmicturition dribbling.
* **Option D:** Neurogenic bladder can cause urinary incontinence, but it is not directly related to postmicturition dribbling.
**Clinical Pearl / High-Yield Fact**
To diagnose postmicturition dribbling, it is essential to ask patients about their symptoms, including the timing and frequency of dribbling, as well as any associated factors such as constipation or coughing.
**Correct Answer: C. Incomplete relaxation of the external urethral sphincter and the urethral sphincter mechanism after urination.**