If the sympathetic nerves to urinary bladder are sectioned, it will result in:
## **Core Concept**
The urinary bladder receives dual innervation from the autonomic nervous system, including both sympathetic and parasympathetic nerves. The sympathetic nerves to the bladder primarily originate from the inferior hypogastric plexus and are involved in the storage of urine by promoting bladder relaxation.
## **Why the Correct Answer is Right**
Sectioning the sympathetic nerves to the urinary bladder would eliminate the sympathetic input that normally helps to relax the bladder and promote urine storage. The parasympathetic nerves, which promote bladder contraction and urine voiding, would still be intact and could potentially have a relatively unopposed effect. However, the primary effect of cutting sympathetic nerves would be related to the loss of sympathetic inhibition on the bladder. This leads to an inability to properly store urine due to the bladder's increased sensitivity to stretch and a potential for more frequent contractions. The correct answer relates to the understanding that without sympathetic nerves, the bladder might not be able to adequately store urine, potentially leading to urinary urgency and frequency.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option might suggest an increase in bladder contraction, which could be misleading because the direct effect of sympathetic nerves is more about relaxation (storage) rather than contraction.
- **Option B:** This could imply a decrease in the urge to void, which contradicts the expected outcome since the loss of sympathetic input would likely make the bladder more prone to contraction and the sensation of urgency.
- **Option C:** This might imply no significant change, which underestimates the role of sympathetic nerves in bladder function, particularly in the storage phase.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the sympathetic nervous system plays a crucial role in the storage of urine by facilitating bladder relaxation. Damage to these nerves can lead to issues with urine storage, such as urgency and frequency. A classic clinical scenario involves patients with spinal cord injuries who may experience autonomic dysreflexia, leading to an urgency to void.
## **Correct Answer:** . Increased desire to void.