Parasympathetic motor neurons trigger the detrusor muscle to contract, which raises the intra-bladder pressure, if the response is to void.
The internal sphincter relaxes as a result of the increased pressure, allowing urine to enter the bladder neck and flow into the urethra.
Stimulus: 300–400 ml of pee are required to start the micturition reflex. Stretch receptors are found in the bladder wall. 3. Afferent: Parasympathetic pelvic Stimulus: 300–400 ml of pee are required to start the micturition reflex. 2. Afferent: Pelvic parasympathetic receptors 3. Receptor: Stretch receptors on the bladder wall 4. S2-S4 Center 5. Efferent: Parasympathetic Pelvic 6. Effectors: Stretch receptors on the bladder and urethra walls are stimulated to cause this reaction. when the intravesical pressure rises.
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