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A reflex arc is a neural pathway that controls a reflex action. In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord.his characteristic allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of routing signals through the brain, although the brain will receive sensory input while the reflex is carried out. Analysis of the signal takes place after action has been taken.
Reflex arc for micturition invovles the sensory input (the afferent neruon) to the spinal cord consisting of the stretch receptors located on the urinary bladder and the effer â¦ ent neurons consisting of the parasympathetic (usually pelvic splanchincs). The pelvic splanchnic cause the detrusor muscle to contract. The reflex arc also contains an efferent somatic (pudendal nerve) output to the external sphincter which relaxes the external sphinctor and causes the urine to flow through the urethra.