The component of the nervous system that is the last to be involved in the process of swatting the mosquito is "axons in motor neurons."
Here's how it works: when the mosquito lands, sensory neurons (which have dendrites that detect the stimulus) send signals through their axons to the spinal cord and brain. Once the decision to swat is made, signals travel through the axons of motor neurons to your muscles, leading to the action of swatting. Hence, the axons in motor neurons are the final components involved in executing the action.