Now, sensory neurons and motor neurons. So these pathways that we discussed so far involve voluntary movement. So if I want to move my hand, if I want to extend it or bend it, this is basically a result of the somatic nervous system. The more division and the sensory division, now we are in complete control of this voluntary motion. But the somatic nervous system doesn't only control voluntary movement of skeletal muscle, it also controls reflex arcs that we are not in control of. So reflex arcs are basically those reflexes, those responses that we have no control over.