There are areas of the brain which deal with speech, hearing, smell, sight, movements, salivating, and so on. If your brain is anything like mine, the sensory areas and motor areas are connected up so that when you are stimulated, you do something sensible. Other stumuli are much more complicated and we do not all react or respond in the same way. Well it all depends on whether you know the lion and if you thought he was hungry. Some people make a big big fuss when they see a fly because they think that it is a wasp and it will sting them to death.
Sensory nerves contain sensory neurones.
Motor nerves contain motor neurones. Mixed nerves contain both sensory and motor neurones. Sensory, intermediate and motor nerves have gaps between them called synapses . They are insulated from each other by their myelin sheathes. The dendrites of one cell do not actually touch the dendrites of any other cell.