Basic structure of the Nervous System 3

you can find second part here https://steemit.com/body/@skytoin/basic-structure-of-the-nervous-system-2-part-two
There are many different structures of neurons, one important feature is how many processes extend from the cell body of neuron. Around 99% of neurons are multipolar neurons, they have three or above processes sticking out from the cell body. It usually has one axon and many dendrites. Bipolar neurons have two processes one axon and one dendrite on the other side from axon. We have very few bipolar neurons, they are located in special sensory places for example retina of the eye. Unipolar neurons have only one process, you can find them in the sensory receptors.
The sensory (afferent neurons get messages and send them from sensory receptors (skin for example) toward central nervous system. These neurons usually are unipolar. The motor (efferent neurons) send messages from the central nervous system to the muscles and glands. These neurons are usually multipolar. Internuerons (association neurons) are located in the central nervous system. They transmit messages between sensory neurons and motor neurons. These neurons are usually multipolar.