Neurons are born in areas of the brain that are rich in concentrations of neural precursor cells (also called neural stem cells). It is the axon that propagates the nerve impulse, which is communicated to one or more cells. In bipolar neurons, two extensions leave the cell body, one dendrite and one axon. But there are also bipolar and pseudo unipolar neurons. Most neurons have several dendrites and one axon, so they are called multipolar. That single axon can branch repeatedly to communicate with many target cells. Most neurons have three regions responsible for specialized functions: cell body, dendrites, and axons. Neurons are usually described as having one, and only one, axon-a fiber that emerges from the cell body and projects to target cells. Most neurons have multiple dendrites, which extend out-ward from the cell body and are specialized to receive chemical signals from the axon termini of other neurons. However, almost all possible combinations of pre- and postsynaptic elements have been found in the central nervous system. Bipolar: have one axon and one dendrite and are present in the retina of the eye) Unipolar: have a cell body with one axon only and are found usually in the embryonic stage Also neurons can also be classified based on the direction in which they carry nerve impulses. Now, we have got the complete detailed explanation and answer for everyone, who is interested! Those ramificationsdendrites by the dozen to collect incoming signals, called action potentials, from other neurons, and a single axon to pass on the summed wisdom of those signals in the form of. According to the classical definition of synapse, when a nerve ending synapses on a dendrite or soma of a second neuron it is termed either an axodendritic or an axosomatic synapse, respectively ( Chapter 7 ).
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