The dendrites, the cell body, and the axon.
The axon, an elongated portion of the neuron, carries impulses to the muscles.
Motor Neuron
The axon is the part of the neuron that can carry information for long distances.
Soma
synapse
Sensory neuron and motor neuron.
Cell Body
The synaptic cleft is the area of the neuron that secretes neurotransmitters.
The first part of the neuron to receive an impulse from an adjacent neuron is the dendrites. Dendrites are branch-like structures that extend from the neuron's cell body and are specialized to receive signals from other neurons. When a neurotransmitter is released from the adjacent neuron's axon terminal, it binds to receptors on the dendrites, initiating an electrical impulse that travels through the neuron.
It depends on what you mean by 'main'. The AXON is the part which CONVEYS the neural impulse, which could be thought of as the main FUNCTION of the neuron. But the DENDRITES are the parts which assess whether the neuron has been stimulated enough to fire the axon, which is another fundamental function of some neurons. And the BODY (soma) of the neuron is very much a 'main' part of the neuron, because without it the neuron would die.
as a nerve impules
axon