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Each axon terminal contains thousands of membrane-bound sacs called vesicles, which in turn contain thousands of neurotransmitter molecules each. Neurotransmitters are chemical messengers which relay, amplify and modulate signals between neurons and other cells.
Therefore, when a signal reaches the relay neuron from the sensory neuron, the relay neurons will directly send a signal to the motor neurons.   The main function of neuron cells are to carry signals.   There are three types of neurons.Sensory, relay, and motor neuron. Sensory neurons carry signals from the r â¦ eceptors in our body (e.g. thermal, pressure etc.) to the relay neurons, which are found in our spinal cord.Relay neurons then send signals along the spinal cord to the brain.herefore, when a signal reaches the relay neuron from the sensory neuron, the relay neurons will directly send a signal to the motor neurons.   The main function of neuron cells are to carry signals.   There are three types of neurons.