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Key Points. 1  Dendrites are the tree-like structures in neurons that extend away from the cell body to receive messages from other neurons at synapses; not all neurons have dendrites. 2  Synapses enable the dendrites from a single neuron to interact and receive signals from many other neurons.
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.