What part of a neuron receives signals and sends a message to the cell body? what part of a neuron receives signals and sends a message to the cell body? axon terminal axon dendrite axon hillock?

Dendrite.

A dendrite is a projection from a neuron that propagates to the cell body the electrochemical stimulation it receives from other neurons. 
Dendrites were first described by Wilhelm His, in 1889, as the "protoplasmic processes" that come from a neuron. Later, Otto Friedrich Karl Deiters distinguished the axon from the dendrites as another different structure.