A nerve transmission consists of an ______message pushingom______ into the ______where they bind or dock with -_________. Once they bind like a key in a lock, they start another ________message and then they sucked back into the__________ -synaptic neuron for re-use. The limbic system is the_______ and _______center of the brain. _______is the primary neurotransmitter in the limbic system. The fasciculus retroflexus is a track of cells that connects the limbic system with the pre-frontal cortex. It is the center for_______-_______. ​