that process of a neuron by which impulses travel away from the cell body; at the level of the terminal arborization of the axon, the impulses are transmitted to other nerve cells or to effector organs. Larger axons are covered with a myelin sheath.ax´onal http://medical-dictionary.thefreedictionary.com/axon Definition of synapse synapse /syn·apse/ (sin´aps) site of functional apposition between neurons, where an impulse is transmitted from one to the other, usually by a chemical neurotransmitter released by the axon terminal of the presynaptic neuron. The neurotransmitter diffuses across the gap to bind to receptors on the postsynaptic cell membrane and cause electrical changes in that neuron (depolarization/excitation or hyperpolarization/inhibition). http://medical-dictionary.thefreedictionary.com/synapse Chemistry of smell http://cactus.dixie.edu/smblack/chem1010/lecture_notes/2D_chemistry_of_smell.pdf slide 16 18 20 21 22