Chemical substances that transport nerve impulses from one neuron to another neuron or muscle or gland are called neurotransmitters. It is stored in vesicles of pre-synaptic neurons. Acetyl choline is the most commonly used neurotransmitter. Hormone-like chemicals released from neurons are called neurohormones. Neurosecretion is the chemical released from the end of a neuron.
1. Central Nervous System Neurotransmitters: Dopamine, glycine, serotonin, endorphin, dynophin, asinosin, neurotensin, somatostatin, prostaglandin, and nitric oxide.
2. Peripheral Nervous System Neurotransmitters: Acetyl Choline, Histamine, Epinephrine, Nor-epinephrine, Adrenaline and Nor-adrenaline.