The criteria, key locations, classifications and functions of common neuro transmitters is reviewed and discussed. Neurotransmitters are the brain chemicals that communicate information throughout our brain and body. They relay signals between neurons. To be neurotransmitter the molecule must be present in the brain and distributed unevenly and enzymes that help to create the neurotransmitter m...

Melatonin and serotonin are endogenous neurotransmitters hormones produced by tryptophan metabolism. present in the heads, eyes, optic lobes, brains of various invertebrates. Insects produce melatonin via same pathways that vertebrates do. They pleiotropic signaling chemicals regulate a wide range physiological processes protect against disease environmental factors species. In insects, they fu...