![]() ![]() These clusters of cells give rise to four DA systems shown in Figure 12.3:ġ. The major site of DA cell bodies is the midbrain. The structure of the monoamine neurotransmitters is shown in Figure 12.1. Histamine has been recognized as a neurotransmitter in the CNS only within the past fifteen years.Melatonin will not be covered further in this chapter. Melatonin, a second indolamine, is restricted to the pineal and is released into the blood stream in a manner that is regulated by the diurnal cycle. The name serotonin is derived from the fact that this substance was first isolated from the serum based on its ability to cause an increase in blood pressure. ![]()
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