The Pineal Gland
The pineal gland is a small reddish-gray body and is about 8 mm in size for humans. It's located between the laterally positioned thalamic bodies and it is part of the epithalamus. The pineal gland consists mainly of pinealocytes, but it has been identified with four other types of cell types too. The pineal body does have nervous tissue, and consists of follicles lined by epithilium and contianed by connective tissue. These follicles contain a large quantity of gritty material, composed of phosphate, carbonate, and ammonia.
The function of the pineal gland is to be responsible for the production of melatonin, which has a role in regulating circadian ryhtms. The production of melatonin by the pineal gland is stimulated by darkness and inhibited by light. Light can be detected by the SCN which has direct connections to the retina. Fibers extend from the SCN to the spinal cord then into the SCG and from there into the pineal gland.
The pineal gland also contains a substance which......
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