GENERAL HISTOLOGY

Detailed explanation-1: -The pineal gland contains no true neurons, only glial cells. Through a complicated process involving the hormone melatonin, it participates in regulation of the body’s circadian (24-hour) rhythms. The stria medullaris connects fibers from the habenular nuclei with the limbic system.

Detailed explanation-2: -A main function of the epithalamus is the secretion of melatonin by the pineal gland.

Detailed explanation-3: -The function of the epithalamus is to connect the limbic system to other parts of the brain. Some functions of its components include the secretion of melatonin by the pineal gland (involved in circadian rhythms), and regulation of motor pathways and emotions.

Detailed explanation-4: -Melatonin is the only known hormone synthesized by the pineal gland and is released in response to darkness hence the name, “hormone of darkness” [10]. Melatonin provides a circadian and seasonal signal to the organisms in vertebrates.