NEET (NTA)-National Eligibility cum Entrance Test (Medical) Biology Human Physiology-Neural Control and Coordination Revision (Page 7 of 17)

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Hormones of Pineal gland

Origin; It develops from the ectoderm of the embryo

Location and Structure; it is a small rounded structure located between cerebral hemispheres, protruding from the roof of the third ventricle. it consists of pineal cells (pinealocytes) and supporting glial cells.

Image of Pineal Glands

Image of Pineal Glands

Showing the Pineal Glands in image

Hormones hormone melatonin is secreted by it. Melatonin shows a diurnal variation. Its concentration in the blood rises in the evening and through the night and

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Hormones of Thymus

Origin; it is derived from the endoderm of the embryo

Location and structure; it is located in the upper part of thorax near the heart. It is a soft, pinkish, bilobed mass of lymphoid tissue. It is prominent at the time of birth but gradually atrophies in the adult.

Image of Thymus Glands

Image of Thymus Glands

showing the Thymus Glands in image

Hormone: it secrets a hormone thymosin.

Functions; its functions are not very clear

  • It stimulates the development of WBCs which are involved in the immunity.

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