NEET (NTA)-National Eligibility cum Entrance Test (Medical) Biology Human Physiology-Neural Control and Coordination Revision (Page 11 of 17)

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Disorders of Growth Hormones

Disorders of growth hormone are caused both by high secretion and low secretin of growth hormone.

Increased secretion: the pituitary is enlarged and if the gland presses optic chiasma it ultimately affects vision. Excessive secretion of growth hormone causes clinical conditions like

1. Gigantismgiant means very tall it is caused by over secretion of hormone before adolescence (before the closure of the epiphysis) by acidophilic tumor or excessive stimulation of acidophilic cells.

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Hormones of thyroid gland

  • Origin; it develops from the endoderm of the embryo.
  • Location; thyroid is the largest endocrinal gland, located anterior to the thyroid cartilage of the larynx in the neck. It is bilobed structure, the two lobes are connected by a narrow structure called isthmus. It is well supplied with blood vessels.
 Image of lobes of Thyroid

Image of Lobes of Thyroid

Showing lobes of thyroid in image

The microscopic structure; thyroid gland is made up of multiple follicles (acini). The follicles are lined by single laye

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