Explain The Pituitary Gland In Biology

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EXPLAIN THE PITUITARY GLAND IN BIOLOGY

Pituitary Gland:-

Pituitary Gland or hypophysis cerebri is reddish grey gland measuring 1 cm in length 1-1.5 gram. In Human females pituitary is slighty larger than the males. This gland is situated on the cone shaped hollow process called infundibulum which arises from the ventral wall or hypothalamus of the posterior part of fore brain that is diencephalon. The hypophysis is lodged in a deep depression in the sphenoid bone called sella turcica and is covered by a tough diaphragm called diaphragma sellae.

inter-relationship between pituitary gland and hypothalamus:-

pituitary gland is called master gland the hormones secreted by pituitary either regulate the action of other endocrine glands or directly affect the metabolism of non endocrine target tissue. regulating factors or hormones of hypothalamus of the pituitary gland . The median eminence of hypothalamus is directly connected to pituitary gland through pituitary stalk.

inter-relationship between pituitary gland and hypothalamus

Gross structure of pituitary gland :-

pituitary gland originates from the embryonic ectoderm . The gland consists of two mains parts Neurohypophysis, which develops in the form of a process arising from the floor of the diencephalon towards lowerside and adenohypophysis which orginatesin the embryo as a dorsal out pocketing of the roof of buccal cavity called rathke pouch.

Neurohypophysis is divided into three parts-

  1. proximal median eminence which is a funnel shaped extension of tuber cinereum .
  2.  infundibular stalk which form pituitary stalk with pars infundibularis or pars tuberalis  .
  3.  Distal infundibular process or lobus nervosa.