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Related Experiment Videos

Pituitary anatomy and physiology.

Arun Paul Amar1, Martin H Weiss

  • 1Department of Neurological Surgery, Keck School of Medicine, University of Southern California, 1200 North State Street, Suite 5046, Los Angeles, CA 90033-1029, USA. amar@aya.yale.edu

Neurosurgery Clinics of North America
|April 15, 2003
PubMed
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The pituitary gland, the body's "master gland," regulates homeostasis and reproduction. It comprises three lobes (anterior, intermediate, posterior) with distinct functions and hormones, crucial for endocrine system control.

Area of Science:

  • Endocrinology
  • Neuroscience
  • Embryology

Background:

  • The pituitary gland, or
  • master gland,
  • is vital for homeostasis, reproduction, and endocrine function.
  • It is anatomically linked to the hypothalamus, visual pathways, and cranial nerves.
  • The gland develops from two embryonic structures: Rathke's pouch (anterior/intermediate lobes) and the infundibulum (posterior lobe).

Purpose of the Study:

  • To provide a comprehensive overview of the pituitary gland's anatomy, embryology, and function.
  • To detail the distinct roles and secretory products of the anterior, intermediate, and posterior pituitary lobes.
  • To highlight the regulatory mechanisms governing pituitary hormone release.

Main Methods:

Related Experiment Videos

  • Review of anatomical and embryological literature.
  • Analysis of the distinct cellular compositions and secretory products of each pituitary lobe.
  • Examination of the hypothalamic-pituitary axis and regulatory pathways.

Main Results:

  • The pituitary gland consists of three functionally distinct lobes: anterior, intermediate, and posterior.
  • The anterior lobe secretes TSH, ACTH, LH, FSH, GH, and prolactin, regulated by the hypothalamus via the portal system.
  • The posterior lobe releases oxytocin and vasopressin from hypothalamic neurons.
  • The intermediate lobe, rudimentary in humans, produces hormones with emerging physiological significance.

Conclusions:

  • The pituitary gland's three lobes function as independent endocrine units.
  • Understanding the pituitary's structure and function is essential for comprehending endocrine regulation.
  • Further research into the intermediate lobe's hormonal functions is warranted.