File:Pituitary histology 003.jpg

From Embryology

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Pituitary Histology - Neurohypophysis

Stain - PAAB / Periodic acid-Schiff / Orange G Neurohypophysis (posterior pituitary)

  • cells are pituicytes and also present are hypothalamic neurosecretory cell unmyelinated nerve fibres (from the supraoptic and paraventricular nuclei).
  • pituicyte oval or round nuclei are visible.
  • Herring bodies are dilations of nerve fibres filled with small neurosecretory vesicles.
    • nerve fibres terminate close to capillaries.
  • hormones are releasing and release-inhibiting factors produced regulating adenohypophysis activity (as well as 2 other 9 aa hormones).
    • Oxytocin - pregnancy stimulates uterine smooth muscle the contraction and lactation milk ejection reflex.
    • Antidiuretic hormone - (ADH, vasopressin, arginine vasopressin, AVP) acts on kidneys to concentrate urine (water retention).

Identify nuclei of pituicytes and Herring bodies.

Pituitary Histology: Pituitary overview | Anterior H&E | Anterior H&E | Anterior labeled | PAS/O Overview | Acidophils | Basophils | Posterior labeled | Posterior unlabeled | Histology Stains | BGD - Endocrine Histology | Pituitary Development

Pituitary, sheep - PAAB/PAS/Orange G

Links: Histology | Histology Stains | Blue Histology images copyright Lutz Slomianka 1998-2009. The literary and artistic works on the original Blue Histology website may be reproduced, adapted, published and distributed for non-commercial purposes. See also the page Histology Stains.

Cite this page: Hill, M.A. (2024, May 27) Embryology Pituitary histology 003.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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