Difference between revisions of "Pituitary gland"
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==Pituitary adenoma== | ==Pituitary adenoma== | ||
Features: | Features:<ref name=Ref_PSNP36>{{Ref PSNP|36}}</ref> | ||
*Loss of fibrous stroma. | *Loss of fibrous stroma. | ||
Revision as of 02:57, 1 November 2010
The pituitary gland is known as the master gland.
Divisions:[1]
- Anterior pituitary (AKA adenohypophysis).
- Posterior pituitary (AKA neurohypophysis, neural pituitary).
Function
Anterior part:[2]
- Growth hormone (GH).
- Luteinizing hormone (LH)
- Follicle-stimulating hormone (FSH)
- Thyroid stimulating hormone (TSH)
- Adrenocorticotropic hormone (ACTH)
- Prolactin (PRL)
Mnemonic: "Go Look For The Adenoma Please" = GH, LH, FSH, TSH, ACTH, PRL.
Posterior part:[2]
- Oxytocin.
- Antidiuretic hormone (ADH).
Anatomy and histology
Basic anatomy (simplified):[3]
- Anterior:
- Pars distalis.
- Pars intermedia.
- Posterior:
- Pars nervosa.
Embryological origin:[3]
- Anterior - Rathke's pouch (roof of mouth).
- Posterior - diencephalon (ventral aspect).
Image:
Histology
Anterior
- Acidophils (40% of cells) = red or orange.
- GH, PRL.
- Basophils (10% of cells) = basophilic (light blue).
- TSH, LH, FSH.
- Chromophobes (50% of cells) = amphophilic (purplish/grey).
Notes:
- The cellular product (i.e. hormone produced) is not strictly correlated with the cell type.[4]
Posterior
Features:[4]
- Herring bodies - key feature.
- Eosinophilic axonal dilations filled with lysosomes and neurosecretory granules.
- Less cellular.
- Usually more cellular in perivascular location.
Image: Herring bodies (ouhsc.edu).
Pituitary adenoma
Features:[5]
- Loss of fibrous stroma.
Rathke cleft cyst
- Arises from intermediate lobe.
See also
References
- ↑ http://www.vivo.colostate.edu/hbooks/pathphys/endocrine/hypopit/histo.html
- ↑ 2.0 2.1 http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/Pituitary.html
- ↑ 3.0 3.1 URL: http://www.vivo.colostate.edu/hbooks/pathphys/endocrine/hypopit/histo_pit.html. Accessed on: 31 October 2010.
- ↑ 4.0 4.1 Perry, Arie; Brat, Daniel J. (2010). Practical Surgical Neuropathology: A Diagnostic Approach: A Volume in the Pattern Recognition series (1st ed.). Churchill Livingstone. pp. 26. ISBN 978-0443069826.
- ↑ Perry, Arie; Brat, Daniel J. (2010). Practical Surgical Neuropathology: A Diagnostic Approach: A Volume in the Pattern Recognition series (1st ed.). Churchill Livingstone. pp. 36. ISBN 978-0443069826.
External links
- Neuropathology - neuropathologyweb.org.