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and is otherwise negligible. The characteristic pattern of skin hyperpigmentation seen during pregnancy may be a result of increased circulating maternal a-MSH (which may have originated from either the maternal or fetal pars intermedia), but a-MSH secretion does not seem to be involved in skin
273:
In lower vertebrates (fish, amphibians), MSH from the pars intermedia is responsible for darkening of the skin, often in response to changes in background color. This color change is due to MSH stimulating the dispersion of melanin pigment in the animal's skin melanocyte
229:. As technically part of the anterior pituitary, it separates the posterior pituitary and pars distalis. It is composed of large, pale cells that encompass the aforementioned colloid-filled follicles.
241:
or by vascular mechanism) as experimental sectioning of the pars intermedia from the hypothalamus has been noted to result in hypertrophy of the pars intermedia in various animals.
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In less developed vertebrates the pars intermedia is much larger, and structurally and functionally more well defined. In some animals including amphibians it mediates
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that can give a darker skin pigmentation. In the adult the pars intermedia is either very small or entirely absent.
406:
Ilahi, Sadia; Ilahi, Tahir B. (3 October 2022). "Anatomy, Adenohypophysis (Pars
Anterior, Anterior Pituitary)".
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278:. Some animals will thus increase a-MSH secretion when placed against a dark background as a means of
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Median sagittal through the hypophysis of an adult monkey. (Pars intermedia labeled at bottom center.)
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The pars intermedia appears to be tonically inhibited by stimuli from the hypothalamus (either by
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351:(12th ed.). Philadelphia, Pa: Saunders/Elsevier. p. 935.
326:(12th ed.). Philadelphia, Pa: Saunders/Elsevier. p. 895.
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Boundary between the anterior and posterior lobes of the pituitary
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Davies, Andrew; Blakeley, Asa G. H.; Kidd, Cecil, eds. (2001).
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Pars intermedia is seen between pars distalis and pars nervosa.
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Anatomy, Adenohypophysis (Pars
Anterior, Anterior Pituitary)
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162:. The intermediate lobe is a small region that is largely
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443: – Histology Learning System at Boston University
437: – Histology Learning System at Boston University
449:
at the
University of Oklahoma Health Sciences Center
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380:
249:The pars intermedia is responsible for secreting
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349:Guyton and Hall textbook of medical physiology
324:Guyton and Hall textbook of medical physiology
166:. It appears to be tonically inhibited by the
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882:List of human endocrine organs and actions
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347:Hall, John E.; Guyton, Arthur C. (2011).
322:Hall, John E.; Guyton, Arthur C. (2011).
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156:α-melanocyte-stimulating hormone (α-MSH)
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301:Anatomy, Head and Neck, Pituitary Gland
299:Ganapathy, MK; Tadi, P (January 2024).
265:tanning in response to light exposure.
255:corticotropin-like intermediate peptide
160:corticotropin-like intermediate peptide
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181:(MSH) which causes the release of
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225:. The cysts are the remainder of
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260:It is prominent only during the
251:α-melanocyte-stimulating hormone
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154:. The pars intermedia secretes
55:pars intermedia adenohypophysis
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179:melanocyte stimulating hormone
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142:is the middle lobe of the
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441:Histology image: 14101loa
435:Histology image: 14001loa
217:and two types of cells -
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239:dopaminergic innervation
550:Somatomammotrophic cell
412:. StatPearls Publishing
453:UIUC Histology Subject
447:Histology image: 38_11
135:
114:Anatomical terminology
177:, this area produces
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865:Organ of Zuckerkandl
855:Enteroendocrine cell
385:. pp. 397–398.
164:without blood supply
908:Human head and neck
644:Parafollicular cell
788:Islets of pancreas
562:Corticotropic cell
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95:H3.08.02.2.00007
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654:Parathyroid gland
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567:Gonadotropic cell
540:Somatotropic cell
392:978-0-443-04559-2
280:active camouflage
194:active camouflage
175:fetal development
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903:Endocrine system
839:Corpora arenacea
704:Zona reticularis
699:Zona fasciculata
694:Zona glomerulosa
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579:Chromophobe cell
572:Thyrotropic cell
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503:Pituitary gland
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493:Anatomy of the
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269:Other animals
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826:Pineal gland
816:Epsilon cell
754:Sertoli cell
667:Oxyphil cell
597:Pars nervosa
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414:. Retrieved
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223:chromophobes
209:It contains
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205:Microanatomy
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185:produced in
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168:hypothalamus
146:between the
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71:A09.4.02.017
67:A11.1.00.004
54:
877:Development
860:Paraganglia
834:Pinealocyte
749:Leydig cell
262:fetal stage
187:melanocytes
44:Identifiers
897:Categories
811:Delta cell
796:Alpha cell
662:Chief cell
416:9 February
286:References
233:Physiology
150:, and the
801:Beta cell
612:Pituicyte
589:Posterior
219:basophils
173:In human
872:Placenta
744:Testicle
512:Anterior
309:31855373
245:Function
213:-filled
806:PP cell
714:Medulla
631:Thyroid
211:colloid
200:Anatomy
183:melanin
39:Details
736:Gonads
686:Cortex
389:
355:
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307:
253:, and
158:, and
848:Other
761:Ovary
607:Stalk
215:cysts
118:[
107:74632
50:Latin
418:2023
387:ISBN
353:ISBN
328:ISBN
305:PMID
221:and
138:The
83:3858
62:TA98
457:991
102:FMA
78:TA2
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367:^
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90:TH
486:e
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
