Pars intermedia is the boundary between the anterior and posterior lobes of the pituitary. It contains colloid-filled cysts and two types of cells - basophils and chromophobes. The cysts are the remainder of Rathke’s pouch. 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.[1]
Pars intermedia
Median sagittal through the hypophysis of an adult monkey. (Pars intermedia labeled at bottom center.)
Pars intermedia is seen between pars distalis and pars nervosa.
In human fetal life, this area produces melanocyte stimulating hormone or MSH which causes the release of melanin pigment in skin melanocytes (pigment cells). However, the pars intermedia is normally either very small or entirely absent in adulthood.
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 dermal (skin) melanophore cells.
ReferencesEdit
^Ilahi, Sadia; Ilahi, Tahir B. (3 October 2022). "Anatomy, Adenohypophysis (Pars Anterior, Anterior Pituitary)". Anatomy, Adenohypophysis (Pars Anterior, Anterior Pituitary). StatPearls Publishing. Retrieved 9 February 2023.
External linksEdit
Histology image: 14001loa – Histology Learning System at Boston University
Histology image: 14101loa – Histology Learning System at Boston University
Histology image: 38_11 at the University of Oklahoma Health Sciences Center
pars, intermedia, boundary, between, anterior, posterior, lobes, pituitary, contains, colloid, filled, cysts, types, cells, basophils, chromophobes, cysts, remainder, rathke, pouch, technically, part, anterior, pituitary, separates, posterior, pituitary, pars,. Pars intermedia is the boundary between the anterior and posterior lobes of the pituitary It contains colloid filled cysts and two types of cells basophils and chromophobes The cysts are the remainder of Rathke s pouch 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 1 Pars intermediaMedian sagittal through the hypophysis of an adult monkey Pars intermedia labeled at bottom center DetailsIdentifiersLatinpars intermedia adenohypophyseosTA98A11 1 00 004 A09 4 02 017TA23858THH3 08 02 2 00007FMA74632Anatomical terminology edit on Wikidata Pars intermedia is seen between pars distalis and pars nervosa In human fetal life this area produces melanocyte stimulating hormone or MSH which causes the release of melanin pigment in skin melanocytes pigment cells However the pars intermedia is normally either very small or entirely absent in adulthood 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 dermal skin melanophore cells References Edit Ilahi Sadia Ilahi Tahir B 3 October 2022 Anatomy Adenohypophysis Pars Anterior Anterior Pituitary Anatomy Adenohypophysis Pars Anterior Anterior Pituitary StatPearls Publishing Retrieved 9 February 2023 External links EditHistology image 14001loa Histology Learning System at Boston University Histology image 14101loa Histology Learning System at Boston University Histology image 38 11 at the University of Oklahoma Health Sciences Center UIUC Histology Subject 991 Retrieved from https en wikipedia org w index php title Pars intermedia amp oldid 1138651587, wikipedia, wiki, book, books, library,
