Colloid in the pituitary pars distalis of viscacha (Lagostomus maximus maximus): ultrastructure and occurrence in relation to season, sex, and growth

The Anatomical Record
Fabian H MohamedRamón Piezzi

Abstract

Randomly distributed extracellular colloidal accumulations were observed in the pars distalis of viscacha (Lagostomus maximus maximus). They were preferentially located in the peripheral zone of the gland and showed variability in shape and size. Two different types of colloidal accumulations were found by electron microscopy: 1) those surrounded by nongranulated follicular cells that correspond to characteristic follicles, and 2) those surrounded by granulated cells. In the follicles lined by nongranulated follicular cells, long, prominent microvilli and cytoplasmic processes protruded into the lumen. The frequency of these accumulations varies during the year in adult male animals, showing an increase in number during summer and a decrease during winter. The lowest value was registered in August (winter). The mean follicular diameter did not vary seasonally. The number of colloidal accumulations did not vary seasonally in adult female viscachas, but a significant difference in the mean follicular diameter between pregnant and non-pregnant females was observed. Pituitaries of immature animals contain fewer colloidal accumulations than those of adults. In fetuses, these accumulations were absent. The administration of melatonin...Continue Reading

References

Jan 1, 1978·Tissue & Cell·D R Ciocca, C B González
Sep 1, 1991·Biology of Reproduction·L B FuentesJ A Guzmán
Jan 1, 1970·Zeitschrift für Zellforschung und mikroskopische Anatomie·T Vanha-Perttula, A U Arstila
Jan 1, 1972·Zeitschrift für Zellforschung und mikroskopische Anatomie·K P Dingemans, C A Feltkamp
Nov 17, 1967·Science·S Gaston, M Menaker
Dec 1, 1981·General and Comparative Endocrinology·M Benjamin
Dec 1, 1996·Archives of Histology and Cytology·S OgawaK Inoue
Mar 1, 1957·The Anatomical Record·H H HOFFMAN, A KUNTZ
Dec 1, 1961·The Journal of Biophysical and Biochemical Cytology·G MILLONIG
Aug 1, 1951·The Journal of Endocrinology·E G BASSETT
Sep 1, 1948·The Anatomical Record·H H HANKE, H A CHARIPPER

Citations

Mar 3, 2012·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·E M ChavesS Dominguez
Jan 23, 2016·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Kunwar P BhatnagarHeiko D Frahm
Dec 30, 2009·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Verónica P Filippa, Fabian H Mohamed
Aug 21, 2015·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Maximiliano ChavesFabian H Mohamed
Jul 30, 2014·Animal Reproduction Science·Naira Caroline Godoy PieriDaniele Dos Santos Martins
Mar 26, 2005·The Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology·Edith Perez RomeraRamón Piezzi
Feb 21, 2008·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Verónica P Filippa, Fabian H Mohamed
May 1, 2010·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Edith Perez RomeraL Scardapane

Related Concepts

Age Factors
Metazoa
Hydrocolloids
Melatonin
Electron Microscopy
Neurons
Pituitary Stalk
Family Dipodidae
Seasonal Variation

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