Ultrastructure of the ovarian follicles in the placentotrophic Andean lizard of the genus Mabuya (Squamata: Scincidae)

Journal of Morphology
Simón VieiraMartha Patricia Ramírez-Pinilla

Abstract

We studied the ultrastructural organization of the ovarian follicles in a placentotrophic Andean lizard of the genus Mabuya. The oocyte of the primary follicle is surrounded by a single layer of follicle cells. During the previtellogenic stages, these cells become stratified and differentiated in three cell types: small, intermediate, and large globoid, non pyriform cells. Fluid-filled spaces arise among follicular cells in late previtellogenic follicles and provide evidence of cell lysis. In vitellogenic follicles, the follicular cells constitute a monolayered granulosa with large lacunar spaces; the content of their cytoplasm is released to the perivitelline space where the zona pellucida is formed. The oolemma of younger oocytes presents incipient short projections; as the oocyte grows, these projections become organized in a microvillar surface. During vitellogenesis, cannaliculi develop from the base of the microvilli and internalize materials by endocytosis. In the juxtanuclear ooplasm of early previtellogenic follicles, the Balbiani's vitelline body is found as an aggregate of organelles and lipid droplets; this complex of organelles disperses in the ooplasm during oocyte growth. In late previtellogenesis, membranous org...Continue Reading

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Citations

Oct 5, 2010·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Martha Patricia Ramírez-PinillaElena Stashenko
Jun 4, 2015·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Daniel G Blackburn
Apr 12, 2017·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Nathaly Hernández-DíazMartha Patricia Ramírez-Pinilla
Dec 7, 2018·Zoological Science·Débora da SilvaMary Anne Heidi Dolder
Feb 12, 2021·The Journal of Experimental Biology·Nathaly Hernández-DíazMartha Patricia Ramírez-Pinilla

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