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Updated: Jun 21, 2026

Human Egg Maturity Assessment and Its Clinical Application
Published on: August 19, 2019
Morphological criteria of oocyte quality
Kristina Lasiene1, Aleksandras Vitkus, Angelija Valanciūte
1Department of Histology and Embryology, Kaunas University of Medicine, A. Mickeviciaus, 44307 Kaunas, Lithuania. krislasi@itc.kmu.lt
Abstract:
In vitro fertilization technology consists of the selection and fertilization of oocytes, the production and transplantation of embryos to recipients. The quality of oocytes has a direct impact on the fertilization and developmental competence of oocytes. Criteria that show the quality of oocytes are subdivided into morphological, cellular, and molecular. The aim of this article was to review the morphological criteria that are used for estimation of the quality of oocytes before their fertilization in vitro. These criteria include the evaluation of the structure of oocyte: cumulus complex, oocyte cytoplasm, polar body, perivitelline space, zona pellucida, and meiotic spindle.
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