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Medicina is published by MDPI from Volume 54 Issue 1 (2018). Articles in this Issue were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence. Articles are hosted by MDPI on as a courtesy and upon agreement with Lithuanian Medical Association, Lithuanian University of Health Sciences, and Vilnius University.
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Morphological criteria of oocyte quality

Department of Histology and Embryology, Kaunas University of Medicine
Department of Anatomy and Physiology, Lithuanian Veterinary Academy, Lithuania
Author to whom correspondence should be addressed.
Medicina 2009, 45(7), 509;
Received: 23 November 2007 / Accepted: 3 July 2009 / Published: 8 July 2009
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.
Keywords: oocytes; quality; morphological criteria oocytes; quality; morphological criteria
MDPI and ACS Style

Lasienë, K.; Vitkus, A.; Valanèiûtë, A.; Lasys, V. Morphological criteria of oocyte quality. Medicina 2009, 45, 509.

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