Canadian Medical Guide > Anatomy > Urogenital System > Genitalia > Germ Cells > Ovum Terms and Definitions

Ovum

Medical Definition:	A mature haploid female germ cell extruded from the OVARY at OVULATION.
Guide Notes:	differentiate from EGGS (Cat J2); /transpl is not implantation ( = OVUM IMPLANTATION)

Ovum Categories.

	Oocytes - Female germ cells derived from OOGONIA and termed OOCYTES when they enter MEIOSIS. The primary oocytes begin meiosis but are arrested at the diplotene state until OVULATION at PUBERTY to give rise to haploid secondary oocytes or ova (OVUM).
	Oogonia - Euploid female germ cells of an early stage of OOGENESIS, derived from primordial germ cells during ovarian differentiation. Oogonia undergo MEIOSIS and give rise to haploid OOCYTES
	Zona Pellucida - A tough transparent membrane surrounding the OVUM. It is penetrated by the sperm during FERTILIZATION.
	Zygote - The fertilized OVUM resulting from the fusion of a male and a female gamete.

Ovum Medical Definitions and Terms

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