Human ovum (egg)

Human ovum (egg)


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Light micrograph of a human ovum, showing the egg surrounded by its protective glycoprotein layer, the zona pellucida. The ovum (egg) is produced in the ovary, where it matures as a follicle in the body of the ovary, migrating to the surface prior to ovulation, where it enters the fallopian tube. Potential fertilisation is likely to occur in the chemically- favourable environment of the fallopian tube. The ovum has a life expectancy of 12-24 hours, before which time 1 spermatozoon must penetrate the nucleus for fertilisation to take place.

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