Human Egg

In humans the ovum is fertilized inside the female body and the embryo then develops inside the uterus, receiving nutrition directly from the mother.

The human ova grow from primitive germ cells that are embedded in the substance of the ovaries. Each of them divides repeatedly to give rise to several smaller cells, the oogonia. The oogonia then develop via meiosis into the ova, the primary oocytes, and the polar bodies.

The ovum is one of the largest cells in the human body, typically visible to the naked eye without the aid of a microscope or other magnification device. The human ovum measures approximately 0.12 mm in diameter. (Adapted from Wikipedia)


Image from Wellcome images (link)

This image is of a purple, colour-enhanced human egg sitting on a pin. The egg is coated with the zona pellicuda, a glycoprotein that protects the egg but also helps to trap and bind sperm. Two coronal cells from the ovarian follicle are attached to the zona pellicuda.

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