Colorized scanning electron micrograph of a human egg. The egg is surrounded by a glycoprotein coat called the zona pellucida which aids in trapping and binding the sperm. Two residual coronal cells from the ovarian follicle are attached to the zona pellucida. The egg is sitting on the point of a pin.
B0002100 Human egg with coronal cells - gold. Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/