When released from the ovary, the ooycte (orange) is surrounded by two structures: a matrix of glycoproteins, called the zona pellucida (brown rim), and a layer of follicler cells, called the corona radiata (yellow). Human fertilization begins when the sperm finds its way through the corona radiata and binds to a sugar group in the zona pellucida. (cell.com by Spike Walker)

Image Source (link).  Light micrograph showing sperm and an egg cell (or ovum) during a failed IVF attempt.

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