Human egg. Coloured scanning electron micrograph (SEM) of a human egg with cumulus corona cells. The rounded egg or oocyte (yellow) has a spongy surface layer. This layer, known as the zona pellucida, serves to protect the egg and to attract sperm for fertilisation and allow them to attach. Around part of the egg are cumulus corona cells (pink) which serve to support and nourish the developing egg in the ovary, forming a 'corona radiata' (radiating crown) around the egg.
CREDIT: DR YORGOS NIKAS / SCIENCE PHOTO LIBRARY / Universal Images Group, Rights Managed / For Education Use Only
CITATION: Colour SEM of human egg with corona radiata cells. Photography. Encyclopædia Britannica ImageQuest. Web. 18 Apr 2016. http://quest.eb.com/search/132_1285125/1/132_1285125/cite
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