Sea urchin two-cell embryo

Sea urchin two-cell embryo

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Credit: HERVE CONGE, ISM/SCIENCE PHOTO LIBRARY

Caption: Sea urchin two-cell embryo, light microscope. Image 1 of 3. The cells, or blastomeres, result from the first division of the fertilised egg, which normally occurs around 90 hours after fertilisation. They are surrounded by the zona pellucida, a tough outer layer. Following fertilisation an embryo undergoes multiple rounds of cell division, each time doubling the number of cells. Eventually a hollow ball of hundreds of cells (blastula) is produced, which then starts to differentiate. Magnification: x280 when printed at 10 centimetres wide. For a sequence showing division see P681/082-P681/084.

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Keywords: anatomy, animal body, biological, biology, blastomere, blastomeres, blue, cell, cells, developing, division, duo, echinoderm, echinoidea, embrology, embryo, fertilised, growing, light micrograph, light microscope, nature, pair, reproduction, sea urchin, sequence, two, two-cell, zona pellucida, zoological, zoology

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