Fertilisation of a sea urchin egg

Fertilisation of a sea urchin egg

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Credit: MICHEL DELARUE, ISM/SCIENCE PHOTO LIBRARY

Caption: Fertilisation of a sea urchin egg, light micrograph. The female egg cell (ovum) is surrounded by numerous tiny male sperm cells (blue/green dots). Only one of these can penetrate the ovum's outer layer and release its genetic material into the ovum. After this, the outer layer rapidly becomes impermeable to other sperm cells. The sea urchin has long been used as a model organism in reproductive biology. This is a differential interference contrast image.

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Keywords: anatomy, animal body, biological, biology, cell, cells, circle, circular, circular circle circles, contrast, dic, differential interference, egg cell, female, fertilisation, fertilising, gamete, images, light micrograph, light microscope, magnified image, male, microscopic subjects, model organism, ovum, round, round shape rounded, sea urchin, sperm cells, spermatozoa, spermatozoon

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