LM of mature human oocyte (metaphase I stage)

LM of mature human oocyte (metaphase I stage)

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Caption: Light micrograph of a mature human oocyte (egg), photographed at the metaphase I stage of its second meiotic division. This second meiotic division is not completed until after penetration of the ovum by a single spermatozoon - that is, until fertilisation occurs. In this image, a single spermatozoon is visible at the 10 o'clock position, in the process of penetrating the corona radiata, a layer several cells thick which surrounds the oocyte. A further barrier to sperm, the Zona pellucida, directly envelops the oocyte beneath the corona radiata.

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Keywords: anatomy, black and white, black-and-white, circle circles, egg, female reproductive system, human body, human oocyte, images, light micrograph, magnified image, metaphase, microscopic photos, monochrome image, ovum, polar body, reproduction, round shape, rounded circular, subjects

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