SEM of two primordial egg cells

SEM of two primordial egg cells

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Credit: PROFESSORS P.M. MOTTA & S. MAKABE/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning electron micrograph of two primordial egg cells (blue), also known as primary oocytes, on the surface of the ovary of a developing embryo. The progenitors of these cells migrate from the yolk sac towards the developing gonads, the future ovaries, arriving at the end of the fourth week after fertilisation. At this stage they are known as oogonia. Some of them differentiate into primary oocytes and begin their first meiotic division. At birth a primary oocyte, known as a primordial follicle, consists of the ovum surrounded by a layer of flat epithelial cells. Magnification: x2840 at 6x7cm size. x1950 at 4.5x3.5cm.

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Keywords: anatomy, egg, embryo, embryo primordial egg, false-coloured, female reproductive system, germ cell, human body, oocyte, oogonia, ovary, ovum, primary oocyte, primordial egg, primordial egg cell, primordial germ cell, primordial in embryo, reproduction

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