View of a 14.5 day old foetus of a rat

View of a 14.5 day old foetus of a rat

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Credit: DAVID SPEARS LTD/ SCIENCE PHOTO LIBRARY

Caption: Macrophotograph of a 14.5 day old foetus of a rat. The foetus is normally situated inside a fluid filled sac, which was here removed, known as the amniotic cavity. The fluid is mostly formed by water and protects the foetus against the pressure of the internal organs of the mother and from any injury from the mother's movements. The embryo of a rat attaches to the uterine cavity about 5 days after ovulation and the pregnancy lasts roughly 22 days. At centre right the tip of the developing tail is also visible. Magnification unknown.

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Keywords: 14.5 day old, anatomy, animal body, fetus, foetus, rat

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