Category:Carnegie Embryo 763

Carnegie embryo first described by Mall in 1915 survey of Carnegie Collection^[1]

Normal Embryos in the Uterus

"In our own collection we have a specimen about the size of Herzog's or Peters's with practically the same intervillous hemorrhage. The specimen (No. 763) is somewhat more advanced than either of the two others; it was obtained from uterine scrapings and appears to be normal in every respect. However, in later stages it does not appear as though the hemorrhage is as pronounced as in some of the earlier specimens studied. In fact, this point has been commented upon frequently, and it is usually stated that the absence of blood between the villi is due to contraction of the uterus when the entire organ is removed at operation or to ruptured intervillous spaces when the specimen is obtained from the abortion. It has always seemed to me probable that in the latter instance the rupture has allowed the blood to enter instead of escape and that in the former it is very remarkable that the contraction of the uterus should have pressed out the blood corpuscles and allowed the blood plasma to remain. At any rate, in older specimens which have been examined in situ it is difficult to show that an intervillous circulation exists. Some embryologists have overcome this possibility by stating that intervillous circulation is a condition peculiar to the second half of pregnancy. After examining several well-preserved specimens in situ, I am convinced that this question is by no means settled, and must still be regarded as open."

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