(17 February 1906[1] – 2 July 1993[2]) was an American physician, placentologist, and embryologist known for pioneering the study of early human embryos and the structure and circulatory system of the placenta.
Following graduation, she studied for a year at the University of Hamburg, then returned to the United States to attend the Yale School of Medicine.
She eventually spent nearly all of her career, from 1932 to her retirement in 1971, at the Institute — save for time during World War II, when she served as Assistant Chief of the Office of Medical Information of the National Research Council.
In addition to advances in imaging technology, Dr. Ramsey's teams pioneered exacting injection techniques and established the use of primate models to study human placental function.
[4] Dr. Ramsey's work also revealed how trophoblastic cells spread along the inner wall of the placental arteries, in a frequently cited image, "like wax dripping down a candle.
ISBN 0-03-086121-7 Placental Vasculature and Circulation: Anatomy, Physiology, Radiology, Clinical Aspects — Atlas and Textbook, with Martin W. Donner.