Word: embryologist
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Frank Rattray Lillie, embryologist (University of Chicago), director of Marine Biological Laboratory (Woods Hole. Mass.) Sc.D...
...Bradley Merrill Patten, embryologist of Western Reserve University, showed a film, taken with a special microscopic lens, of the heart of an unhatched chicken. Twenty-nine hours after incubation, five days before the formation of any nerve tissue, the heart began to beat. The beat began in the portion of the heart which later became the right ventricle, not in the "pacemaker" portion, where begin the normal beats of a fully developed heart. The pictures showed that before the formation of any chambers the heart is a straight tube with no indentations. Later it twists upon itself, becomes U-shaped...