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| Description: On days 18 and 19, the heart begins to develop in the head end of the embryo. It begins in a region of mesodermal cells called the cardiogenic area. A pair of endocardial tubes forms. The tubes fuse to form a primitive heart tube. Picture Stats: Views: 213 Filesize: 1.01MB Height: 907 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40510 |