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| Description: The amniotic egg contains the developing embryo and the four separate extraembryonic membranes that it produces: The innermost membrane is the amnion, which protects the developing embryo in a fluid-filled sac called the amniotic cavity. The yolk sac encloses a stockpile of nutrients, in the form of yolk, for the developing embryo. The allantois functions as a disposal sac for metabolic wastes. The chorion, along with the allantois, provides gas exchange between the embryo and the surrounding air. Picture Stats: Views: 9105 Filesize: 73.3kB Height: 736 Width: 850 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=940 |