Amniotic membrane (AM) or amnion is a thin membrane on the inner side of the fetal placenta; it completely surrounds the embryo and delimits the amniotic cavity, which is filled by amniotic liquid. At the 32-cell stage the embryo is known as a morula (L. “mulberry”), a solid ball consisting of an inner cell mass and an outer cell mass. The amnion, or inner amniotic membrane, surrounds the embryo itself, enclosing the aqueous environment that the embryo develops in to protect the embryo from mechanical shock and support hydration; The chorion. The basement membrane (BM) is a special type of extracellular matrix that lines the basal side of epithelial and endothelial tissues. While the inner amniotic membrane surrounds the embryo itself, the chorion surrounds the embryo and yolk sac. It is a jelly like colourless fluid when fresh and turns white when cooked. yolk - the yellow, inner part of the egg where the embryo will form. 3.The amnion is filled with amniotic fluid that holds the embryo in suspension, while the chorion also acts as a protective barrier during the embryo… The following are printouts on chicken development to label: Chicken Egg (simple version) While the outer membrane adheres to the eggshell, the inner membrane surrounds the albumen — more colloquially known as the egg white. 2. Albumen/Egg white The albumen forms about 55-60% of the total egg content. The inner cell mass will eventually become the embryo and fetus, while the outer cell mass will eventually become part of the placenta. 2.The amnion is the inner membrane that surrounds the embryo, while the chorion surrounds the embryo, the amnion, and other membranes. The ball of now tightly bound cells starts to secrete fluid and organize themselves around a fluid-filled cavity, the blastocoel. The two membranes provide an efficient defense against bacterial invasion and are made partly of keratin. The inner membrane gives a one-two punch to the bacterial and gas sorting capabilities of the egg. Outer shell membrane 3. The outer membrane sticks to the egg shell while the inner membrane sticks to the albumen. vitelline (yolk) membrane - the membrane that surrounds the yolk. In recent years, the structure and function of the amnion have been investigated, particularly the plu … At this stage of development, the inner cell mass consists of embryonic stem cells that will differentiate into the different cell types needed by the organism. The amnion protects the embryo from mechanical shock and supports hydration. Blastocyst Formation Compaction Inner shell membrane These two membranes -- outer and inner -- are just inside the shell surrounding the albumen (white). At this developmental stage, the conceptus is referred to as a blastocyst. The first of these to be formed is the yolk sac, which is an endoderm-lined membrane that surrounds the blastocoel; the blastocoel now is called the yolk sac cavity (Figures 10.3 and 10.4). Likewise, inner membranes are the second translucent protein barrier tucked right after the outer membrane. The trophoblast will contribute to the placenta and nourish the embryo. The inner cell mass is also known as the embryoblast; this mass of cells will go on to form the embryo. Outer shell membrane; Inner shell membrane – These two membranes – outer and inner – are just inside the shell surrounding the albumen (white). The yolk contains the food that will nourish the embryo as it grows. The chorion facilitates exchange of oxygen and carbon dioxide between the embryo and the egg’s external environment. The outer membrane sticks to the egg shell while the inner membrane sticks to the albumen. The air in the air space is used by the developing embryo during incubation. The inner membrane is about 0.015mm thick and the outer one is about 0.05mm thick. The two membranes provide an efficient defense against bacterial invasion and are made partly of keratin. The inner cell mass produces three of the four extraembryonic membranes. Within this structure, a group of cells forms into an inner cell mass, which is fated to become the embryo.

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