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| the developing chick inside the egg. |
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The yellow, usually spherical portion of an egg of a bird or reptile, surrounded by the albumen and serving as nutriment for the developing young. |
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| A layer of cells on the inside of the blastula |
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A thin layer of tissue that covers a surface, lines a cavity, or divides a space or organ. |
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The white of the egg of certain animals, especially birds and reptiles, consisting mostly of the protein albumin. The albumen supplies water to the growing embryo and also cushions it |
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One of two spiral bands of tissue in an egg that connect the yolk to the lining membrane at either end of the shell. |
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empty space located at the large end of the egg; it is between the inner and outer shell membranes |
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A segmental mass of mesoderm in the vertebrate embryo, occurring in pairs along the notochord and developing into muscles and vertebrae. |
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The thin, membranous sac filled with a serous fluid in which the embryo or fetus is enclosed and suspended in the uterus. Also called amniotic sac |
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| A membranous sac that develops from the posterior part of the alimentary canal in the embryos of mammals, birds, and reptiles. It is important in the formation of the umbilical cord and placenta in mammals. Also called allantoid. |
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| A similar outer covering on an egg, fruit, or nut |
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The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta |
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The part of the ectoderm in a vertebrate embryo that lies on either side of the neural tube and develops into the cranial, spinal, and autonomic ganglia. |
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