Development Ch 29 – Flashcards
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which of the following statements about the trophoblast is false?
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is derived from the inner cell mass
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If fertilization occurs, the ________ is maintained because the embryo secretes ________.
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corpus luteum, homan chorionic gonadotrophin
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extramembryonic membrane gives rise to urinary bladder
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allantois (at atlantis have to pee)
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extraembyonic membrane forms the fetal portion of the placenta
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chorion
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fluid filled sac
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amnion
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germ layer forms the brain and spinal cord
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ectoderm
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where in the embryo does mesoderm first appear
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between the cell layers of the inner cell mass.
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oxygenated blood from the placenta returns to the fetus in the
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umbilical vein
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region known as the primitive streak is the site of
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migration of ectodermal cells to form the mesoderm
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Gastrulation
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three germ layers are formed.
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Initially, the nutrients absorbed by the trophoblast easily reach the inner cell mass by simple
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Diffusion
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The mesoderm and the trophoblast combine to form the
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chorion
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Ectoderm is to ____ as mesoderm is to____
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neural tissue, muscle tissue
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Shortly after gastrulation, the body and the organs of the embryo begin to form. This is
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embryogenesis
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a space opens within the inner cell mass that will form the
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amniotic cavity
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Under the influence of the trophoblast, maternal blood vessels in the endometrium
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break down and from lacunae
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During implanation
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the syncytial trophoblast erodes a path through the endometrium.
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Inner cell mass of the blastocytst will
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form the embryo
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A blastocysts is a
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hollow ball of cells
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Solid ball of cells
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morula
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nearly identical cells that are produced by early cleavages
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blastomeres
