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Related Flashcards
Cards In This Set
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Embryo refers to what period of development?
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First 8 weeks
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Fetus refers to what period of development?
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9 weeks - term
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At ~3 weeks of development, the embryo consists of ______
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Ectoderm, mesoderm, endoderm(in a flat, 2-D disc that is spread over the yolk sac)
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3 parts of the mesoderm
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1. Paraxial mesoderm2. Intermediate mesoderm3. Lateral plate mesoderm
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Paraxial mesoderm
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Becomes divided into segments (somites) from which the skeletal muscles and some bones (e.g. vertebrae) develop
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Intermediate mesoderm
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Gives rise to parts of the GU system
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Lateral plate mesoderm
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Extends laterally as a plate of tissue on either side of the mesoderm
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Formation of the intraembryonic coelom
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Intercellular clefts appear in each lateral plate mesoderm, forming an outer somatic layer and an inner splanchnic layer, and coalescing to form the intraembryonic coelom
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Intraembryonic coelom gives rise to _________
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Peritoneal, pericardial, and pleural cavities.
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Define a serous membrane.
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A thin membrane that lines a body cavity that secretes watery fluid to keep the surface of the membrane moist.
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The serous membrane lining the peritoneal cavity is called the _________
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Peritoneum
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The serous membrane lining the pericardial cavity is called the ________
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Serous pericardium
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The serous membrane lining the pleural cavity is called the _________
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Pleura
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Each of the 3 serous membranes has an outer (______) layer and an inner (_______) layer
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Parietal Visceral
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____________ gives rise to the parietal layers of the serous membranes.
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Outer somatic layer of the lateral plate mesoderm
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