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10 Cards in this Set
- Front
- Back
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What are pharyngeal arches homologous to?
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Branchial arches of fish and larval amphibians
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When do pharyngeal arches begin to appear in an embryo?
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The 4th week
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What arch of the pharyngeal arches is rudimentary in humans?
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The 6th arch
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What is the term for the primitive mouth?
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Stomodeum
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What arch is called the mandibular arch?
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1st Arch
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What lines the outer surface of arches?
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Single cell layer of ectoderm
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What is the primordium of the mandible?
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Meckel's cartilage
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What cells secrete hCG?
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Syncytiotrophoblast cells
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Where is the future sire of the mouth indicated by the thickening of cells at?
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Prechordal plate region of the hypoblast
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Where are the only places that the primitive streak cells do not migrate to?
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Prechordal plate and cloacal membrane
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