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placode |
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placode [′pla‚kōd] (embryology) A platelike epithelial thickening, frequently marking, in the embryo, the anlage of an organ or part. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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2) In 1987, Reddy and Rao reported a case of a third nostril that was situated below the left nostril; they hypothesized that the extra nostril arose as a result of an accessory placode or pit. Vertebrates have three types of embryonic tissue not present in invertebrates: neural crest cells, ectodermic placodes, and a modified paraxial mesoderm. It becomes more superficial and rostral as it proceeds ventrally, and it ends adjacent to the deep surface of the epibranchial placode on the dorsal and caudal aspect of the first branchial groove. |
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