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nasal placode |
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nasal placode, an oval area of thickened ectoderm on either ventrolateral surface of the head of the early embryo, constituting the first indication of the olfactory organ. placode a platelike structure, especially a thickening of the ectoderm marking the site of future development in the early embryo of an organ of special sense, e.g. the auditory placode (ear), lens placode (eye) and olfactory placode (nose). lens placode the ectodermal thickening which develops into the lens vesicle and later the lens. nasal placode one of a pair of ectodermal thickenings which are the forerunners of the external nares and nasopharyngeal epithelium. olfactory placode an ectodermal thickening of the embryo which ultimately provides the sensory nerves for the olfactory region of the nasal mucosa. otic placode one of the pair of ectodermal thickenings in the vertebrate embryo which invaginates and is a major contributor to the internal ear. 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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