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.

Placode

the rudiment of a sense organ or ganglion in humans, vertebrates, and some invertebrates. Placodes are paired thickenings of the outermost embryonic germ layer, the ectoderm; they arise as the nervous system is laid down in the early stages of embryogeny. In vertebrates, placodes give rise to the olfactory organ, the crystalline lens of the eye, the inner ear, the auditory ganglion, and the ganglia of the facial, glossopharyngeal, and vagus nerves. In cyclostomes, fishes, and many amphibians, placodes give rise to the lateral-line organs in addition to the aforementioned structures.

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No references found			1) They are derived from different embryologic cell anlages: the epibranchial placode of the second branchial arch and the neural crest of the facial primordium, respectively. The meatal ganglion in neoplasia and inflammation of the facial nerve by Gacek, Richard R. / Ear, Nose and Throat Journal ISOLATION OF OLFACTORY ENSHEATHING CELLS FROM OLFACTORY BULB AND OLFACTORY MUCOSA OECs develop from the olfactory placode and subsequently migrate into the olfactory nerve and OB. Potential of olfactory ensheathing cells for cell-based therapy in ... by Radtke, Christine; Sasaki, Masanori; Lankford, Karen L.; Vogt, Peter M.; Kocsis, Jeffery D. / Journal of Rehabilitation Research & Development Vertebrates have three types of embryonic tissue not present in invertebrates: neural crest cells, ectodermic placodes, and a modified paraxial mesoderm. Jump-start for the vertebrates; new clues to how our ancestors got a ... by Monastersky, Ronald / Science News			placenta accreta placenta previa Placenta, Artificial placental barrier Placentation Placentia Placentia Bay Placer placer claim Placer County placer deposit placer dredge placer location placer mining Placerita Canyon State Park placeshifting Placetas placic horizon Placid Lake State Park Placid, Lake Placidia Placido Plácido placing placita Placode Placodermi Placodontia Placoid Scale Placothuriidae Placzek, Adolph K. Plafond Plagal Cadence plage Plaggept plagiaplite Plagiarism Plagiaulacida Plagiaulacidae plagiocephaly Plagioclase plagioclase feldspar plagioclimax plagiodont plagiogravitropism plagiohedral plagionite Plagiosauria plagiosere Plagiotropism PLAGO			Placing an Issue placing in confinement placing in office Placing Labor in Unique Trade Opportunities placing reflex placing reflex placing reflex placing reflex placing response placing response placing response placing response Placing the Issue Placing the Issue Placing the Issue Placing the Issue Placing the Issue placings placings placings placings Placit placita Placitory Placitum Placitum Plack placket plackets Placobdella Placode placoderm placoderm Placodermal Placodermata Placodermi Placodermi Placoderms Placoderms placodes Placodont Placodontia Placoganoid Placoganoidei placoid placoid Placoid fish Placoid fish Placoid fishes Placoid fishes Placoid scale Placoid scale Placoides Placoides placoidian Placophora Placothuriidae Placque Placque Placque PLACS

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