Neural ectoderm, neural crest, and placodes: Contribution of the otic placode to the ectodermal lining of the embryonic opercular cavity in Atlantic cod (Teleostei)

Journal of Morphology
Tsutomu MiyakeBrian K Hall

Abstract

Development of neural ectoderm, neural crest, and otic placode with special reference to a new placodal derivative, the ectodermal lining of the opercular cavity, is described in a teleost fish, the Atlantic cod Gadus morhua, from a stage-by-stage examination of embryonic development. The ectodermal lining of the opercular cavity forms by invagination of the otic placode. The neural plate "infolds" by a wave of cellular rearrangement that transforms the neural plate into a neural rod. This transformation creates a distinct dorsal ectodermal cell layer. When the neural rod is arranged as monostratified columnar cells in the forebrain and midbrain, dorsal ectoderm at the midbrain level thickens lateral to the neural rod to form a cell cluster-the presumptive neural crest and placode. Upon migration of the neural crest from the postoptic midbrain, the dorsolateral area of the dorsal ectoderm thickens and segregates from the neural crest as a placode that is continuous with the presumptive lens placode. As the neural crest migrates from the hindbrain, this placode extends along the hindbrain as a single continuous cluster of cells. At the onset of formation of the lens placode, this continuous placode becomes the placode in the pos...Continue Reading

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Citations

Jul 14, 2019·Scientific Reports·Joana Teixeira RosaAnn Huysseune
May 18, 2001·Developmental Biology·G Schlosser, R G Northcutt
Mar 20, 2001·Developmental Biology·C V Baker, M Bronner-Fraser
Sep 11, 2002·Developmental Biology·Andrea Streit
Dec 15, 2005·Zoology : Analysis of Complex Systems, ZACS·Gerhard Schlosser

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