Abstract
Cranial placodes (Holland and Holland 2001; Bassham and Postlethwait 2005) are specialized areas of the head ectoderm of vertebrate embryos that typically first become apparent as patches of thickened, columnar epithelial cells. Placodes, with the exceptions of the neurohypophyseal and lens placodes, are neurogenic, differentiating into neurons as well as other cell types. Placode-derived tissues make a significant contribution to the visual, olfactory, acoustico-lateralis, and gustatory systems of all living vertebrates.
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Notes
- 1.
See Fig. 2.5 that shows this proximity of the two placodes during lamprey embryogenesis.
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Jankowski, R. (2013). Phylogenetic Origins of the Visual and Olfactory Organs. In: The Evo-Devo Origin of the Nose, Anterior Skull Base and Midface. Springer, Paris. https://doi.org/10.1007/978-2-8178-0422-4_15
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