part_of part of part of only in taxon only_in_taxon Chordata head cranial placode FMA:293966 XAO:0000305 cranial placodes Do not merge with neurogenic placode placode UBERON:0002546 MAT:0000369 Comparisons of developmental gene expression suggest that the anterior ectoderm in amphioxus may be homologous to the vertebrate olfactory placode, the only vertebrate placode with primary, not secondary, neurons EFO:0001650 ectodermal cranial placode uberon ectodermal placode The term placode or placodes also applies to developing organs such as teeth, mammary glands, hair follicles, feathers and scales. We include a separate parent class for this. to avoid confusion, we include neurogenic placode as a subclass Ectodermal placode that develops in the head into a part of the sensory nervous system. With a few exceptions (lens, adenohypophyseal), cranial placodes are neurogenic. MIAA:0000369 AAO:0010466 ectodermal placode