dorsal_to dorsolateral placode In summary, the collective term 'placodes' refers to some rather different structures, probably with different evolutionary origins. Some sensory placodes (at least the otic and olfactory) may have homologues in basal chordates. Even if this is so, it is apparent that they were elaborated considerably during early vertebrate evolution. Epibranchial and dorsolateral placodes appear to be new; we infer that their origin depended on the evolution of specific inductive signals.[well established][VHOG] Lateral neurogenic placodes positioned dorsal of the epibranchial placodes. TAO:0001310 The only remaining dorsolateral placode in land vertebrates is the otic/octaval placode UBERON:0003067 VHOG:0000103 XAO:0000187 ZFA:0001310 dorsolateral placodes uberon epibranchial placode neurogenic placode