abnormal respiratory system development abnormal craniofacial development abnormal olfactory system morphology abnormal nasal placode morphology MP:0006292 MPheno.ontology abnormal olfactory placodes any structural anomaly in the paired ectodermal placodes that come to lie in the bottom of the olfactory pits as the pits are deepened by the growth of the surrounding medial and lateral nasal processes; the nasal placode gives rise to the olfactory epithelium of the nose olfactory placode dysplasia