nasal placodes

na·sal plac·odes

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.
Synonym(s): olfactory placodes

na·sal plac·odes

(nāzăl plakōdz)
Paired ectodermal plates that come to lie in bottom of olfactory pits as they deepen by growth of surrounding medial and lateral nasal processes.
References in periodicals archive ?
The nasal placodes (olfactory placodes) arise from the medial aspect of the lower portion of the frontal prominence, and the lens placodes arise from the lateral aspect of the lower portion of the frontal prominence.
3) An accessory nasal placode may be present either above or below the normal nasal placode.
The nasal placodes develop as early as the third week of gestation.