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 ?
Subsequently the depression develops in the surrounding mesenchyme on each side of the two nasal placodes to form the olfactory pits.
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.
The nasal placodes develop as early as the third week of gestation.