Nasal passages of the stage 18 embryo. The nasal epithelium shows specialized regions including the ethmoidal, maxillary, and choanal fields. The vomeronasal organ is present in section d. The nasomaxillary groove is commonly said to indicate the origin of teh nasolacarimal duct, but Politzer disagreed. A mesenchymal condensation now marks the primoridium of the median cartilaginous septum of the nose.  

 

O'Rahilly and Müller, 1987

 
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