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Carnegie Stage   Figure

Nasal passage

Nasal passage

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 the nasolacrimal duct, but Politzer disagreed. A mesenchymal condensation now marks the primordium of the median cartilaginous septum of the nose.

O'Rahilly and Müller, 1987.

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Keywords: choanal field, ethmoidal field, maxillary field, mesenchymal condensation around hindgut, nasal passage, nasal septum, nasolacrimal duct, nasomaxillary groove, olfactory nerve (CN I), primordium of the median cartilaginous septum of the nose, tongue, vomeronasal organ


Source: The Virtual Human Embryo.