part of part of in taxon connects connects Chordata naris galen:Naris MA:0000282 EMAPA:17847 in actinopterygians, both pairs of nares are external. In tetrapods, the exhalant empties into the buccal cavity EHDAA2:0001225 UBERON:0000003 SCTID:272650008 AAO:0000311 Orifice of the olfactory system. The naris is the route by which odorants enter the olfactory system[MAH]. we have classified this as an orifice, according to FMA. Note that in FMA, orifices are immaterial entities, but in ZFA this is a surface structure Naris refer to the external and interior naris (choana) of tetrapods, and to anterior and posterior naris of zebrafish. It seems now accepted that the structure is homologous: The choana, a unique 'internal nostril' opening from the nasal sac into the roof of the mouth, is a key part of the tetrapod (land vertebrate) respiratory system. It was the first component of the tetrapod body plan to evolve, well before the origin of limbs, and is therefore crucial to our understanding of the beginning of the fish-tetrapod transition. (...) Here we present new material of Kenichthys, a 395-million-year-old fossil fish from China, that provides direct evidence for the origin of the choana and establishes its homology: it is indeed a displaced posterior external nostril that, during a brief transitional stage illustrated by Kenichthys, separated the maxilla from the premaxilla.[well established][VHOG] VHOG:0000663 One of paired external openings of the nasal chamber.[AAO] EHDAA:9083 head orifice nasal cavity olfactory system