part of part_of part of part_of nose ectoderm-derived structure upper respiratory conduit olfactory apparatus chamber An anatomical chamber that is part of the olfactory apparatus, consisting of cavity walls (nasal epithelium and mucosal layers) and the space bounded anteriorly by the nares and posteriorly by the choanae, when these structures are present. FMA:265136 UBERON:0015788 uberon