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posterior nasal aperture

^ http://purl.obolibrary.org/obo/UBERON_0004771

Opening/conduit between the nasal cavity and the nasopharynx[AAO] The choanae are separated by the vomer[WP]. [ http://en.wikipedia.org/wiki/Posterior_nasal_apertures AAO:0000093 ]

Synonyms: posterior nasal apperture

Term info

database cross reference
Subsets

pheno_slim

plural term
choanae [ VHOG:0000545 ]

UBPROP 0000001

One of the paired openings from the nasal cavities into the pharynx. [Bemis_WE, Functional_Anatomy_of_the_Vertebrates:_An_Evolutionary_Perspective, Glossary_G-6, Grande_L, Liem_KF, Third_Edition_(2001)_Orlando_Fla.:_Harcourt_College_Publishers, Walker_WF][VHOG], Opening between the nasal cavity and the nasopharynx.[AAO]

UBPROP 0000003

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]

UBPROP 0000008

In addition to tetrapods, the lungfish has internal nostrils too. In tetrapods the exhalant nostril (choana) empties into the buccal cavity., Fish don't have choanae, instead they have two pairs of external nostrils

depicted by

http://upload.wikimedia.org/wikipedia/commons/8/87/Gray855.png

has related synonym

choanae, posterior choana, posterior naris, nasopharyngeal naris

has broad synonym

internal naris, choana

id

UBERON:0004771

prefLabel

Posterior nasal aperture

Term relations

Equivalent to: