The external auditory meatus is an acquisition of homeotherms that was developed independently in mammals and birds.
This area could reasonably correspond to the pin-hole meatus seen in cases ofsevere pulmonary stenosis.
In numerous mammals, the fossa subarcuata is a slot above and behind the internal auditory meatus that is occupied by the flocculus of the cerebellum.
This detaches from the surface and canalises to form the nasolacrimal duct from the medial corner of the eye to the inferior meatus in the nasal cavity.
It is located midway at the anterior edge of the middle nasal concha, directly above the atrium of the middle meatus.
Mice knock-out models of the gene express defects in the tongue, nasal cavity, nasal pits, inner ear, and external auditory meatus.
Most inhaled airflow travels between the inferior turbinate and the middle meatus.
Children may also present cases of abnormal auditory meatus and low ear implantation.
