And they have something in their outer ears that we're supposed to clean out of ours : a thick plug of wax that keeps sea water from pushing into their auditory canals.
22.
In humans, the chief trace of their existence is the eustachian tube and auditory canal which ( interrupted only by the eardrum ) connect the pharynx with the outside of the head.
23.
The tumor may develop within the auditory canal, where the vestibulocochlear nerve which supplies the inner ear penetrates the skull ( intracanalicular neuroma ) or outside the canal ( extra-canalicular neuroma ).
24.
If the process continues pus penetrates the capsule and invades the surrounding tissue, and extends downward into the deep facial planes of the neck, backward into the external auditory canal, or outward into the facial skin.
25.
Sneezing is usually caused by foreign particles irritating the nasal mucosa, but can more rarely be caused by sudden exposure to bright light ( called the photic sneeze reflex ) or touching the external auditory canal.
26.
In rare cases patients may develop vision and / or hearing loss due to compromise of the optic nerves and / or auditory canals, which is more common in patients with McCune-Albright syndrome associated growth hormone excess.
27.
Stenvers projection taken to demonstrate internal auditory canal and temporal bones . anterior projections . 12 degree cephalad angulation, with head rotated 45 degrees from AP . With patient head in RPO position, CR is directed below left zygoma and centered to mastoid.
28.
It may also compress the labyrinthine artery ( main artery supplying the vestibular apparatus and cochlea of the inner ear ) which passes through the auditory canal, resulting in ischemia or infarction ('heart attack'of the ear, resulting in death of the supplied tissue ).
