The first pharyngeal groove produces the external auditory meatus ( ear canal ).
2.
Unlike modern cetaceans, basilosaurids retained a large external auditory meatus.
3.
The rest is provided by the auriculotemporal nerve, which supplies the skin anterior to the external auditory meatus.
4.
Mice knock-out models of the gene express defects in the tongue, nasal cavity, nasal pits, inner ear, and external auditory meatus.
5.
The facial nerve passes through the petrous temporal bone, internal auditory meatus, facial canal, stylomastoid foramen, and then the parotid gland.
6.
For the Conventional earpiece facebow, the anterior reference point is the nasion area, and the posterior references are the external auditory meatus.
7.
The practitioner must lengthen and elevate the patient s neck until the external auditory meatus is in the same plane as the sternum.
8.
The nervus intermedius exits the cranial cavity at the Internal auditory meatus, and joins with the motor root of the facial nerve at the geniculate ganglion.
9.
The posterior root, a prolongation of the upper border, is strongly marked; it runs backward above the external auditory meatus, and is continuous with the temporal line.
10.
The basilosaurid ear did, however, have a large external auditory meatus, strongly reduced in modern cetaceans, but though this was probably functional, it can have been of little use under water.
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