The eustachian tube, also known as the auditory tube, which links the middle ear with the nasopharynx, has its entrance in the front (anterior) wall. The bone otic capsule of the inner ear includes the inner (medial) wall, often known as the labyrinth, which divides the middle ear from the inner ear.
It is the primary muscle that opens it upon contraction since it also derives some of its origin from the auditory canal. The middle ear cavity and the nasopharynx are connected by the eustachian tube (pharyngotympanic tube). The middle ear system is aerated, and the nasopharynx is cleared of middle ear mucus. Communication with the tympanic cavity is made possible by the delicate caroticotympanic canaliculi for nerves and arteries. The auditory tube's tympanic opening is located in the upper portion of the anterior wall. This is the tube that joins the middle or inner ear to the outer ear.
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