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Facial (VII) nerve, Chordi Tympani, Vestibule  and basal turn of Cochlea.

Diagram: PSCC: Posterior Semicircular Canal; VII: Facial Nerve; CT: Chordi Tympani; Cochlea; Mastoid Air Cells; External Auditory Canal

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Ampulla of posterior semicircular canal.
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Round Window membrane and basal turn of the Cochlea.

Diagram:  PSCC: Posterior Semicircular Canal; RW: Round Window Membrane (light blue) and Cochlear Fenestra (Round Window Nitch); VII: Facial Nerve; CT: Chordi Tympani; TM: Ear Drum (Tympanic Membrane); EAC:  External Auditory Canal; CA: Carotid Artery: Cochlea (basal turn); Mastoid Air Cells.

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View Highest Resolution-Slide 376
Good View of the Cochlear Fenestra (Round Window Nitch) which leads to the Round Window Membrane
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