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Figure 1a. Normal anatomy of the auditory apparatus. (a) Oblique coronal 3D VR CT image (anterior view) shows the pinna (P); the EAC, including the cartilaginous (CaEAC) and osseous (OsEAC) portions; the isthmus (Is); the middle ear cavity (ME); and the inner ear (IE). The middle ear is divided into the epitympanum (above dotted green line), mesotympanum (between dotted green and dotted yellow lines), and hypotympanum (below dotted yellow line). (b) Three-dimensional VR CT image (view from the dissected medial portion of the temporal bone) shows the inner ear, including the cochlea (Co), vestibule (Ve), superior semicircular canal (SSCC), lateral semicircular canal (LSCC), and posterior semicircular canal (PSCC). The internal auditory canal (IAC) and the bony canal for the facial nerve (FN) are also seen.
