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Figure 6. Normal anatomy of the cochlea. Three-dimensional VR CT image (inferolateral view after dissection of a portion of the inferior wall of the cochlea) shows the osseous spiral lamina (SL), which divides the bony canal for the cochlea into upper and lower passages, the scala vestibule (SV) and the scala tympani (ST), respectively. Dissection of the apical cochlear bony labyrinth shows the terminus of the spiral lamina as a conical projection, or hamulus (Ha), allowing free communication between the scala vestibule and the scala tympani at the helicotrema (He). OW = oval window, RW = round window.
