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Fig. 2 | Head & Face Medicine

Fig. 2

From: Morphological relationships between external auditory canal and vital structures of tympanic cavity

Fig. 2

Evaluation of external auditory canal morphology. A Shows a 3D (A-â‘ ), axial (A-â‘¡), and coronal slice (A-â‘¢) images of the external auditory canal indicating the tympanic umbo as the point U. B Shows a 3D image (B-â‘ ), slices passing the short diameter of the bony tympanic ring (slice X, A-â‘¡), and the long diameter of the bony tympanic ring (slice Y, A-â‘¢) from a view where the tympanic membrane can be confirmed best using MIP processing by rotating visual axis arbitrarily around the point U. B Also shows the antero-posterior (g) and superior-inferior (h) length of the external auditory canal in the bony tympanic ring and the angle of the external auditory canal curvature (anterior wall, i; posterior wall, j; and inferior wall, k). For the angle of the external auditory canal curvature, the angle of the line connecting the point at the entrance of the external auditory canal bone, the most protruding point, and the tympanic ring was measured

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