Fig. 2.

(A) Surface of the bony labyrinth with anterior, lateral and posterior semicircular canal (ASC, LSC, PSC), oval window (OW), round window (RW), cochlea (CO) and vestibule (V). (B) The same surface, closed and smoothed. (C) Midline skeleton. (D) 3D coordinates measured along medial axis; arrows show the measurement direction for each curve. (E) Cross-section through ASC showing a coordinate on the tip of the oval farthest away from the vestibule. (F) Outer curve along a semicircular canal. (G) Semilandmarks of the outer curve are not placed on the irregular fill-in of the foramen for the posterior ampullar nerve (white arrow). (H) Semilandmarks on the common crus. (I) Coordinates along the OW, measured clockwise from 1. (J) Coordinates along the cochlea outline; 1 – cochlear side of RW. (K) Midline of the cochlea measured using slices perpendicular to the outer cochlear curve as a guide (white arrow shows landmark with which the slice is aligned). (L) Raw coordinate measurements. Interior landmarks are in red, exterior landmarks in purple, and semilandmarks in orange.