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Changes in semicircular canal morphology in response to selective breeding for high voluntary wheel running

Variation in semicircular canal (SCC) radius of curvature (R) and shape show correlations with locomotor agility among species of mammals. We used laboratory mice from 4 replicate lines bred for high voluntary wheel running (HR) and 4 non‐selected control lines (C) to examine responses in the SCC to 8 weeks of access to wheels and 21 generations of selection. Mouse crania were μCT scanned at 21 μm resolution and linear measurements, 3D landmarks, and centroid sizes of the SCC were taken. Linear measures were used to calculate R for all three canals and their mean, whereas landmarks were used to generate multivariate descriptors of 3D canal shape.