Figure 1

Outline of MRI morphometric calculations on midsagittal images midsagittal T2-weighted MRI of horse CA5 (A). The cerebellum, its surrounding CSF space and the whole brain were outlined manually and the ratio of the area of the cerebellum and the area of the cerebellum plus its surrounding CSF space (checkered pattern) was calculated (B). To obtain the relative cerebellar size, the area of the cerebellum was put into a ratio with the area of the whole brain (irregular pattern) (C).