horizontal fissure of cerebellum


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hor·i·zon·tal fis·sure of cer·e·bel·lum

(hōr'i-zon'tăl fish'ŭr ser'ĕ-bel'ŭm)
Horizontal fissure that divides the ansiform lobule into its major parts, crus I (superior semilunar lobule) and crus II (inferior semilunar lobule).