A, Neuron count was significantly reduced in the distal WM tracts of hypoxic animals compared with normoxic animals (P = .03) and control animals (P = .01) per high-powered field, which was defined at 4 mm2 (C). Neuronal density was similar between normoxic (B) and control (D) animals (P = .19). Each data point represents 1 animal. Horizontal lines represent median values. Scale bar: 100 μm and inlay, 20 μm. E, Thickness of the cerebellar external granular layer was significantly increased in hypoxic animals compared with normoxic (P < .01) and control animals (P <.01) (G). External granular layer was similar thickness in normoxic (F) and control animals (P = .70) (H). Each data point represents 1 animal. Horizontal lines represent median values. Scale bar: 100 μm and inlay, 20 μm. HPF, High-powered field.