Normal microvasculature in non-blast exposed adult rat brain. Examples of normal cerebral microvessels from control rats not exposed to blast overpressure injury are shown cut in cross section (A-D) or longitudinally (E). Note the circular lumens, intact endothelial cells and smooth vascular walls. An endothelial cell nucleus is indicated by an asterisk in panel A. The nuclei of neurons (N) are labeled in panels A and D. Scale bars: 6 μm A-D; 15 μm E.