Histoanatomical study of cerebrum and brain ventricles in quinea pig

Ten quinea pigs with 400-900 g weight were used in this study. After removal of cranium bones from brain, they were assessed from an anatomical point of view (biometry, appearance, weight, ventricles) and also at a histological framework with H&E, PAS and malory stainings. The results showed that the average length of cerebrum was equal to 2.41±0.048, the width of that at the thickest portion was equal to 1.21±0.027 and at the thinnest portion was 0.68±0.0034 cm. Also the thickness of cerebrum at the thickest and the thinnest was respectively equal to 1.21±0.023 and 0.72±0.0075 cm.The color of cerebrum was light redish. Gyri ans sulcus were absent. Cerebrum had a tip pointedshape like the tip of a pen. Pia mater with its related vasculature covers the surface of the brain. The preform lobes are very large. The average weight of cerebrum was equal to 3.4 g.. The lateral ventricle I and II were longe in caudal portion and in cranial have been directed downward with a severe deviation. The III &IV ventricles were wide, while sylvius duct is small. Histologically the pia mater is highly vascular and collagen fibers were detectable in it.The density of neurons at the molecular layer of the gray mater is low. This layer is completely differentiable from its down layers. External and internal granular layers were apparent, but the externalpyramidal layer is not obviously to the view. The internal pyramidal cells were represented very large. The depth of the grey mater had big cells named to betz cells.