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Pages: 345-348+450
Year: Issue:  4
Journal: Acta Anatomica Sinica

Keyword:  Microvascular architectureCerebral cortexMicrocirculatory unitArterioleVenule;
Abstract: The microvascular architecture in the cerebral cortex of the rats and guinea pigs was studied with the replica-SEM method. The brain microvasculature in both animals is similar to each other. The microvessels in the cerebral cortex of the animals may be divided into microcirculatory units. Each unit consists of one venule and 6 arterioles. In rat, the cortical venule is about 1100-1500nm in length, 40-45μm in diameter. It occupies the central axis of the unit. The cortical arteriole is about 800-1000μm in length, 18-20μm in diameter. It is located in the periphery of the unit. The distance between two .nearby arterioles is about 200μm, and that for venules is about 530μm. So the microcirculatory unit is a column with 6 sides. The drainge volume of one venule is about 0.2-0.3 mm~3 by counting. The diameter of the cortical capillaries are about 5.0-5.Sum. The distribution of the cortical capillaries is not all even, some denser capillary plexus and complex anastomose may be seen at the deeper cortex. Diameters of all arterioles are more than 8μm and possess a complete layer of smooth muscle in their wall. The precapillary sphincter is obvious. The significance of the microvasculature is discussed.
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