Architecture Of Subpleuralmicrovessel Via Venous Cast In Yak And Sheep

The architecture of Subpleuralmicrovessel of the lung in yak and sheep was studied with the scanning electron microscopic method. The result showed that the architecture of subpleuralmicrovessel in yak and sheep was basic consistent. The subpleural vascular network was dense; on its surface, there were microvessels of the pleural surface. The microvessel of the pleural surface was gross sparse and proceeded far. Sometimes, the microvessel could span several pulmonary lobules. The branches of subpleural vascular formed subpleural vascular network. According to the converged sequence, four rank microvessels could be discriminated; they were capillary, postcapillary venule, collecting venule and venule. The capital converged pattern of microvessels was capillary→postcapillary venule→collecting venule→venule. Except for this, the capillary could straight converge to the collecting venule or venule. The shape of subpleural capillary network was diverse, and the mesh was thick. Generally, the aperture was all bigger than the capillary caliber. On the subpleural capillary cast surface, there were many constrictions as being caused by circular bands of smooth muscle cells. The quantity of constrictions was different, usually assumes the stage distribution, and caused the outward of vascular appearance to present the string of bead-like. There were imprints of the endothelial nuclei on the cast surface of the subpleural vascular and capillary in yak and sheep. The microvessel on the pleural surface and the subpleural vascular network anatomized each other on the pleural surface.