Study On Microvasculature Of Lung In Bactrian Camel

The microvasculature of the lung in the Bactrian camel(Camelus bactrianus) was studied with the replicascanning electron microscopic method.The results showed that the microvessels of the lung arranged densely,branched and coursed regularly,of which the corrosion casts revealed a complex three-dimensional network completely.According to the microvascular architecture,the subpleural microvasculature mainly comprised the arteriole,the terminal arteriol e,the precap ii lary arteriole,and the capillary. Sometimes,the terminal arteriole directly gave rise to large number of capillaries which anastomosed with each other.forming the subpleural capillary network.The network was loose,in which the diameter of the mesh was larger than that of the capillary,and the mesh was often hexagon and pentagon in appearance.The resources of the alveolar capillary were rich,which originated from the capillaries of the subpleural space or interlobular septulum,sometimes from the precapillary arterioles or from the terminal arterioles directly.The alveolar capillaries anastomosed with each other and formed a single layer of dense network,surrounding the alveolar,the diameter of its mesh being larger than that of the capillary.The mesh of the alveolar capillary network was irregular polygon in appearance,but oval and elliptical mesh was much more.Plenty of collapsed alevolar capillaries were found in alveolar microvascular architecture of the lung in the Bactrian cainel.There are obvious imprints of the smooth muscles on the surface of the casts of the arteriole,the terminal arteriole and the precapillary arteriole.On the surface of the casts of the precapillary arteriole and the capillary,there are obous imprints of the endothelial nuclei as well.Numerous am tomoses on different orders were found between the pulmonary microvasulatures and the bronchial microvasculatures.