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Observation the Histological Structure and Distrbution of Bronchial Arteries of the in Different Age Yak(Bos Grunniens)

Author: MaXingBin
Tutor: CuiYan
School: Gansu Agricultural University
Course: Basic Veterinary Science
Keywords: Yak Lung Bronchial artery Organizational structure
CLC: S823.85
Type: Master's thesis
Year: 2011
Downloads: 13
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Abstract


Use of histological methods were observation and analysis of the organizational structure of different age yak lung bronchial artery in order to explore the structure of the yak bronchial artery of adaptation to high altitude hypoxia environment . Yak bronchial artery almost issued from the thoracic aorta ventral branch emitted into the lungs door is mainly distributed in the outer membrane of the bronchial wall and the lamina propria , pleura, interlobular septa , hilar lymph adventitia of the pulmonary artery and pulmonary vein , the vagus nerve sheath and tracheal glands around . The the extrapulmonary bronchial artery endothelial lower observed a very small amount of longitudinal smooth muscle bundles , sometimes the internal elastic lamina bifurcation and wrapped around these longitudinal smooth muscle bundles . Longitudinal smooth muscle bundles immediately intimal distribution grow older , gradually increasing to adulthood in the membrane, can be extended to the intimal thickening in membrane thinning ; 1 -day-old , 5 -month-old 1 year of age and the adult yak lungs bronchial artery overall average film thickness of the outer diameter of the percentage (MT%) were 28.01 ± 10.65% , 29.81 ± 11.17% , 34.05 ± 10.87% and 33.30 ± 11.03%, a year-old age group the highest ; same age , less than 50μm arterial MT% mean maximum ; bronchial artery diameter were 14.88 ± 3.87μm ( 1 -day-old group ) , 17.18 ± 3.10μm ( 5 -month-old group ), 17.70 ± 3.23 μm ( 1 -year-old age group ) and 17.54 ± 1.87μm ( adult ) , presence of medial smooth muscle , and can still be observed in the continuous internal elastic lamina . These results indicate that with increasing age , the effect of hypoxia on the yak lung bronchial artery remodeling is more significant , especially bronchial artery diameter less than 50 μm greatest impact . The authors believe that the structure of the reconstruction of the the bronchial arterial wall smooth muscle caused by the thickening of the bronchial artery membrane , increasing arterial wall smooth muscle is the alteration of a hypoxic environment adaptability structure .

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CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > Livestock > Cow > Variety > Yak
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