Ramification and distribuition of the pulmonary trunk in relation to the bronchus in crossbred zebu cattle
Keywords:Pulmonary Artery, Bovine
AbstractIn this research we studied the ramification and distribution of pulmonary arteries. For this study we used 20 bovine zebu-like fetuses (13 male and 7 females), with ages varying from 06 to 09 months. The animals were fixed with formol 10% and the method of dissection consisted in the opening of the thoracic cavity and this allowed the individualization of arteries and bronchi. It was observed that usually, in 15 times (75%) the first collateral branch to leave the right pulmonary artery is the upward branch, followed by the downward branch, that join the two segmental bronchi from the tracheal bronchus, and respectively irrigates the cranial portion and the caudal lung lobe. Almost right after these structures the accessory lobar branch is followed by the middle lobar branch. The accessory lobar branch also appeared two times (10%) after the middle lobar branch, and 5 times (25%) at the same position of the middle lobar branch. Five preparations showed the first two branches of the right pulmonary artery emerging in form of a common branch, the cranial lobar branch. From the left pulmonary artery the first and second branches are 18 times (90%) the upward and downward branch. Two times (10%) these two branches came from a single collateral branch, the cranial lobar branch. A caudal lobar branch (right and left) enters each caudal lobe (right and left) and gives off a variable number of arterial branches (6 to 14) on the right side and (7 to 16) on the left side.
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