ウシとブタの房室伝導系右脚の心室中隔内分岐

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　ウシとブタの房室伝導系の右脚を形態学的に検索した.肉眼的に,右脚は心室中隔の右側の心筋層内を下方へ,続いて前方へ進み,中隔縁柱を通過して右心室の側壁に達していた.右脚はそこで右心室の心内膜下プルキンエ線維網に拡がる多数の分枝に分岐していた.右脚の心室中隔部は心筋層内に埋没していたので,動脈下乳頭筋の基部から中隔縁柱の中隔付着部にいたるまでの右脚を連続切片として顕微鏡的に観察すると,11例中6例のウシと8例中5例のブタで1～4本の分枝が右脚から分岐していた.これらの分枝のうち,ウシの1本の分枝は心室中隔の心筋層内プルキンエ線維網に連絡し,ブタの1本の分枝は心筋層内プルキンエ線維網と固有心筋に連絡し,他の多くの分枝は心室中隔の固有心筋に連絡していた.The right limb of the atrioventricular conducting system in cattle and swine hearts was studied morphologically. Macroscopically, the right limb was shown to extend downward and forward within the myocardium of right side of the ventricular septum, then run through the septomarginal trabecula to the parietal wall of the right ventricle. It then divided into numerous twigs which spread out to the subendocardial Purkinje fiber network of the right ventricle. As the septal part of the right limb was embedded within myocardium, the limb in the region between the base of the subarterial papillary muscle and septal attachment of the septomarginal trabecula was observed microscopically using serial sections. One to 4 branches were given off from the right limbs in 6 of 11 cattle and in 5 of 8 swine. One of these branches in cattleconnected to the intramyocardial Purkinje fiber network, and another branchi in swine to the intramyocardial Purkinje fiber network and ordinary cardiac muscle fibers. The other many branches connected to ordinary cardiac muscle fibers of the ventricular septum.
宮崎大学農学部の論文

ウシとブタの房室伝導系右脚の心室中隔内分岐

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