以房室结动脉主干为界，其下方毛细血管密度较大，其上方及前方较小。
The capillary density in the lower part of the main trunk of the atrioventricular node artery was greater than that in the upper and anterior parts.
以房室结动脉主干为界，其下方毛细血管密度较大，其上方及前方较小。
The capillary density in the lower part of the main trunk of the atrioventricular node artery was greater than that in the upper and anterior parts.
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