Suslonova O V, Roshchevskaia I M
Morfologiia. 2005;128(5):45-7.
The working myocardium architecture was studied in heart ventricles of Wistar rats using the method of layer-by-layer dissection. Ventricle myocardium in the rat was found to be formed by three layers: superficial (subepicardial), middle and deep (subendocardial). The superficial and deep layers were present in both ventricles, while the middle one was found only in the left ventricle. The greatest variations were detected in the orientation of superficial layer muscle fibers: in the left ventricle subepicardial fibers had mainly a longitudinal arrangement, while in the right ventricle they were arranged transversely to the heart longitudinal axis. Most of the myocardial mass in the left ventricle, with the exception of the apex, was represented by a middle layer of circular fibers. In the deep layer, the fibers were oriented longitudinally, forming the trabeculae and papillary muscles.
采用逐层解剖法对Wistar大鼠心室的工作心肌结构进行了研究。发现大鼠心室心肌由三层组成：表层（心外膜下）、中层和深层（心内膜下）。表层和深层在两个心室中均存在，而中层仅在左心室中发现。表层肌纤维方向的变化最大：左心室心外膜下纤维主要呈纵向排列，而右心室中的纤维则与心脏纵轴横向排列。左心室除心尖外的大部分心肌质量由环形纤维中层构成。在深层，纤维纵向排列，形成小梁和乳头肌。
