Marino T A, Severdia J B
Cell Tissue Res. 1982;221(3):597-605. doi: 10.1007/BF00215703.
The different segments of the embryonic heart tube of the ferret were examined with light and transmission electron microscopy. The cells of bulbus cordis, bulboventricular junction, primitive ventricle, atrioventricular junction, and primitive atria were in the process of differentiating into myocardial cells. The ventricular muscle cells were the most developed cells; the least mature muscle cells were those located at the arterial and venous ends of the heart tube. The cells between the ventricle and the two ends of the heart tube showed a spectrum of developmental stages, especially with respect to the morphological development of the myofibrils. Other organelles as well as surface specializations did not permit a distinction between cells of the different regions of the heart tube. There was no striking difference in the size and shape of the developing muscle cells of the atrioventricular and bulboventricular junctions compared to the developing ventricular muscle cells. Morphologically there was no evidence to suggest that the tissue of the atrioventricular and bulboventricular rings was specialized or different from any of the other segments of the single heart tube of the embryonic ferret.
利用光学显微镜和透射电子显微镜对雪貂胚胎心脏管的不同节段进行了检查。动脉圆锥、球室交界处、原始心室、房室交界处和原始心房的细胞正在分化为心肌细胞。心室肌细胞是发育最成熟的细胞；最不成熟的肌细胞位于心脏管的动脉端和静脉端。心室与心脏管两端之间的细胞呈现出一系列发育阶段，尤其是在肌原纤维的形态发育方面。其他细胞器以及表面特化结构无法区分心脏管不同区域的细胞。与正在发育的心室肌细胞相比，房室交界处和球室交界处正在发育的肌细胞的大小和形状没有显著差异。从形态学上看，没有证据表明房室环和球室环的组织与胚胎雪貂单心脏管的任何其他节段有特殊之处或不同。
