caa a22 4500 477095615 CHVBK 20180405111526.0 cr unu---uuuuu 170330e19960501xx s 000 0 eng 10.1007/BF00185881 doi (NATIONALLICENCE)springer-10.1007/BF00185881 Development of cardiac musculature in the cranial vena cava of rat embryos [Elektronische Daten] [Hideki Endo, Kenji Ogawa, Masamichi Kurohmaru, Yoshihiro Hayashi] Development of cardiac musculature in the rat cranial vena cava (common cardinal vein or duct of Cuvier) was examined by immunohistochemistry and transmission electron microscopy. Undifferentiated cardiac myocytes were detected in the cranial vena cava wall of rat embryos after 12.5 days post-coitum (dpc). The tunica media of the cranial vena cava was composed of cardiac myocytes after formation of the endothelium. Therefore, the cranial vena cava may be not only a part of the venous system but also of the heart. Myocytes in the cranial vena cava contained developing myofibrils, mitochondria and intercalated discs similar to those found in the myocytes in the heart. Striated myofibrils began to differentiate as soon as myocytes appeared in the vena cava wall, and myocytes with differentiating myofibrils occur in the wall as the first component of the tunica media at 12.5 dpc. We concluded that the cardiac musculature in the vena cava is not a secondary extension into the tunica media after birth only in the rat, but a basic structure formed in all mammals during early embryonic development. Springer-Verlag, 1996 Common cardial vein nationallicence Cardiac myocyte nationallicence Tunica media nationallicence Tropomyosin nationallicence Conducting myocyte nationallicence Endo Hideki Department of Zoology, National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku-ku, 169, Tokyo, Japan aut Ogawa Kenji Laboratory Animal Research Center, The Institute of Physical and Chemical Research (RIKEN), 351-01, Saitama, Japan aut Kurohmaru Masamichi Department of Veterinary Anatomy, Faculty of Agriculture, The University of Tokyo, 113, Tokyo, Japan aut Hayashi Yoshihiro Department of Veterinary Anatomy, Faculty of Agriculture, The University of Tokyo, 113, Tokyo, Japan aut Anatomy and Embryology Springer-Verlag 193/5(1996-05-01), 501-504 0340-2061 193:5<501 1996 193 429 https://doi.org/10.1007/BF00185881 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00185881 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Endo Hideki Department of Zoology, National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku-ku, 169, Tokyo, Japan aut NATIONALLICENCE 700 1- Ogawa Kenji Laboratory Animal Research Center, The Institute of Physical and Chemical Research (RIKEN), 351-01, Saitama, Japan aut NATIONALLICENCE 700 1- Kurohmaru Masamichi Department of Veterinary Anatomy, Faculty of Agriculture, The University of Tokyo, 113, Tokyo, Japan aut NATIONALLICENCE 700 1- Hayashi Yoshihiro Department of Veterinary Anatomy, Faculty of Agriculture, The University of Tokyo, 113, Tokyo, Japan aut NATIONALLICENCE 773 0- Anatomy and Embryology Springer-Verlag 193/5(1996-05-01), 501-504 0340-2061 193:5<501 1996 193 429 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer