Kawai Katsushi, Honma Satoru, Kumagai Yoshihiro, Koba Yoshikazu, Koizumi Masahiro
Department of Anatomy, Graduate School of Medical Sciences, Kumamoto University, Honjo, Japan.
Anat Sci Int. 2011 Sep;86(3):135-45. doi: 10.1007/s12565-010-0101-7. Epub 2011 Jan 19.
A retroesophageal right subclavian artery, arising from the arch of the aorta as the terminal branch and passing dorsal to the esophagus, was found in five (1.2%) of 428 bodies donated for student dissection at Kumamoto University between 1993 and 2008. The presence of a retroesophageal right subclavian artery has been generally explained to be caused by the persistence of the normally eliminated part of the right dorsal aorta caudal to the seventh intersegmental artery and the disappearance of the normally patent right fourth aortic arch and the part of the right dorsal aorta cranial to the seventh intersegmental artery during the developmental process. However, the parts which remain or disappear are different in each case. With the aim of determining the portions eliminated or persisting and thereby gaining an understanding of the developmental process of the retroesophageal right subclavian artery in each instance, we made schematic diagrams showing the various components of the embryonic aortic arch complex as the prototype just before the anomaly occurred. Based on these diagrams, we conclude that immediately preceding the disappearance of the distal part of the right dorsal aorta and the dorsal part of the right sixth aortic arch, the third intersegmental artery was situated opposite to the fourth aortic arch and the seventh intersegmental artery was situated cranial to the point of junction of the right and left dorsal aortae.
1993年至2008年间，在熊本大学用于学生解剖的428具捐赠尸体中，发现5例（1.2%）存在右锁骨下动脉走行于食管后方的情况，该动脉起自主动脉弓，为终末分支，走行于食管后方。右锁骨下动脉走行于食管后方这一情况，一般解释为在发育过程中，右背主动脉在第七节间动脉尾侧正常应消失的部分持续存在，而正常通畅的右第四主动脉弓以及右背主动脉在第七节间动脉头侧的部分消失。然而，每种情况下保留或消失的部分有所不同。为了确定消除或持续存在的部分，从而了解每种情况下右锁骨下动脉走行于食管后方的发育过程，我们绘制了示意图，展示异常发生前胚胎主动脉弓复合体的各个组成部分作为原型。基于这些示意图，我们得出结论，在右背主动脉远端部分和右第六主动脉弓背侧部分消失之前，第三节间动脉位于第四主动脉弓相对位置，第七节间动脉位于左右背主动脉汇合点头侧。
