Lemos V P, Leal T J
Arq Neuropsiquiatr. 1977 Sep;35(3):235-8. doi: 10.1590/s0004-282x1977000300007.
This neuroanatomic study has been performed to establish the frequency of potencials anastomosis in the posterior portion of the cerebral arterial circle in 87 brains from northeasterner brazilians without any aparent clinical manifestations of neural dysfunction. The fetal pattern of the posterior communicating branch was present in the 46% (40/87) of the cases. The frequency with regard to side was the following: 21,8% (19/87) on the right side; 12,8% (12/87) on the left side and 10,4% (9/87) bilateral. The bilateral and unilateral potencials anastomosis at level of the posterior communicating branches, with fetal pattern or with gross caliber (Padget, 19483), were present in the 71,2% (62/87) of the arterial circles. The bilateral potencials anastomosis were formed by two posterior communicating branches with fetal pattern in the 10,4% (9/87) of the cases, by two of those vessels of gross caliber in the 11,5% (10/87) of the circles, and by one fetal posterior communicating branch, and one contralateral posterior communicating branch of gross caliber in the 13,8% (12/87) of the cases. Unilateral potencials anastomosis constituted by fetal posterior communicating branch (21,8%) or by posterior communicating branch with gross caliber (13,8%) ocurred in the 35,6% (31/87) of the arterial circles.
本神经解剖学研究旨在确定87例无任何明显神经功能障碍临床表现的巴西东北部人群大脑中脑动脉环后部潜在吻合的频率。后交通支的胎儿型在46%（40/87）的病例中存在。关于侧别的频率如下：右侧为21.8%（19/87）；左侧为12.8%（12/87）；双侧为10.4%（9/87）。71.2%（62/87）的动脉环在后交通支水平存在双侧和单侧潜在吻合，其具有胎儿型或粗大管径（帕吉特，19483）。双侧潜在吻合在10.4%（9/87）的病例中由两条具有胎儿型的后交通支形成，在11.5%（10/87）的动脉环中由两条粗大管径的血管形成，在13.8%（12/87）的病例中由一条胎儿型后交通支和一条对侧粗大管径的后交通支形成。由胎儿型后交通支（21.8%）或粗大管径的后交通支（13.8%）构成的单侧潜在吻合出现在35.6%（31/87）的动脉环中。
