Karatas Ayse, Yilmaz Hakan, Coban Gokmen, Koker Murat, Uz Aysun
Izmir Katip Celebi University, Ataturk Education and Research Hospital, Department of Neurosurgery, Izmir, Turkey.
Turk Neurosurg. 2016;26(1):54-61. doi: 10.5137/1019-5149.JTN.13281-14.1.
The function of the circle of Willis, an arterial polygon, is to protect the brain from ischemia. The aim of this study is to define the structural characteristics of the circle of Willis within the Turkish adult population, along with variations and arteries involved in the measurement of diameters and lengths on cadavers.
The circle of Willis was evaluated in 100 fresh adult cadavers. Structures of the circle of Willis were evaluated as being typical or atypical images and according to the diameter of AComP. All arteries forming the circle's length and diameters were measured.
All arteries forming the circle of Willis as 91% were anatomically observed. The typical structure in which hypoplasia arteries is not involved was obtained as 8%. The atypical circle of Willis with aplasia was seen as 9%. 87% of adult, 9% fetal, and 4% transitional configuration in the samples were detected. The variations of the circle of Willis were more common in the posterior portion. Hypoplasia was found to be the most common variation and noted as a maximum in AComP (85%). Aplasia was noted as the second most common variation after hypoplasia and again the most common in AComP (5%).
Advances in radiological methods which provide images of cerebral vessels and the development of cerebrovascular surgery have increased the importance of the circle of Willis in neurosurgery and neurology. The structure of the circle of Willis is of great importance in occlusive cerebrovascular diseases and cerebrovascular surgery.
Willis环作为一个动脉多边形，其功能是保护大脑免受缺血影响。本研究的目的是确定土耳其成年人群中Willis环的结构特征，以及尸体上直径和长度测量所涉及的变异和动脉。
对100具新鲜成人尸体的Willis环进行评估。Willis环的结构根据前交通动脉（AComP）的直径评估为典型或非典型图像。测量构成环的长度和直径的所有动脉。
解剖观察到构成Willis环的所有动脉占91%。未涉及发育不全动脉的典型结构占8%。观察到发育不全的非典型Willis环占9%。样本中87%为成人型、9%为胎儿型、4%为过渡型。Willis环的变异在后部更为常见。发育不全是最常见的变异，在前交通动脉中最为明显（85%）。发育不全是继发育不全之后第二常见的变异，在前交通动脉中同样最为常见（5%）。
提供脑血管图像的放射学方法的进步以及脑血管外科的发展增加了Willis环在神经外科和神经病学中的重要性。Willis环的结构在闭塞性脑血管疾病和脑血管外科中具有重要意义。
