Abstract：
The arcuate eminence (AE) is an anatomically consistent bony protrusion located on the upper surface of the petrous bone that has been previously studied as a reference for lateral skull base approaches. There is a paucity of information in the neurosurgical literature seeking to improve the safety of the extended middle cranial fossa (MCF) approach using detailed morphometric analysis of the AE.
To evaluate the use of the AE as an anatomical landmark to help with early identification of the internal acoustic canal (IAC) in MCF approaches by means of a cadaveric study, using a new morphometric reference termed the \"M-point.\"
A total of 40 dry temporal bones and 2 formalin-preserved, latex-injected cadaveric heads were used. The M-point was established as a new anatomic reference by identifying the intersection of a line perpendicular to the alignment of the petrous ridge (PR), originating from the midpoint of the AE, with the PR itself. Subsequent anatomical measurements were performed to measure the distance between M-point and IAC. Additional distances, including PR length and the anteroposterior and lateral AE surfaces, were also measured.
The mean distance between the M-point and the center of the IAC was 14.9 mm (SD ± 2.09), offering a safe drilling area during an MCF approach.
This study provides novel information on identification of a new anatomic reference point known as the M-point that that can be used to improve early surgical identification of the IAC.
To evaluate the use of the AE as an anatomical landmark to help with early identification of the internal acoustic canal (IAC) in MCF approaches by means of a cadaveric study, using a new morphometric reference termed the \"M-point.\"
A total of 40 dry temporal bones and 2 formalin-preserved, latex-injected cadaveric heads were used. The M-point was established as a new anatomic reference by identifying the intersection of a line perpendicular to the alignment of the petrous ridge (PR), originating from the midpoint of the AE, with the PR itself. Subsequent anatomical measurements were performed to measure the distance between M-point and IAC. Additional distances, including PR length and the anteroposterior and lateral AE surfaces, were also measured.
The mean distance between the M-point and the center of the IAC was 14.9 mm (SD ± 2.09), offering a safe drilling area during an MCF approach.
This study provides novel information on identification of a new anatomic reference point known as the M-point that that can be used to improve early surgical identification of the IAC.
摘要：
背景：弓形隆起（AE）是位于岩骨上表面的解剖学上一致的骨突起，先前已作为颅底外侧入路的参考进行了研究。神经外科文献中缺乏信息，试图使用AE的详细形态计量学分析来提高扩展中颅窝入路的安全性。
目的：通过尸体研究，评估AE作为解剖学标志的使用，以帮助早期识别中颅窝入路的内声管（IAC），使用称为“M点”的新形态测量参考。
方法：共有40个颞骨干燥和2个福尔马林保存，使用乳胶注射的尸体头。通过识别垂直于岩脊排列的线的交点，将M点建立为新的解剖参考。源自AE的中点，岩脊本身。随后进行解剖测量以测量M点和IAC之间的距离。额外的距离,包括岩脊长度以及前后和外侧AE表面，也被测量了。
结果：M点与内部声管中心之间的平均距离为14.9mm（SD±2.09），在扩展的中颅窝入路期间提供安全的钻孔区域。
结论：这项研究提供了一种新的解剖参考点M点的鉴定新信息，该参考点可用于改善IAC的早期手术鉴定。
目的：通过尸体研究，评估AE作为解剖学标志的使用，以帮助早期识别中颅窝入路的内声管（IAC），使用称为“M点”的新形态测量参考。
方法：共有40个颞骨干燥和2个福尔马林保存，使用乳胶注射的尸体头。通过识别垂直于岩脊排列的线的交点，将M点建立为新的解剖参考。源自AE的中点，岩脊本身。随后进行解剖测量以测量M点和IAC之间的距离。额外的距离,包括岩脊长度以及前后和外侧AE表面，也被测量了。
结果：M点与内部声管中心之间的平均距离为14.9mm（SD±2.09），在扩展的中颅窝入路期间提供安全的钻孔区域。
结论：这项研究提供了一种新的解剖参考点M点的鉴定新信息，该参考点可用于改善IAC的早期手术鉴定。
