Wysiadecki Grzegorz, Radek Maciej, Tubbs R Shane, Iwanaga Joe, Walocha Jerzy, Brzeziński Piotr, Polguj Michał
Department of Normal and Clinical Anatomy, Chair of Anatomy and Histology, Medical University of Lodz, 90-752 Łódź, Poland.
Department of Neurosurgery, Spine and Peripheral Nerve Surgery, Medical University of Lodz, University Hospital WAM-CSW, 90-549 Łódź, Poland.
Brain Sci. 2021 May 4;11(5):596. doi: 10.3390/brainsci11050596.
The inferomedial triangle is one of the two surgical triangles in the paraclival subregion of the skull base. It is delineated by the posterior clinoid process, the dural entrance of the trochlear nerve and the dural entrance of the abducens nerve. The aim of the present article is to describe the anatomical variations within the inferomedial triangle. Measurements of the triangle's borders and area were supplemented by detailed observations of the topographical anatomy and various arrangements of its contents. Nine adult cadaveric heads (18 sides) and 28 sagittal head sections were studied. The mean area of the inferomedial triangle was estimated to be 60.7 mm. The mean lengths of its medial, lateral and superior borders were 16.1 mm, 11.9 mm and 10.4 mm, respectively. The dorsal meningeal artery was identified within the inferomedial triangle in 37 out of 46 sides (80.4%). A well-developed petrosphenoidal ligament of Grüber was identified within the triangle on 36 sides (78.3%). Although some structures were variable, the constant contents of the inferomedial triangle were the posterior petroclinoid dural fold, the upper end of the petroclival suture, the gulfar segment of the abducens nerve and the posterior genu of the intracavernous internal carotid artery.
下内侧三角是颅底斜坡旁区域的两个手术三角之一。它由后床突、滑车神经的硬膜入口和展神经的硬膜入口所界定。本文的目的是描述下内侧三角内的解剖变异。通过对该三角边界和面积的测量，并辅以对其局部解剖结构及其内容物各种排列的详细观察。研究了9个成人尸体头部（18侧）和28个矢状头断面。下内侧三角的平均面积估计为60.7平方毫米。其内侧、外侧和上边界的平均长度分别为16.1毫米、11.9毫米和10.4毫米。46侧中有37侧（80.4%）在下内侧三角内发现了脑膜后动脉。36侧（78.3%）在三角内发现了发育良好的格鲁伯岩蝶韧带。尽管一些结构存在变异，但下内侧三角恒定的内容物是岩床后硬膜皱襞、岩斜缝上端、展神经的海绵窦段和海绵窦内颈内动脉的后膝部。
