Wang Changxue, Jiang Suming, Liu Jinfeng, Liu Jinsheng
Department of Anatomy, Medical College of Shantou University, Shantou 515041, China.
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi. 2008 Aug;22(16):725-8.
To provide anatomic data for cochlear implantation, and to find the method of locating lamina spiralis (LS) on the surface of promontory.
Microanatomical study was carried out on 30 sides of human temporal bones by observing and measuring lamina spiralis below promontory, including its location, course and adjacent structures.
(1) The basal turn of lamina spiralis below promontory can be divided into three segments: the hook segment (1.52 +/- 0.16) mm, the anteroinferior round window segment (3.83 +/- 0.37) mm and the forwarding segment (2.70 +/- 0.36) mm by two hinge points of which one was located at anterior of the junction of superior margin and anterior border of RW, and the other was located at anteroinferior of the round window; (2) The plane of round window anteroinferior segment of LS lay (51.00 +/- 5.97) degrees anteroinferior to horizontal segment of the facial nerve and comparative permanently meet posterior margin of'stapes head. Made posterior margin of stapes head as a fixation point and draw a line on promontory lay (51.00 +/- 45.97) degrees anteroinferior to horizontal segment of the facial nerve. This line can be thought as the projection of anteroinferior round window segment of LS on promontory; (3) The width of scala tympani at cochleostomy site on promontory: width of scala tympani at midpoint of superior margin of round window was (0.36 +/- 0.06) mm; width of scala tympani at midpoint of anterior border of round window was (0.97 +/- 0.14) mm; width of scala tympani at 3 mm point of anteroinferior round window segment was (1.24 +/- 0.21) mm.
(1) The basal turn lamina spiralis below promontory can be divided into three segments (the hook segment, the anteroinferior round window segment and the forwarding segment) by two hinge points; (2) The projection of anteroinferior round window segment of LS and the features exhibited in its course provide reference for locating the basal turn scala tympani and offer reliable anatomical basis for minimal invasive intervention during cochlear implantation.
为人工耳蜗植入提供解剖学数据，探寻在岬表面定位螺旋板（LS）的方法。
对30侧人类颞骨进行显微解剖学研究，观察并测量岬下方的螺旋板，包括其位置、走行及毗邻结构。
（1）岬下方螺旋板的基底部可通过两个铰链点分为三段：钩段（1.52±0.16）mm、前下圆窗段（3.83±0.37）mm和前行段（2.70±0.36）mm，其中一个铰链点位于圆窗上缘与前缘交界处的前方，另一个位于圆窗的前下方；（2）螺旋板圆窗前下段平面位于面神经水平段前下方（51.00±5.97）度，且较恒定地与镫骨头后缘相交。以镫骨头后缘为固定点，在岬上画一条位于面神经水平段前下方（51.00±45.97）度的线。此线可被视为螺旋板圆窗前下段在岬上的投影；（3）岬上蜗窗造瘘部位鼓阶的宽度：圆窗上缘中点处鼓阶宽度为（0.36±0.06）mm；圆窗前缘中点处鼓阶宽度为（0.97±0.14）mm；圆窗前下段3mm处鼓阶宽度为（1.24±0.21）mm。
（1）岬下方的螺旋板基底部可通过两个铰链点分为三段（钩段、前下圆窗段和前行段）；（2）螺旋板圆窗前下段的投影及其走行所表现出的特征为定位鼓阶底部提供了参考，为人工耳蜗植入术中的微创干预提供了可靠的解剖学依据。
