Department of ENT, Christian Medical College, Vellore, India.
J Laryngol Otol. 2023 Jul;137(7):769-774. doi: 10.1017/S0022215123000026. Epub 2023 Jan 23.
This study aimed to determine anatomical landmarks for accurate and safe middle turn cochleostomy on cadaveric temporal bones.
In 17 cadaveric wet adult temporal bones, cortical mastoidectomy was performed, followed by extended posterior tympanotomy through which a middle turn opening was created anterior to the stapes footplate. Micro-measurements of various lengths were taken from the cochleostomy to normal middle-ear anatomical landmarks using a digital microscope.
The mean length from the middle turn cochleostomy to the processus cochleariformis was 1.8 ± 0.3 mm and to the tympanic segment of the facial nerve was 2.2 ± 0.3 mm. The mean shortest length from the oval window to the osseous spiral lamina was 2.4 ± 0.3 mm and to the internal carotid artery was 5.0 ± 0.6 mm. The mean shortest length from the round window to the internal carotid artery was 4.3 ± 0.6 mm.
A middle turn cochleostomy can be safely drilled by using the measured lengths in difficult cases.
本研究旨在确定尸体颞骨上准确、安全的中回耳蜗切开术的解剖学标志。
在 17 具湿性成人尸体颞骨中，行皮质乳突切除术，然后通过扩大的后鼓室切开术在前镫骨脚板前方创建中回开口。使用数字显微镜从耳蜗切开术到正常中耳解剖标志测量各种长度的微测量值。
从中回耳蜗切开术到耳蜗形突的平均长度为 1.8 ± 0.3mm，到面神经鼓室段的平均长度为 2.2 ± 0.3mm。从卵圆窗到骨螺旋板的最短平均长度为 2.4 ± 0.3mm，到颈内动脉的最短平均长度为 5.0 ± 0.6mm。从圆窗到颈内动脉的最短平均长度为 4.3 ± 0.6mm。
在困难情况下，可以使用测量的长度安全地进行中回耳蜗切开术。
