内耳的解剖和MR表现一、解剖骨迷路前庭（vestibule)：位于骨迷路中部的空腔，内藏膜迷路的椭圆囊和球囊；上壁：面神经迷路段跨越；下壁：骨壁；内壁：内耳道底的一部分；外壁：鼓室的内壁。骨半规管（bonysemicircularcanals):为三个C形的互成直角排列的小管外骨半规管（水平）；上骨半规管（上垂直）；后骨半规管（后垂直）；耳蜗膜迷路1、椭圆囊和球囊2、膜半规管(membranoussemicircularcanal)3、蜗管(cochlearduct)二、MRI表现人工电子耳蜗植入术前MRI检查MRI的T2WI对脑脊液和神经纤维有良好的对比性，可以清晰的显示这些神经结构，是术前人工耳蜗植入的重要参考指标。此外，MRI可以显示内耳膜迷路，对排除耳蜗骨化以及迷路炎有重要意义，是保证人工电子耳蜗顺利植入的必备条件之一。3DFSET2WI内耳道脑脊液为高信号，脑脊液中间可见神经呈线状低信号。内淋巴囊扩大FigureA:Theanatomyofthenormalrightinnerear,viewedfromaboveandbehindthetemporalbone.Theendolymphaticduct(arrow)coursesthroughtheproximalbonyvestibulaaqueductfromitsinternalapertureintheanteromedialwallofthevestibuletotheendolymphaticsac(S)foundinthebonyaqueductandwithinashallowimpressionontheposteriorfaceofthepetroustemporalbone.FigureB:DrawingfromthesamevantagepointasinAdepictsanenlargedrightendolymphaticductandsac.Theendolymphaticduct(arrow)andthebonychannelthroughwhichitcourses(vestibularaqueduct)areenlarged.Theendolymphaticsac(S),whichlieswithinthedistalaqueductandbetweentheleavesoftheduraalongtheposterioraspectofthepetrouspyramid,isalsoenlarged.谢谢！