the asterion wasn " t always located over the superficial surface of the transverse-sigmoid sinus junction 星點并不總是正對橫竇乙狀竇交匯處。
the point of occipital insert of the musculus splenius capitus posterior to the mastoid was located inferior and medial to the transverse-sigmoid sinus junction 乳突后頭夾肌枕骨附著處位于橫竇乙狀竇交匯處的下內(nèi)方。
an anterior sigmoid sinus tend to be observed when the distance between petrous back wall and external auditory canal is shorter . 5.11 / 40 ( 27.5 % ) posterior lip of internal acoustic meatus cover facial nerve more than 1 / 3 氣化的乳突其顳骨巖部后骨板與外耳道后壁之間距離較大,外耳道后壁和顳骨巖部后硬腦膜之間距離也反映了乙狀竇前移程度,該距離愈小,乙狀竇愈有前移傾向。
super-posterior semicircular canal resection s scope is wider than posterior semicircular canal resection and could treat internal acoustic meats lesions too . conclusion : we get the scope of the two different incisions of duramater . study the effect of the sigmoid sinus, jugular bulb and cerebellopontine angle area to retrolabyrinthine approach surgery 后、上半規(guī)管切除在外半規(guī)管以下所得范圍同后半規(guī)管切除相似,在外半規(guī)管平面以上可以有一較大的暴露范圍,可以一直暴露到內(nèi)聽道口,甚至可以暴露內(nèi)聽道的全程,因此可以在直視下處理內(nèi)聽道內(nèi)的病變。