title: [Observation of cranial nerves in the cerebellopontine angle region by retrosigmoid approach].
abstract: OBJECTIVE
  To investigate the anatomical structures of cranial nerves in the cerebellopontine angle region to offer anatomical data for clinical operation.
  
  
  METHODS
  A total of 52 adult cadaveric heads fixed in 10% formalin were used for this study. After cutting cerebellum and meningeal between transverse and sigmoid sinus, simulate operating method of retrosigmoid approach to observe the cranial nerves.
  
  
  RESULTS
  External diameter and length of left V, VII, VIII, IX cranial nerves are (2.54 +/- 0.84) mm and (6.79 +/- 2.51) mm, (1.18 +/- 0.31) mm and (9.89 +/- 2.66) mm, (2.17 +/- 0.52) mm and (9.92 +/- 2.61) mm, (0.77 +/- 0.24) mm and (10.34 +/- 3.12) mm respectively. External diameter and length of right V , VII, VIII, IX cranial nerves are (2.52 +/- 0.86) mm and (6.91 +/- 2.66) mm, (1.14 +/- 0.31) mm and (10 +/- 2.96) mm, (2.13 +/- 0.63) m and (10.09 +/- 2.93) mm, (0.790.29) mm and (10.17 +/- 3.06) mm. intermedius nerve locate between facial nerve and acoustic nerve, external diameter of intermedius nerve is (0.47 +/- 0.91) mm (left) and (0.37 +/- 0.07) mm (right). Length of vagal nerve is (10.44 +/- 2.57) mm (left), (9.91 +/- 2.91) mm (right), rootlets of f vagal nerve is 6.37 +/- 2.26 (left) and 6.33 +/- 2.38 (right). external diameter of accessory nerve is (0.76 +/- 0.16) mm (left) and (0.81 +/- 0.19) mm (right).
  
  
  CONCLUSIONS
  This study provide anatomical data for retrosigmoid approach in the cerebellopontine angle region.
authors: Department of Otorhinolaryngology, Pudong Gongli Hospital, Shanghai, 200136, China. xwh1214@126.com
authors: Weihua
authors: W
authors: Xu
authors: Guangbin
authors: G
authors: Sun
authors: Xiaoping
authors: X
authors: Chen
authors: Qun
authors: Q
authors: Chen
authors: Qin
authors: Q
authors: Fang
authors: Na
authors: N
authors: Sun
authors: Yi
authors: Y
authors: Zhang
authors: Jingfei
authors: J
authors: Zhang
authors: Mingzhong
authors: M
authors: Ren
mesh_terms: D000328:Adult; D002530:Cerebellopontine Angle / Q000033:anatomy & histology*; D003391:Cranial Nerves / Q000033:anatomy & histology*; D003392:Cranial Sinuses / Q000033:anatomy & histology / Q000601:surgery; D005154:Facial Nerve / Q000033:anatomy & histology*; D005930:Glossopharyngeal Nerve / Q000033:anatomy & histology; D006801:Humans; D000159:Vestibulocochlear Nerve / Q000033:anatomy & histology