[Observation of cranial nerves in the cerebellopontine angle region by retrosigmoid approach].
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.
Xu
Weihua
W
Department of Otorhinolaryngology, Pudong Gongli Hospital, Shanghai, 200136, China. xwh1214@126.com
Sun
Guangbin
G
Chen
Xiaoping
X
Chen
Qun
Q
Fang
Qin
Q
Sun
Na
N
Zhang
Yi
Y
Zhang
Jingfei
J
Ren
Mingzhong
M
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