title: [Clinical research about the distribution of perineural vascular plexus of the facial nerve].
abstract: OBJECTIVE
  To objectively evaluate the usefulness and the reliability of the perineural vascular plexus as a landmark for facial nerve as well as whether it will be a landmark for identification of the facial nerve in surgery for otology and neurotology by means of investigating the location of the facial nerve for prevention of iatrogenic facial palsy.
  
  
  METHODS
  Prospective case series were designed. Three hundred and eleven consecutive patients were studied which required tympanoplasty for chronic otitis media or microsurgery for facial nerve decompression and congenitally malformation of the ear from July 2002 to July 2005. All the patients were operated by the first author. Perineural vascular plexus as a landmark for identification of the facial nerve in surgery were observed to assess the utility.
  
  
  RESULTS
  The well recognized perineural vascular plexus were seen on the horizontal mesotympanic segment of the nerve in 95.8% of patients (298 cases), and only in 4.2% of the patients (13 cases), the vessel plexus was difficult to identify. The 95% confidence interval was from 93.6% to 98.0%.
  
  
  CONCLUSIONS
  The vascular plexuses around or over the horizontal portion of the facial nerve provide an early and direct indicator of the location of the facial nerve. The perineural vascular plexus could be a dependable and reliable landmark for the identification the horizontal part of the facial nerve in surgery for otology and neurotology.
authors.affiliation: Department of Otology and Skull Base Surgery, Eye Ear Nose & Throat Hospital of Fudan University, Shanghai 200031, China. bchen@citiz.net
authors.forename: Bing
authors.initials: B
authors.lastname: Chen
authors.forename: Wen-jia
authors.initials: WJ
authors.lastname: Dai
authors.forename: Fang-lu
authors.initials: FL
authors.lastname: Chi
authors.forename: Hua-wei
authors.initials: HW
authors.lastname: Li
authors.forename: Zheng-min
authors.initials: ZM
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D005154:Facial Nerve / Q000098:blood supply* / Q000601:surgery; D005158:Facial Paralysis / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008866:Microsurgery; D008875:Middle Aged; D019635:Neurosurgical Procedures; D010033:Otitis Media / Q000601:surgery; D011446:Prospective Studies; D014650:Vasa Nervorum / Q000033:anatomy & histology*; D055815:Young Adult