title: [Microanatomy study on sinus triangle region].
abstract: OBJECTIVE
  To explore shape and position relationship of the structures with in sinus triangle region, and provide the anatomic foundation for extended presigmoid operative approach.
  
  
  METHODS
  Ten cadaveric heads and 15 skull-base specimens fixed with 10% formalin, with aid of operative microscope, the shape and relations of structures with in the sinus triangle region were observed and microphotographed. Four cadaveric heads were sectioned in different plane using collodion embedding process.
  
  
  RESULTS
  Jugular blub (JB) had high -placed jugular blub (HJB), normal jugular blub (NJB) and low-placed jugular blub (LJB). The incidence of HJB was 8% and 18% for the left and right sides (P < 0.01). The JB dome can extend upward the hypotympanic cavity and the posterior wall of the internal acoustic meatus. The incidence of NJB and LJB was 36% and 30%, and 6% and 2% respectively. The level distance between the posterior semicircular canal and petrosal posterior surface was (4.1 +/- 1.1) mm. The distance between the JB and vertical part of the facial nerve was (3.2 +/- 0.5) mm and (2.0 +/- 0.4) mm. The distance between the JB and posterior margin of the internal acoustic port was (7.5 +/- 1.7) mm and (4.0 +/- 1.0) mm.
  
  
  CONCLUSIONS
  Knowing the shape and position relationship of structures in the sinus triangle region is favorable for preserving the important structures in extended presigmoid operative approach.
authors.affiliation: Center of Orthopedics Trauma, Ji'nan General Hospital, People's Liberation Army, Ji'nan 250031, China.
authors.forename: Zihai
authors.initials: Z
authors.lastname: Ding
authors.forename: Chunjiang
authors.initials: C
authors.lastname: Yu
authors.forename: Derun
authors.initials: D
authors.lastname: Tian
authors.forename: Yunsheng
authors.initials: Y
authors.lastname: Li
authors.forename: Chunshui
authors.initials: C
authors.lastname: Yu
mesh_terms: D001344:Autopsy; D002102:Cadaver; D003392:Cranial Sinuses / Q000033:anatomy & histology*; D005924:Glomus Jugulare / Q000033:anatomy & histology*; D006801:Humans; D009445:Neuroanatomy; D012665:Semicircular Canals / Q000033:anatomy & histology*