1999 年 75 巻 6 号 p. 319-322
An anatomical study was performed in order to obtain help for orientation regarding the cranial base approaches to the anterior cranial base. Cranial base approaches were studied in 8 adult cadaver heads, and morphometric measurements critical in these approaches were achieved in 76 dry skulls. Importance of the surgical anatomy of the opticochiasmatic apparatus, optic canal, sphenoid ridge, and anterior clinoid was emphasised in this study. Observations from the dissections and operative approaches, and measurements between various points were recorded in a specifically designed software, and these data helped both to understand the local anatomy and the relationship to the intimate structures better and to decide the head position, the degree and direction of safe bony removal, and the direction of the operative approach during the surgery. Considerations important in the selection of these structures, anatomical landmarks and distances were discussed.
