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Information about the typical stereotopic variability of the sphenoidal yoke of the sphenoid bone is necessary to expand the scientific and technical capabilities in neurosurgery. The aim of the study was to study the stereotopic variability of the sphenoidal yoke of the sphenoid bone in adults, depending on the type of base of the skull. By stereotopometry on 100 passported turtles of people of mature age (21-60 years old) from the collection of the Fundamental Museum of the Department of Human Anatomy Razumovsky Saratov State Medical University, the value of the basilar angle is determined and the types of its base are highlighted; we studied the spatial coordinates of standard craniometric points (nasion, sellar, basion) and non-standard craniometric points: the front and rear edges of the sphenoidal yoke on the right and left, according to the distance of their projections to three mutually perpendicular planes: sagittal, frontal and Frankfurt. The typical variability of the spatial position of the sphenoidal yoke was established: in flexibasilar types of the skull – yoke occupies a higher spatial position relative to the Frankfurt plane, close to the front and both its edges are equally distant from the sagittal plane, compared with the level of platibasilar type. The height of the sphenoidal yoke of the mediobasilar type relative to the Frankfurt plane corresponds to the level of flexibasilar, relative to the frontal plane - it occupies a middle position between the parameters of the extreme types of the base of the skull, relative to the sagittal plane - its front edge occupies the same position as the extreme types, while the location of its posterior edge corresponds to the level of the plate-basilar type.

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