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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.

CliniCal asPeCts oF aGe-related sPHenoid Bone struCture VariaBilitY in CHildren a b s t r a C t -Aim of our study was to identify the morphometric variability of the parameters pertaining to the sphenoid bone body structures in children of different ages, in order to improve access to the skull internal base as well as to the adjacent structures during endoscopic interventions. The craniometry method was used to study 87 child skulls, age 1-21, without regard to gender (65 skulls from the fundamental Museum of the Department of Anatomy, the Saratov State Medical University, and 22 skulls from the Department of Normal Anatomy, Military Medical Academy (Saint Petersburg), broken into 6 age periods. The length of the sphenoidal yoke, as well as its width along with the front and back edges, and the length and width of the prechiasmatic sulcus, tuberculum sellae, its width and height, and the length and width of the sella turcica were identified.The results of the study has revealed that most of the examined structures feature stable values until the age of 7 years (linear parameters of the sphenoidal yoke, the width of the prechiasmatic sulcus, the length and width of the saddle tubercle); these anatomical formations show intensive growth only at the age of 8-12. The height of the tuberculum sellae changes at the age of 4-7, reaching the final value; the length of the prechiasmatic sulcus grows at the ages of 4-7 and 13-16 and does not change in adolescence. The width of the Turkish saddle increases at the ages of 4-7 and 13-16; its length features the same values by the age of 12, increasing only within the period of 13-16, reaching stable values in adolescence. K E y w o r d s -sphenoidal yoke, prechiasmatic sulcus, tuberculum sellae, sella turcica, endoscopic interventions.

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