GEOMETRICAL ANALYSIS OF INTRACRANIAL ARTERIES COURSES IN COORDINATE SYSTEM IN THE AIM OF ANATOMICAL NOMENCLATURE OF ARTERIAL WALLS USING 3 DIMENSIONAL AXIS PLANE METHOD

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Background. Anatomic names of the intracranial arterial walls have been widely used in mainly microneurosurgical operations and cadeveric studies principally to provide spatial orientation. In literature, on the basis of which criterias are considered to define the surface anatomy of blood vessels never been described before. Aim. The objective of the current study was to effectuate and clarify a method to determine the anatomic surfaces of the intracranial arteries. Material and Methods. An axial feature of a blood vessel named luminal axis is defined and placed in coordinate system schematically. The angles between the luminal axis of a blood vessel and three anatomical axes are measured in MR Angiographic images in which anatomical coordinate system situated. According to the angulation between the luminal axis and anatomical axes, anatomical surfaces of intracranial arteries are defined and named. Results and Discussion. Angulation of the luminal axis of an arter with sagittal axis smaller than the other anatomical axes has medial, lateral, superior, inferior walls; angulation of the luminal axis of an arter with vertical axis smaller than the other anatomical axes has medial, lateral, anterior, posterior walls; angulation of the luminal axis of an arter with transverse axis smaller than the other anatomical axes has anterior, posterior, superior, inferior walls. Conclusions. «3 Dimensional Anatomical Axis-Plane method» based on numerical dates’ obtained from geometrical measurements in coordinate system is a reliable and scientific method for determining and anatomical nomenclature of the arterial surfaces.