Study of Middle Cranial Fossa Group and Paraclival Group of Parasellar Triangles

Introduction: middle group of triangles and paraclival group is particularly significant due to its role in providing access to deep-seated structures such as the internal carotid artery, the cavernous sinus, clival structures, brain stem and cranial nerves. The objectives of this study was to delineate the borders of parasellar middle group and paraclival group triangles and to morphometrically evaluate of these triangles. Methodology: in a cross-sectional observational study design, conducted in Department of Anatomy from May 2021 to August 2022, borders, morphometry and contents of middle group of triangles (anteromedial, anterolateral, posteromedial and posterolateral triangles) and paraclival group (inferomedial and inferolateral triangles) were studied in 65 cranial fossa specimens. Results: The medial border of anteromedial triangle formed by ophthalmic nerve was the longest with average measurement of 13.05 mm (± 1.49 mm). The lateral border of anterolateral triangle formed by mandibular nerve was the shortest with average length of 6.01 mm (± 1.4 mm) and medial border formed by maxillary nerve was the longest with average measurement of 11.55 mm (± 2.15 mm). The medial border of posteromedial triangle formed by GSPN was the longest with average measurement of 16.8 mm (± 2.56 mm). The base of posterolateral triangle formed by GSPN was the longest with average measurement of 17.13 mm (± 3.16 mm). The lateral border of inferolateral triangle was the shortest with average length of 9.85 mm (± 1.44 mm) and base was the longest with average measurement of 14.84 mm (± 1.83 mm) Conclusion: morphometric measurements of middle group of triangles and paraclival group triangles, namely, anteromedial, anterolateral, posteromedial, posterolateral, inferomedial and inferolateral triangles are presented. This normative value acts as guidance for surgeons for planning the surgeries in the middle cranial fossa, approaches to cavernous sinus, paraclival regions