Neurol India Close
 

Figure 1: (a) Dry skull model demonstrating different measurements of the superior orbital fissure, a: superolateral edge, b: superomedial edge, c: inferior edge, ab = length from the superolateral to superomedial angle, ac = length from the superlateral angle to inf angle, d: point of bony attachment of the annular tendon divides the SOF into medial and lateral parts, ad; length lat to annulus of Zinn, h: midpoint between b and c on the line of longitudinal axis of the SOF, g angle: angle between the longitudinal axis of SOF and the midline (toward the superior border of the SOF), d angle: angle between the medial and lateral parts of the SOF (toward the lower border of the SOF), fe: horizontal length between superolateral and superomedial edges of the SOF. (b) 3D reconstruction of the skull demonstrating the distance between different points of the SOF and the midline. (c) CT scan coronal cut at the level of the orbital apex, demonstrating the left superior orbital fissure (delineated by red color) and the left optic canal (delineated by blue color). a: superolateral edge, b: superomedial edge, c: inferior edge of the right superior orbital fissure. Green lines demonstrate the distance from these points and the midline. (d) CT scan showing superomedial trajectory (in blue; from the superomedial point of the OC to the MS) of the orbital apex and superior orbital fissure that can be approached endonasally, and superolateral trajectory (in red; from LWS to MS) that can be approached in this study (endonasal transmaxillary). OC; optic canal, LWS; lesser sphenoidal wing, SOF; superior orbital fissure, GWS; greater sphenoidal wing, MS; maxillary strut, FR; foramen rotundum

Figure 1: (a) Dry skull model demonstrating different measurements of the superior orbital fissure, a: superolateral edge, b: superomedial edge, c: inferior edge, ab = length from the superolateral to superomedial angle, ac = length from the superlateral angle to inf angle, d: point of bony attachment of the annular tendon divides the SOF into medial and lateral parts, ad; length lat to annulus of Zinn, h: midpoint between b and c on the line of longitudinal axis of the SOF, g angle: angle between the longitudinal axis of SOF and the midline (toward the superior border of the SOF), d angle: angle between the medial and lateral parts of the SOF (toward the lower border of the SOF), fe: horizontal length between superolateral and superomedial edges of the SOF. (b) 3D reconstruction of the skull demonstrating the distance between different points of the SOF and the midline. (c) CT scan coronal cut at the level of the orbital apex, demonstrating the left superior orbital fissure (delineated by red color) and the left optic canal (delineated by blue color). a: superolateral edge, b: superomedial edge, c: inferior edge of the right superior orbital fissure. Green lines demonstrate the distance from these points and the midline. (d) CT scan showing superomedial trajectory (in blue; from the superomedial point of the OC to the MS) of the orbital apex and superior orbital fissure that can be approached endonasally, and superolateral trajectory (in red; from LWS to MS) that can be approached in this study (endonasal transmaxillary). OC; optic canal, LWS; lesser sphenoidal wing, SOF; superior orbital fissure, GWS; greater sphenoidal wing, MS; maxillary strut, FR; foramen rotundum