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Figure 6: Separation of MCF dura from the lateral dural cavernous wall. (a) Separation of MOB from V1. A distinct plane is seen between MOB and V1 and the medial compartment of SOF. (b) Separation of MCF dura from V1 and V2. Although the plane between V1 and MOB is evident from the ventral perspective, separation can be facilitated by the appreciation of V2 position and its medial retraction. Note that fat of AMT obscures V1. (c) Transmaxillary endoscopic view of V1 and V2. GG appears at the junction of V1 and V2. (d) Separation of V1, V2, and V3 from the MCF dura. The venous plexus around V3 through foramen ovale is evident (arrow). (e) Panoramic endoscopic views of the surgical corridor showing temporalis and lateral pterygoid muscles laterally, cav medially, FT. (d) Superiorly and V3 and Pb inferiorly. (f) Endoscopic zero-degree view of oculomotor and trochlear nerves. (g) Endoscopic transmaxillary view of the oculomotor and trochlear nerves. Note the inner cavernous dural wall is intact. (h) Exposure of MCF bony base and superior petrosal sinus. CR: clival recess, pit: pituitary gland, cav: cavernous sinus. III: oculomotor nerve, IV: trochlear nerve, V1: ophthalmic nerve, V2: maxillary nerve, V3: mandibular nerve, GG: Gasserian ganglion, MCF d: middle cranial fossa dura, MCF b: middle cranial fossa base, SPS: superior petrosal sinus, LPM: lateral pterygoid muscle, TM: temporalis muscle, Pb: pterygoid base, MOB: meningo-orbital band, mSOF: medial compartment of SOF

Figure 6: Separation of MCF dura from the lateral dural cavernous wall. (a) Separation of MOB from V1. A distinct plane is seen between MOB and V1 and the medial compartment of SOF. (b) Separation of MCF dura from V1 and V2. Although the plane between V1 and MOB is evident from the ventral perspective, separation can be facilitated by the appreciation of V2 position and its medial retraction. Note that fat of AMT obscures V1. (c) Transmaxillary endoscopic view of V1 and V2<b>. </b>GG appears at the junction of V1 and V2. (d) Separation of V1, V2, and V3 from the MCF dura. The venous plexus around V3 through foramen ovale is evident (arrow)<b>. </b>(e) Panoramic endoscopic views of the surgical corridor showing temporalis and lateral pterygoid muscles laterally, cav medially, FT. (d) Superiorly and V3 and Pb inferiorly. (f) Endoscopic zero-degree view of oculomotor and trochlear nerves. (g) Endoscopic transmaxillary view of the oculomotor and trochlear nerves. Note the inner cavernous dural wall is intact<b>. </b>(h) Exposure of MCF bony base and superior petrosal sinus. CR: clival recess, pit: pituitary gland, cav: cavernous sinus. III: oculomotor nerve, IV: trochlear nerve, V1: ophthalmic nerve, V2: maxillary nerve, V3: mandibular nerve, GG: Gasserian ganglion, MCF d: middle cranial fossa dura, MCF b: middle cranial fossa base, SPS: superior petrosal sinus, LPM: lateral pterygoid muscle, TM: temporalis muscle, Pb: pterygoid base, MOB: meningo-orbital band, mSOF: medial compartment of SOF