Gasserian Ganglion

• Gasserian ganglion, V1 form lateral limit of infratrochlear triangle.
• Maxillary branch of trigeminal nerve exits GG center, runs to foramen rotundum.
• Mandibular nerve occupies most of GG, enters the foramen ovale.
• Mean length of MC: 6-16mm; GG: 15-25mm long, 4-5mm wide.
• GG is sensory ganglion of trigeminal nerve, crescent shaped.
• Subarachnoid space w/i MC extends ~4.9 mm medially and ~1.7 mm laterally beyond posterior edge of GG.
• GG covers petrous ICA & ascending part of cavernous ICA.
• Malignant tumors with primary involvement of sphenoidal sinus difficult to manage, cavernous sinus or internal carotid resection not advised.
• Trigeminal schwannomas (TSs) arise from GG, grow in interdural space in MC, localized to middle cranial fossa.