The patient had sensory numbness in the right zygomatic arch and face, therefore, it was V2 invasion, and the site of tumor invasion could be roughly determined according to its nerve course. The following is the distribution of the trigeminal nerve. The patient also had right abducens nerve invasion, and there should be cavernous sinus or supraorbital fissure invasion, which was confirmed by MRI. The tumor invades along the pterygopalatine fossa, the inferior orbital fissure, and then the cavernous sinus The trigeminal nerve (Trigeminal nerve) is a mixed nerve, which means that it contains both motor and sensory nerves. The sensory part collects information from the face and head, while the motor part controls the masticatory muscles. The trigeminal nerve is the thickest nerve in the face, and its motor part exits the brain at the junction of the pons and pons arm, merges into the mandibular nerve, and passes out of the skull together through the foramen ovale. The sensory part of the nerve is composed of a trigeminal ganglion located at the tip of the temporal bone, which in turn divides into three branches (that is why it is called the trigeminal nerve), the first branch is the ophthalmic branch, the second is the maxillary branch, and the third is the mandibular branch. branch). The first branch is the ophthalmic branch, the second is the maxillary branch, and the third is the mandibular branch. The ophthalmic nerve is the smallest of the three branches, separating from the maxillary and mandibular nerves at the trigeminal ganglion and then penetrating the lateral wall of the cavernous sinus and entering the orbit through the superior orbital fissure below the motoneurone and the talocrural nerves. The ophthalmic nerve has three more branches: the lacrimal nerve, the frontal nerve, and the nasociliary nerve. The second branch of the maxillary nerve The maxillary nerve is a sensory nerve The maxillary nerve also enters the lateral aspect of the hippocampal sinus after departing from the trigeminal ganglion, exits the skull at the foramen rotundum and enters the pterygopalatine fossa, and enters the infraorbital region through the infraorbital fissure, becoming the infraorbital nerve. Its main branches are the infraorbital nerve, the gyrus nerve, the pterygopalatine nerve, and the superior alveolar nerves. The third branch, the mandibular nerve, is a mixed nerve with sensory and motor functions The mandibular nerve is the thickest of the three branches, and it also includes the motor branch of the trigeminal nerve. After leaving the trigeminal ganglion and exiting the skull through the foramen ovale, it divides into two main trunks, anterior and posterior, on the deep surface of the extrapontine muscles. In addition to the motor branch of the trigeminal nerve, it includes the auriculotemporal nerve, buccal nerve, lingual nerve, and inferior alveolar nerve. The abducent nerve, also known as the abducent nerve, is the sixth of twelve pairs of cerebral nerves, numbered VI. It innervates the external rectus muscle, which allows the eye to be aimed outward. It is a purely motor nerve. It travels to the cavernous sinus and the supraorbital fissure out of the skull.