. Cunningham's Text-book of anatomy. Anatomy. 772 THE NERVOUS SYSTEM. The large sensory root gradually conceals the small motor root in its course forwards, and expands beneath the dura mater into a large flattened ganglion— the semilunar ganglion. This ganglion occupies an impression on the apex of the petrous portion of the temporal bone, and from it three large trunks arise—the ophthalmic or first, the maxillary or second, and the mandibular or third divisions of the nerve. The small motor root of the nerve passes forward beneath the ganglion, and is incorporated wholly with the mandibular
. Cunningham's Text-book of anatomy. Anatomy. 772 THE NERVOUS SYSTEM. The large sensory root gradually conceals the small motor root in its course forwards, and expands beneath the dura mater into a large flattened ganglion— the semilunar ganglion. This ganglion occupies an impression on the apex of the petrous portion of the temporal bone, and from it three large trunks arise—the ophthalmic or first, the maxillary or second, and the mandibular or third divisions of the nerve. The small motor root of the nerve passes forward beneath the ganglion, and is incorporated wholly with the mandibular division of the nerve. Nervus Ophthalmicus. The ophthalmic nerve passes forwards to the orbit through the middle fossa of the skull, beneath the dura mater. It lies in the lateral wall of the cavernous sinus, at a lower level than the trochlear nerve, and reaches the orbit through the superior orbital fissure (Fig. 645). In the wall of the cavernous sinus the ophthalmic nerve gives off (1) a small recurrent branch to the dura mater (n. tentorii), (2) communicating branches to the cavernous plexus of the sym- pathetic on the internal carotid artery, and (3) small communi- cating twigs to the trunks of the oculo-motor, trochlear, and abducent nerves. In the superior orbital fissure the nerve divides into three main branches—lacrimal, frontal, and naso-ciliary (Fig. 645). N. Lacrimalis. — The lacrimal nerve enters the orbit through the lateral angle of the superior orbital fissure, above the orbital muscles. Passing forwards between the periosteum and the orbital contents to the anterior part of the orbit, the nerve ends by supplying branches (a) to the lacrimal gland, (b) to the con- junctiva,and (e) to the skin of the lateral commissure of the Fig. 648. -Distribution of Sensory Nerves to the Head and Neck. The lacrimal nerve communicates in the orbit with the zygomatic branch of the maxillary nerve, and on the face, by its terminal branches, with the temporal branc
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