Nervous and mental diseases . s not clearly known. The sensory and motor trunks leavethe surface of the pons separately, though side by side, and only afterthe sensory portion has passed through the Gasserian ganglion does themotor trunk join the third trigeminal division. According to Gowers and others, the strictly gustatory portion fol-lows a most extraordinary course before, as the chorda tympani, itreaches the lingual nerve and is distributed to the anterior portion ofthe tongue. At first contained in the sensory root, it apparently passesfrom the Gasserian enlargement with the middle or
Nervous and mental diseases . s not clearly known. The sensory and motor trunks leavethe surface of the pons separately, though side by side, and only afterthe sensory portion has passed through the Gasserian ganglion does themotor trunk join the third trigeminal division. According to Gowers and others, the strictly gustatory portion fol-lows a most extraordinary course before, as the chorda tympani, itreaches the lingual nerve and is distributed to the anterior portion ofthe tongue. At first contained in the sensory root, it apparently passesfrom the Gasserian enlargement with the middle or superior maxillarybranch. Thence it drops into the sphenopalatine or Meckels ganglion,and turns backward in the form of the Vidian nerve, to penetrate thepetrous portion of the temporal bone and join the facial nerve in theFallopian aqueduct. It follows the facial nearly to its exit at the sty-lomastoid foramen, where it turns shaprly upward, reaching the tym-panic cavity, which it leaves by the Gasserian fissure. It then de-. Fig. 40.—Distribution of the sensory cutaneous nerves on the head : V1( V2, V3, The three branchesof the trigeminus ; at, auriculotemporal; so, supraorbital; st, supratrochlear; it, infratrochlear ; /, lac-rymal; m, mental; b, buccinator; am, auricular is magnus: sm, subcutaneous mala?; oma, occipitalismajor; omi, occipitalis minor; cs, superficial cervical (after Hirt). scends between the pterygoid muscles and joins the lingual branch ofthe inferior maxillary or third trifacial division, to be distributed to theanterior portion of die tongue. The base of the tongue and faucialpillars also recognize taste impressions. It is supposed that these sensa-tions reach the trunk of the fifth by way of the glossopharyngeal nervethrough connections with Meckels ganglion. AVe know certainly thatdivision of the sensory root of the fifth abolishes all taste sensation onthe corresponding side of the tongue at least temporarily, but Cushing,1after an elaborate study o
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