390 SPECIAL ANATOMY. 



on this account the memb. tympani cannot be directly 

 moved at the instigation of the will. Usually : 



2. Two filaments to n. auricula temporalis. 



3. One filament to the chorda tympani (Krause), and one 

 likewise to m. circumflexus palati mollis (Cruveilhier). 



[The translator takes the liberty of adding, in this place, a para- 

 graph from M. Longet's work (Anat. et Phys. du Systeme Nerveux, 

 par F. A. Longet, 2 vols., Paris, 1842), vol. ii. p. 501 : " As for 

 the ganglia which constitute the cephalic portion of the great sym- 

 pathetic, I have myself often insisted upon the double connexion of 

 each of them with a motor and sensitive cerebral nerve ; and I 

 have proved, against the opinion of Arnold, that the spheno-palatine 

 ganglion does not form a exception, and that it likewise receives 

 filaments from a cranial nerf which presides over movement. All 

 these ganglia (ophthalmic, spheno-palatine , otic, and sub-maxil- 

 lary) having been described with details suitable to the trifacial 

 nerve, I have only to remind the reader that the common motor 

 oculi or the facial nerve furnishes their motor roots, whilst the 

 glosso-pharyngeal or the trifacial sends to each of them the sensi- 

 tive roots."] 



2. N. alveolaris inferior, descends at first between m.pterygoid. 

 extern, and internus, then between internus and the ramus of the 

 lower jaw, separated by an aponeurosis from n. lingual and m. 

 pteryg. intern, through foram. alveolare poster, in the canal, alveo- 

 laris in the same sheath with art. dental, inferior. From this 

 branches are given off to each root of the inferior molar teeth. As 

 far as the entrance to the canal the ram. mylo-hyoideus accompa- 

 nies it ; in the canal it bifurcates at foram. mentale into two rami : 



a. Ramus dentalis incisivus, very fine, passes farther along 

 the canal, and supplies the cuspidati and incisor teeth. 



b. Ramus mentalis, stronger, passes out at the foram. mentale, 

 ramifies in the skin and mucous membrane of the under 

 lip, particularly at its free border, and forms, with n.facialis, 

 a plexus mentalis. 



3. N. lingualis, the nerve of the sense of touch and sensation 

 of the tongue, corresponds to n. nasalis and palatinus of the first 

 and second division, is situated farther forwards than the last, 

 takes a curve forwards and downwards, at first between m. ptery- 

 goideus extern, and pharynx, then between the two pterygoidei, 

 pteryg. internus and the ramus of the lower jaw ; thence directly 

 forwards along the superior border of the sub-maxillary gland, 

 between this and the mucous membrane of the mouth, above m. 

 mylo-hyoideus, lastly obliquely beneath the sublingual gland, on 



