Organic and functional nervous diseases; a text-book of neurology . the entrance of the fifth nerve produce anaesthesia of the face onthe side of the lesion only. They then join the general sensory tractin the lemniscus and formatio reticularis and pass to the cortex in thelower third of the sensory motor area. (See page 106.) There is a long semilunar-shaped group of cells which lies on thelateral border of the gray matter lining the aqueduct of Sylvius, in thesubstance of the tegmentum, and extends for four millimetres beneaththe corpora quadrigemina posterior. These cells resemble the cells
Organic and functional nervous diseases; a text-book of neurology . the entrance of the fifth nerve produce anaesthesia of the face onthe side of the lesion only. They then join the general sensory tractin the lemniscus and formatio reticularis and pass to the cortex in thelower third of the sensory motor area. (See page 106.) There is a long semilunar-shaped group of cells which lies on thelateral border of the gray matter lining the aqueduct of Sylvius, in thesubstance of the tegmentum, and extends for four millimetres beneaththe corpora quadrigemina posterior. These cells resemble the cells ofthe column of Clarke in the spinal cord and are large and send axones downward in a long descending nerve root which issemilunar in cross-section and which enters the fifth nerve root oppo-site its exit at the level of the motor nucleus of the nerve. Some 650 THB CBANIAL NERVES AND THEIR DISEASES. authorities ascribe motor functions to this group of cells and root,though they were found to be normal in a case where paralysis of the Fig. Scheme of the neurones making up the fifth or trigeminal nerve. (Edinger.)^ W. A. Turner, Allbutts System of Medidne, vol. VI., p. 787. THE FIFTH NEBVE: TBIGEMINAL NEEVE. 651 muscles of jtnastication was present and where the motor nucleus ofthe nerve was degenerated. Other authorities ascribe trophic functionsto this group of cells and root, and affirm that they are diseased incases of hemiatrophy of the face. This statement is made by Mendel ^on the basis of one case only. Others still regard them as a part ofthe sensory root. The sense of taste is a part of the function of the fifth nerve, forcomplete division of this nerve behind the Gasserian ganglion suspendsthis sense. The nerves through which this sense is conveyed are two :1. The anterior two-thirds of the tongue sends sensations of tastethrough the lingual nerves and chorda tympani, which passes into the Fig. 278.
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