Diseases of the nervous system : a text-book of neurology and psychiatry . in prick,central pain and affective over-response. Trophic disturbances, usually due toperipheral disease (?), cause changesin the gums and mucous membranes,ulcerations, herpetic eruptions. Cor-neal ulceration and loosening of theteeth are often present, but whethertrophic or not is not certain. Dissociation of pain and tempera-ture from epicritic touch sensibilitymay take place in the trigeminusdistribution. For lack of space herea complete analysis of sensibility dis-turbances of the trigeminus shouldbe sought in spec
Diseases of the nervous system : a text-book of neurology and psychiatry . in prick,central pain and affective over-response. Trophic disturbances, usually due toperipheral disease (?), cause changesin the gums and mucous membranes,ulcerations, herpetic eruptions. Cor-neal ulceration and loosening of theteeth are often present, but whethertrophic or not is not certain. Dissociation of pain and tempera-ture from epicritic touch sensibilitymay take place in the trigeminusdistribution. For lack of space herea complete analysis of sensibility dis-turbances of the trigeminus shouldbe sought in special monographs.(See Lewandowsky, Handbuch derNeurologie, for complete literature—1910-1912.) Progressive Facial Hemiatrophy.—This rare condition, which shows atits onset a gradual thinning, with wrinkling of the skin about the orbit or jaws, with later progressiveatrophy of the bones, cartilages and muscles, also of the tongue andsoft palate, without sensory signs or reaction of degeneration is attimes a result of peripheral or pontine (nuclear) disease of the fifth. Fig. 103.—Syringomyelia, beginningas hemifacial atrophy, then developingMorvans disease, and finally show-ing classical syringomyelic end lesions.(Hammond.) nerve. DISEASES OF THE FACIAL NERVE. Seventh Nerve.—The seventh nerve is a mixed nerve. The corticalorigin of the motor neurone occupies the lower third of the precentralconvolution, from here the fibers pass through the knee of the internacapsule, through the middle third of the peduncle and make theiifirst junction (possibly by means of intercalated neurones) with the 216 SENSORI-MOTOR NEUROLOGY—CRANIAL NERVES homo- and contralateral seventh nerve nuclei in the tegmentum ofthe pons, just ventrolateral to the abducens nerve nucleus. Fromthese nuclei, four in number are usually described, the second motor
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