Nervous and mental diseases . ne-fited by a tenotomy. Muscle cutting should always be preceded byexercise of the muscles with prisms, wliicli sometimes is helpful, and bygeneral treatment. Nystagmus, excepting in the unusual cases where itis due to meningeal and sinus diseases, or other curable lesion, is prac-tically unyielding to all measures. Miners nystagmus usually ceaseswhen the occupation is changed. 116 DISEASES OF THE CRANIAL NERVES. CHAPTER V. DISEASES OF THE TRIFACIAL NERVE. Anatomical Considerations.—The fifth nerves represent the sen-sory portions of all the motor cranial nerves.
Nervous and mental diseases . ne-fited by a tenotomy. Muscle cutting should always be preceded byexercise of the muscles with prisms, wliicli sometimes is helpful, and bygeneral treatment. Nystagmus, excepting in the unusual cases where itis due to meningeal and sinus diseases, or other curable lesion, is prac-tically unyielding to all measures. Miners nystagmus usually ceaseswhen the occupation is changed. 116 DISEASES OF THE CRANIAL NERVES. CHAPTER V. DISEASES OF THE TRIFACIAL NERVE. Anatomical Considerations.—The fifth nerves represent the sen-sory portions of all the motor cranial nerves. Their sensory distributionembraces most of the skin of the head and face^ all their mucous mem-brane-lined cavities, and the cerebral meninges in part. The exactlimits of this sensory field have been worked out by Gushing in anumber of cases subjected to extirpation of the ganglion of Gasser, andare shown in Fig. 39 A. In addition, through at least the chordatympani, the fifth subserves the special sense of taste. Its small. Fig. 39 A.—Diagram showing the normal (average) field of postoperative cutaneous shaded area, inchiding tragus and anterior wall of meatus, remains anesthetic to tactual (hair esthe-siometer) stimuli. The dotted strip gives the impression of touch or pressure to pain stimuli (needle),vfith few if any actual pain points (Gushing, in Bull. Johns Hopkins Hosp., July-Aug., 1904). motor root innervates the mandibular muscles of mastication. Thenuclear origin of the fifth nerve in the medulla is correspondinglyextensive. The smaller motor nucleus is situated under the floor of thefourth ventricle near its lateral angle, with an upward extension as highas the corpora quadrigemina. Outside of this is the larger sensorynucleus, Avhich is connected continuously with nuclear gray matter aslow as the fourth cervical spinal segment. These centra are broughtinto relation with the cerebellum and with the cerebral cortex byupward radiations. For the moto
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