. Contributions from the Department of Neurology and the Laboratory of Neuropathology (reprints). third branch of the fifth orboth the second and the third branches of the fifth were directlyor indirectly severed, the fifth nerve supply indicated was to thetragus and anterior part of the canal, much the same as that de-termined by Gushing. After trigeminal section this region ofthe ear is not insensitive to all forms of sensation. It mayrespond to painful stimuli, but not to examination with the hairesthesiometer or with a small camels hair brush. These findings SENSORY FUNCTIONS OF SEVENTH NE
. Contributions from the Department of Neurology and the Laboratory of Neuropathology (reprints). third branch of the fifth orboth the second and the third branches of the fifth were directlyor indirectly severed, the fifth nerve supply indicated was to thetragus and anterior part of the canal, much the same as that de-termined by Gushing. After trigeminal section this region ofthe ear is not insensitive to all forms of sensation. It mayrespond to painful stimuli, but not to examination with the hairesthesiometer or with a small camels hair brush. These findings SENSORY FUNCTIONS OF SEVENTH NERVE. 295 are in accord with tliose of Cusliing who found a narrow stripof lost tactual sensibility bordering his large general area ofcomplete anesthesia after trigeminal section. It is probable that in the compacted space which forms theexternal auditory meatus the overlap of the dififerent neural sup-plies to the ear—the trigeminal, great auricular (cervical), vagaland possibly the glossopharyngeal—is such that section of anyone of the nerves going to the auricle will not cause complete. Fig. 2. Tactile changes following section of the great auricularnerve. Examination twenty-four hours after section. Vertical shadingdenotes anesthesia to camels hair brush; horizontal shading denotes areaabnormal to stroking touch. (Trotter and Davies.) anesthesia. As determined by Head in his investigations on themedian and other nerves if one nerve is cut, as the median, thearea of complete protopathic loss is smaller than that for theother forms of sensibility, protopathic sensibility being preservedin the area of section through overlap of the adjoining nervesupply, in the case of the median for instance, by ulnar care should be taken in drawing conclusions in casesof supposed gasserian extirpation or of section of the sensoryroot of the trigeminus. Not infrequently this extirpation is 296 CHARLES K. MILLS incomplete and it sometimes happens that the sensory root isnot c
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