. Contributions from the Department of Neurology and the Laboratory of Neuropathology (reprints). he homology between the dorsalspinal ganglia and the cranial ganglia—gasserian, petrous,jugular, and geniculate—without acknowledging that the func-tions of these ganglionic systems are the same as those of thespinal ganglia with their afferent nerves. Let us now turn to this question of homologies as indicatedby embryology. In the process of evolution the geniculateganglion, and to a large extent in all probability the petrous SENSORY FUNCTIONS OF SEVENTH NERVE 2S9 ganglion, has become transferre
. Contributions from the Department of Neurology and the Laboratory of Neuropathology (reprints). he homology between the dorsalspinal ganglia and the cranial ganglia—gasserian, petrous,jugular, and geniculate—without acknowledging that the func-tions of these ganglionic systems are the same as those of thespinal ganglia with their afferent nerves. Let us now turn to this question of homologies as indicatedby embryology. In the process of evolution the geniculateganglion, and to a large extent in all probability the petrous SENSORY FUNCTIONS OF SEVENTH NERVE 2S9 ganglion, has become transferred in its functions to the senseof taste. Possibly some vestigial cutaneous afferent fibers maybe present in the geniculate system, but this is all that with theevidence can be asserted. Dixon, for instance, holds that in fishes and in lower air-breathing vertebrates the palatine and prespiracular nerves takeorigin together from the ganglion which is the homologue ofthe geniculate ganglion in man, while the post-spiracular on theother hand corresponds to the efferent motor facial. He shows. Fig. I. Diagram to illustrate the sensory distribution of the facialnerve in man (Dixon). The sensory functions of the seventh nerve ashere indicated are gustatory. The great superficial petrosal nerve (Vila)is a nerve of taste from the soft palate to the geniculate ganglion. Thechorda tympani nerve (Vllb) is the nerve of taste from the anterior twothirds of the tongue, except its tip, to the geniculate ganglion. The motorfacial is indicated hy VIIc. The gasserian ganglion and the three branchesof the fifth are shown in the diagram. that the great superficial petrosal nerve in man corresponds tothe palatine, and the chorda tympani to the prespiracular, thesenerves both in lower animals and in man going to regions whichare especially concerned with the function of taste. The limitsof this article will not permit a discussion of the details on which 290 CHARLES K. MILLS these opinions are f
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