. The American journal of anatomy. than that occupied bythe combined nuclei of the glossopharyngeus, vagus and would be out of all proportion to the function of the vestibularnerve, as we at present understand it. Secondly. In many human speci-mens where the striae are absent or only faintly marked, and evenbetter in other mammalians (calf and sheep), the naked eye appearanceof the floor shows the vestibular nucleus to be separated from the nucleusintercalatus by the lateral furrow which connects the superior andinferior foveae. Thirdly. We have already seen that in neuroglia
. The American journal of anatomy. than that occupied bythe combined nuclei of the glossopharyngeus, vagus and would be out of all proportion to the function of the vestibularnerve, as we at present understand it. Secondly. In many human speci-mens where the striae are absent or only faintly marked, and evenbetter in other mammalians (calf and sheep), the naked eye appearanceof the floor shows the vestibular nucleus to be separated from the nucleusintercalatus by the lateral furrow which connects the superior andinferior foveae. Thirdly. We have already seen that in neuroglia fibrespecimens, processes extend from the ependyma ventrally into the greymatter forming partitions between the dorsal nuclei. In specimensof this region prepared in that manner there exists a neuroglia parti- 308 Anatomy of the Floor of the Fourth Ventricle tion between the dorsal nucleus of the vestibularis and the nucleus inter-calatus. This is indicated in text fig. 2, which represents a neuroglia Nucl vestibularis Slna medull. Fasc, solitar. Nucl. funic, teretis Text Fig. 2. Neuroglia preparation made in the region corresponding to fig. 6, inPlate IV. The magnification is the same as text tig. 1. fibre preparation taken from the region under consideration. In sec-tions from other specimens we have observed a distinct notch in thefloor at the point indicated in text fig. 2 by a cross. These would cor-respond to brains with a well marked lateral furrow. As bearing on this subject, I may further mention a case, reportedby ISTeubiirger and Edinger (Berliner klin. Wochenschr., 1898, No. 4),in which there was a congenital absence of one-half of the the abnormal side the vago-glossopharyngeal and vestibular nucleiwere found to be devoid of the network of fine fibres, which presumablyforms the origin of their central cerebellar sensory tract. The nucleusintercalatus was not described. I have recently, however, had theopportunity of examining the preparations from thi
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