A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . leus of the fasciculus solitarius and fromthe reticular formation for short reflexes connectedwith the cerebral nerves. The cortical path arisesfrom the opercular part of the frontal lobe, passesdownward through the genu of the internal capsuleinto the pyramidal tract, whose most medial fibersit forms (Fig. 9M, Tr. 7n.), then below thepons it bends dorsalward to cross the raphe andenter the XII. nucleus from the lower and inner side. 311 Brain, Anatomy
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . leus of the fasciculus solitarius and fromthe reticular formation for short reflexes connectedwith the cerebral nerves. The cortical path arisesfrom the opercular part of the frontal lobe, passesdownward through the genu of the internal capsuleinto the pyramidal tract, whose most medial fibersit forms (Fig. 9M, Tr. 7n.), then below thepons it bends dorsalward to cross the raphe andenter the XII. nucleus from the lower and inner side. 311 Brain, Anatomy of REFERENCE HANDBOOK OF THE MEDICAL SCIENCES The Formatio Reticularis.—The nuclei of the cere-bral nerves which have been enumerated above con-stitute the primary intrinsic sensori-motor apparatusof this region. Between these nuclei lies the retic-ular substance, by means of whose neurones the vari-ous reflex arcs with wliich these primary centers are corpusresTiforme nuc. funic,gracilis etCuneaTus \v. olivo<ereb. TrQCT(Flechsig) brachiumconjuncTivurn TrtecTo-ceretx ,tr. ponto-cerefcL mesenc. Tk spine. -ollvaris Fig. 932. ^olivQ interior^venTro-lat cereb. tract (Gowers) -Diagram of the Chief Afferent Tracts Connected with the Cerebellum. nuc. d concerned are completed. The olivary nuclei, the pon-tile nuclei, the arcuate nucleus and some other espe-cially elaborated gray centers represent more highlydifferentiated areas within the reticular formation,whose connections will be taken up in more detailbeyond. The cerebellum is an extensive supraseg-mental apparatus developedfrom this region to serve theproprioceptive functions ofequilibration and muscular co-ordination, largely or whollyon the reflex or involuntaryplane. The Cerebellum.—To themetencephalon, as this term ishere used, belong the cerebel-lum (epencephalon), pons,brachium pontis, and nuclei These constitute a ^ functional unit, which is re- COrpUS restitormelated by means
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