A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . fibers,as well as the optic fibers, end in the midbrain, veryfew passing on without interruption into the thal-amus. From the tectum mesenccphali importantreflex connections are effected with the underlyingmotor centers of the tegmentum and with lowermotor centers by important tecto-bulbar and tecto-spinal tracts. The midbrain connections of theoptic system in the human brain are of this type,only the simpler visual reflexes being localized here;see Fig. 950. The t
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . fibers,as well as the optic fibers, end in the midbrain, veryfew passing on without interruption into the thal-amus. From the tectum mesenccphali importantreflex connections are effected with the underlyingmotor centers of the tegmentum and with lowermotor centers by important tecto-bulbar and tecto-spinal tracts. The midbrain connections of theoptic system in the human brain are of this type,only the simpler visual reflexes being localized here;see Fig. 950. The thalamic connections ot the optic tracts inthe lowest vertebrates are very insignificant, col-laterals of this system being given off to terminatein the unspecialized tissues of the parsdorsalis thalami. But in all forms with a differen-tiated cerebral cortex these thalamic optic connectionsassume greater importance, a special part of thepars dorsalis being set apart for their use. Thusarises the lateral geniculate body, and in highermammals this is supplemented by the pulvinar. These CORP CALIOSUM T^ LIMBCAPSULF. LOBE. Fig. 949.—Scheme of the Thalamo-cortical Connections,Founded on the Observations of Flechsig, and Ferrier and Turner.(From Cunninghams Anatomy.) 319 BralD, Anatomy of REFERENCE HANDBOOK OF THE MEDICAL SCIENCES
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