Diseases of the nervous system .. . leus sensibilis n. trigemini (Substantia gelatinosa) Radix spinalis n. trigeminiNucleus Fila radicularia olivarissuperiorCorpus trapezoideum Raphe pontis Fasciculi longitudinalis(pyramidales) pontis Sulcus basilaris Fig. ^Transverse Section through the Lower Border of the Pons ImmediatelyAbove the Olives and through the Middle of the Fourth Ventricle. (After Toldt.) 96 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM fibers (fibers of the acoustic) terminate in the medial geniculate body. Thecourse of the lemnisci may well be follow
Diseases of the nervous system .. . leus sensibilis n. trigemini (Substantia gelatinosa) Radix spinalis n. trigeminiNucleus Fila radicularia olivarissuperiorCorpus trapezoideum Raphe pontis Fasciculi longitudinalis(pyramidales) pontis Sulcus basilaris Fig. ^Transverse Section through the Lower Border of the Pons ImmediatelyAbove the Olives and through the Middle of the Fourth Ventricle. (After Toldt.) 96 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM fibers (fibers of the acoustic) terminate in the medial geniculate body. Thecourse of the lemnisci may well be followed in the illustrations from 90 to 99,which clearly portray the general position of the tracts in the trunk of thebrain. Dacussatio nn. trochlearium —^.Ventricuius quartus (upper portion) •—.^ Lemniscus lateralis —Brachium conjunctivum Substantia reticularis grisea Lemniscus medialis Velum medulare anterius Radix n. trochlearis Bundle passing —from the fdletinto the crustaof the cerebralpeduncle Raphe pontis Nuclei pontis. Radix descendens (mesencephalioaa. trigemini Substantia ferruginea Fasciculus longitudinalis —. Pars dorsalis frori Fibrse pontisprofundae Fasciculi longtudinalis (pjmidalis) Pars basilaris pontisFibrse pontis superftciales Fig. 96.—^Transverse Section through the Middle of the Pons and the Anterior Med-ullary Velum. (After Toldt.) We must now study the continuation of the optic and olfactory nervesafter leaving their nuclei. For a reason to be immediately mentioned, I shall omit the secondary optic tract, andshall pass at once to the olfactory. Thisrises from the cells of the bulbus olfac-torius which have already been describedas their glomeruli. From this point thefibers run but a short distance only. Theygradually pass into the gray substance ofthe optic tract which immediately joins thebulbus posteriorly and terminate in its part appears to run on posteriorlyto the point where the tractus olfactoriusarises from two roots, one
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