Diseases of the nervous system .. . culi • Lemniscus medialis;r=--r><\ (sensitivus) Stria medullaris (acustica) Decussatio lemniscorumSubstantia gelatinosa^ Nucleus funiculi cuneatiNucleus funiculi gracilis Funiculus cuneatus?^ Funiculus gracilis Fig. 87.—Diagram of the Lemniscus Tract (the Medial in Black, the Lateral in Red). The tubercnlum acusticum of the nerve of hearing sends its nerve fibersdorsally around the corpus restiforme into the stricB acousticce of the rhomboidfossa (Fig. 94). They pass through the middle of this, and then sink ven- 92 HISTOLOGY OF THE CENTRAL NERVOUS SYS
Diseases of the nervous system .. . culi • Lemniscus medialis;r=--r><\ (sensitivus) Stria medullaris (acustica) Decussatio lemniscorumSubstantia gelatinosa^ Nucleus funiculi cuneatiNucleus funiculi gracilis Funiculus cuneatus?^ Funiculus gracilis Fig. 87.—Diagram of the Lemniscus Tract (the Medial in Black, the Lateral in Red). The tubercnlum acusticum of the nerve of hearing sends its nerve fibersdorsally around the corpus restiforme into the stricB acousticce of the rhomboidfossa (Fig. 94). They pass through the middle of this, and then sink ven- 92 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM trally in the raphe clown to the level of the corpus trapezoideum and ascendin the lateral lemniscus together with fibers from the corpus trapezoideumand its nerve nuclei. The path of the fibers of the dorsal nucleus of the auditory nerve (vestib-ular nerve) is still unknown. As to the second neuron of the trigeminal nerve, , the fibers of itselongated sensory nucleus which pass out centripetally, and which for a long. Fig. 88.—Origix of the Facial Nerve A^^D its Surroundings, the Fibers of theAuditory Nerve and its Nuclei. (After Edinger.) time could not be traced, the subject has been illumined by the investigationsof Edinger, Wallenberg and Ramon. On the opposite side of the medullaoblongata they pass upward into a region which is designated as the substantiareticularis or as Bechterews central tegmental tract (Figs. 89, 94-96) ; thatis, such a tract has ])een located in animals. It extends dorsally and somewhatlaterally from the median lemniscus up to the middle brain and through thisto the thalamus. In the middle brain, therefore in the region of the corpora quadrigemina,the lemniscus appears as the continuation of the second sensory neuron of thespinal cord, the glosso-pharyngeus-vagus, the auditory, and probably also ofthe trigeminal nerve. Here it extends dorsall} from the substantia nigra, butventrally below the decussation of the peduncles, to the cerebe
Size: 1557px × 1604px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpu, booksubjectnervoussystem
