Diseases of the nervous system .. . NIL Decussated fibres oscendinqfrom th c spinol cord Fig. 53.—Section through thk Medulla Obloxgata atTHE Point of Exit of the Pneumogastric. (Diagramafter Edinger.) kirroa. ^ ^^po^^i Fig. 54.—Section through the Medulla Oblongata at the Height of the PosteriorHypoglossal Roots. (Diagram after Edinger.) 60 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM 48), is external to that chain of nuclei with which we have just becomeacquainted. Although a motor nerve, we find it in the region of the sensorynuclei of the medulla. Functionally it resembles the anterior horn cel
Diseases of the nervous system .. . NIL Decussated fibres oscendinqfrom th c spinol cord Fig. 53.—Section through thk Medulla Obloxgata atTHE Point of Exit of the Pneumogastric. (Diagramafter Edinger.) kirroa. ^ ^^po^^i Fig. 54.—Section through the Medulla Oblongata at the Height of the PosteriorHypoglossal Roots. (Diagram after Edinger.) 60 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM 48), is external to that chain of nuclei with which we have just becomeacquainted. Although a motor nerve, we find it in the region of the sensorynuclei of the medulla. Functionally it resembles the anterior horn cells ofthe spinal cord pressed into the median line and dorsally (by the pyramidaldecussation through the reticular substance and the lemniscus tract), whilethe anterior motor cerebral nerve nuclei retain their position like the ante-rior horns of the spinal cord. Its caudal beginning, at about the heightof the pyramidal decussation, occupies a corresponding position with that ofthe anterior horns of the spinal cord, ventrally close beside the nucleiof the spinal accessory. Frontally, however, the hypoglossal turns to themedian line, and simultaneously into the dorsal area of the medulla, so thatat the
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