. Diseases of the nervous system : for the general practitioner and student. ed by thecerebellum and superior cerebellar peduncles. It is covered by a laminaof white matter, the anterior medullary velum, the inferior portion ofwhich is continuous with the white substance of the cerebellum. The middle portion is covered by the posterior medullary velum,which is also continuous with the white substance of the cerebellum. The inferior portion is covered by an epithelial membrane (tela chorio-idea), a double fold of the pia containing vascular processes, viz. choroidplexuses. The thickened lateral
. Diseases of the nervous system : for the general practitioner and student. ed by thecerebellum and superior cerebellar peduncles. It is covered by a laminaof white matter, the anterior medullary velum, the inferior portion ofwhich is continuous with the white substance of the cerebellum. The middle portion is covered by the posterior medullary velum,which is also continuous with the white substance of the cerebellum. The inferior portion is covered by an epithelial membrane (tela chorio-idea), a double fold of the pia containing vascular processes, viz. choroidplexuses. The thickened lateral portions of the tela are called ligulaeand the thickened portion of it at the calamus is called obex. The Margins of the fourth ventricle. i6 THE CENTRAL NERVOUS SYSTEM The superior borders are formed by the superior and middle cerebellarpeduncles, the inferior by the restiform bodies and the terminations ofthe posterior columns of the cord. Interior of the Medulla and Pons. —Sections beginning from thelower level of the medulla upward show the gradual formation of the. Fig. 13.—Section of Medulla Oblongata Near the Pons. (Santee.) a. Hypoglossal nucleus, b. Vestibular nucleus, c. Tractus solitarius. d. Restiform Substantia reticularis. /. Hilus of olivary nucleus containing cerebello-olivary fibers, lateral sulcus, h. Pyramid, i. Anterior median fissure, j. Anterior longitudinalbundle, k. Medial longitudinal bundle I. Nuc. tractus spinalis n. trigemini. m. Tractusspinalis n. trigemini. n. Lateral cochlear nucleus. 0. Ventral cochlear nucleus, p. Ascend-ing anterior cerebello-spinal, spino-thalamic and rubro-spinal tracts, q. Posterior lateralsulcus, r. Medial fillet, interolivary stratum, s. Anterior external arcuate fibers, t. Arcuatenucleus. Pyramids. They are formed, properly speaking, of the pyramidal fibersdescending from the cerebral peduncles through the deep and superficialfibers of the pons. At the lower level of the medulla they begin todecuss
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnervous, bookyear1913
