A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . ticacrossed by strise-acusticffi. Fovea inferior- Trigonum,bypoglossi Metaplexus Postcere^ bellar arterj Vertebral artery Fig. 904-—The Metapore (Foramen of Magendie) and AdjacentParts. The left tonsilla of the cerebelliun has been removed toexpose the underlying parts. Cf, Fig. 141. /, Velum medullareposterius; //, lateral recess of the fourth ventricle; ///, flocculus;IV, plexus chorioideus lateralis; VII, VIII, IX, cerebral nerves.(After Henle and Wilder.) the c
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . ticacrossed by strise-acusticffi. Fovea inferior- Trigonum,bypoglossi Metaplexus Postcere^ bellar arterj Vertebral artery Fig. 904-—The Metapore (Foramen of Magendie) and AdjacentParts. The left tonsilla of the cerebelliun has been removed toexpose the underlying parts. Cf, Fig. 141. /, Velum medullareposterius; //, lateral recess of the fourth ventricle; ///, flocculus;IV, plexus chorioideus lateralis; VII, VIII, IX, cerebral nerves.(After Henle and Wilder.) the cerebellum itself overlaps practically all of themedulla oblongata. The roof of the fourth ventricle is formed, in itsmiddle part, by the cerebellum. The anteriorportion of the roof is a thin sheet of nervous substance,the anterior medullary velum, which stretches between Inferior c[uadrigeminal bodyFourth nerve Superior cerebellar; peduncle * Fovea superior Middle cerebellar pedimcleSuperior cere- bellar peduDcle Inferior cere-bellar peduncle -btris acusticse -Area acusticae ? Trigonum vagiFuniculus separansArea postrema. --Funiculus cuneatus. Fig. 903.—The Medulla ObIong:ii;i ^^ca frum ibove with the M, :rMu< Ko .f of the Fourth Ventricle removed The right h^ oithe cerebellum has been cut away and the left half has been drawn over to the left so as to expose the floor of the fourth ventncie.(From Cunninghams Anatomy.) 292 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Brain, Anatomy oT tliR ceribclluin and the superior cerebellar velum contains a tract of nerve fibers passingbetween the roof of the midbrain and tlio cerebellum,the tract us tecto-ccrebellaris, a connection which haslong been known iii lower vertebrates, but has onlyrecently been discovered in mammals (Edinger).The lower portion of the roof of the fourth ventricleincludes the inferior medullary velum, which bordersthe cerebellum, and a non-nervous tela the lower jjart of the
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