Diseases of the nervous system .. . means of the foramen Monroi, throughwhich also we pass to the third ventriclein the cavity of the diencephalon. Thelatter is limited laterally by the opticthalamus, and above by epithelium fromthe choroid plexus, while it passes down-ward in funnel shape into the infundibu- lum. Through the comparatively wide third ventricle we pass dorsally to thenarrow aqueduct of Sylvius, the canal of the mesencephalon, the upper bound-. FiG. 2.—The Developmext of the Ven-tricular System. (After Welcker.) IV, Fourth ventricle; , Recessus later-alis; a., Aquaeductus Sy
Diseases of the nervous system .. . means of the foramen Monroi, throughwhich also we pass to the third ventriclein the cavity of the diencephalon. Thelatter is limited laterally by the opticthalamus, and above by epithelium fromthe choroid plexus, while it passes down-ward in funnel shape into the infundibu- lum. Through the comparatively wide third ventricle we pass dorsally to thenarrow aqueduct of Sylvius, the canal of the mesencephalon, the upper bound-. FiG. 2.—The Developmext of the Ven-tricular System. (After Welcker.) IV, Fourth ventricle; , Recessus later-alis; a., Aquaeductus Sylvii; III, Thirdventricle; i^. J/., Foramen Monroi; ,Cornu anterius; , Cornu posterius; Cornu inferius of the lateral ven-tricles; h., Pes hippocampi major. 4 MACROSCOPIC ANATOMY OF THE CENTRAL NERVOUS SYSTEM ary of which is formed by the corpora qiiadrigemina, the lateral limits by thestructures beneath, the red nucleus, the lemniscus tracts, etc., while the cere-bral peduncles are found upon the floor. In the region of the metencephalonthese canals dilate and form the fourth ventricle, the so-called rhomboidfossa, the roof of which is formed by a thin membrane, the tela chorioideaposterior, above which w^e find the layers of the cerebrum developed fromthe dorsal wall of the occipital vesicles; this structure with its arms whichextend to the other parts of the brain forms the lateral boundary of the fourthventricle, while the mass of t
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