The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ine with theposterior end of the corpus callosum, where it is continuous with theexternal pia mater; its lateral margins are fringed by the choroidplexuses, which are seen in the bodies and descending cornua of thelateral ventricles, where they are invested by the endothelial liningof those cavities. Its apex, where the two choroid plexuses blendwith each other, lies just behind the anterior pillars of the interval between the apex and these pillars is the aperture ofcommunication betwee
The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . ine with theposterior end of the corpus callosum, where it is continuous with theexternal pia mater; its lateral margins are fringed by the choroidplexuses, which are seen in the bodies and descending cornua of thelateral ventricles, where they are invested by the endothelial liningof those cavities. Its apex, where the two choroid plexuses blendwith each other, lies just behind the anterior pillars of the interval between the apex and these pillars is the aperture ofcommunication between the two lateral ventricles and the third,already referred to as the foramen of Monro. The choroid plexusescontain the small choroidal arteries; and the blood from these isreturned by small veins, which join to form the veins of veins pass along the centre of the velum, and, as is shownin fig. I, open into the straight sinus. If the velum interpositumbe now carefully raised from before backward, the optic thalami,third ventricle, pineal body and corpora quadrigemina are Fig. 13.—A deeper dissection of the Lateral Ventricle, and of theVelum Interpositum. a, Lyra, turned back. b, b. Posterior pillars of the I fornix, turned back. c, c. Anterior pillars of the fornix. d. Velum interpositum and veins of Galen. e, Fifth , /, Corpus striatum. , g. Taenia semicircularis., h, Optic thalamus. k. Choroid plexus. /, Taenia hippocampi. m. Hippocampus major scending cornu. », Hippocampus minor. o, Eminentia coUateralis. in de- The optic thalamus is a large, somewhat ovoid body situated behindthe corpus striatum, and above the crus cerebri. Its upper surfaceis partly seen in the floor of the body of the lateral ventricle, but isfor the most part covered by the fornix and velum postero-inferior surface forms the roof of the descending cornu ANATOMY] BRAIN 399 of the ventricle, whilst its inner surface forms the side wall of thethird ventri
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
