Journal of comparative neurology . P ^ §^6l^ ^ 1 >. iCiinliiiiicilJrtiiii //(/< Iluo iiiidiilla aiicriis [). Here as clsowlicrc, the cpciKlyina siinouiidiii^the rourtli ventricle doubt less functions as a inodilieil chorioid plexus, discharg-ing eorebro-spinal fluid into the fourth ventricle. It will be seen that the cavityof the fourth ventricle is smaller than the i)e(!uliarly modified central canal androof exi)ansion cavity of the Polistotrema spinal cord portra\cd in h^ures 10 to13. X 25. 65 A more caudal section through the extreme tip of the posterior lobes ofthe mesencephalon

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Journal of comparative neurology . P ^ §^6l^ ^ 1 >. iCiinliiiiicilJrtiiii //(/< Iluo iiiidiilla aiicriis [). Here as clsowlicrc, the cpciKlyina siinouiidiii^the rourtli ventricle doubt less functions as a inodilieil chorioid plexus, discharg-ing eorebro-spinal fluid into the fourth ventricle. It will be seen that the cavityof the fourth ventricle is smaller than the i)e(!uliarly modified central canal androof exi)ansion cavity of the Polistotrema spinal cord portra\cd in h^ures 10 to13. X 25. 65 A more caudal section through the extreme tip of the posterior lobes ofthe mesencephalon (cerebellum of Miss Worthington), its exact plane beingindicated by line 65 in figure 63. It will be seen that the fourth ventricle of theembryo has in this region of the adult become reduced to three small longitudinalcanals (. V.), which are nnbedded in a rather large, dense, and vascular epen-dymal mass. The most dorsal of these canals contains Reissners fiber. Hereagain the ependymal walls are probably functional as a modified chorioiod plexus

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Keywords: ., bookauthorw, bookcentury1900, bookdecade1910, booksubjectmedicine