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Show De Infundibulo. Book Ill. Ventricles, as fo many Cifterns of warry humors which clifclnréc them{61m by the Infimc/i‘u/zrm, as a common Pipe into the Gland/114 rPin/- imrid. C H AP; XLVI. . r Theotlier Colatorres by which Nature defaecatcs the Blond, are the in- (1" numerablc Glands interwoven with Arteries and Veins in the @lcxw Cbaroei- (10;, into which a large fource of Blood is impelled by the Carotidc and De Infundibulo. Vertebral Arteries, whofe fmaller Branches being inferred into the munc- rous Choroeidal Glands,do tranfmit in Hydropiclt Conftitutions, great quanti- ']-"l-Ie Infundibnlum borroWeth its denomination from the likentfs it hath with a Tunnel, whofe upper part is of a larger circumfe. rence, and groweth leITer and lefser after, it defcendeth lower and lower, ending almofl; in a Cone‘, But in truth if the Infnndibulnm be curioufly viewed, the Cavity above is very little different from that be. low, running all along almofi in an equal magnitude, for the Infnna'i. [mlum is for the molt part a narrow uniform pafsage of an OrbicularFi. gure, and hath been obferved (though rarely) to be irregular, fomctimes of acute and other times of obtufe Angles, arifing out of the Pit Mater, where it invefleth the Bafe of the Brain. Plempim, hath obferved it to be enwrapped in another mofl; thin Membrane, of inoft acute fenfe, whenee Learned Sneidcr is of an opinion, that no {harp Sertfirs Recrem‘ents can be admitted into the Infundilzrrlrw without great moleftation. Its firf'c origen is larger, placed near the Foramen of the third Ventriele, and is every way continued in its Medullary fubf'tance to the F0ramen of the fourth Ventricle, being of the fame dimenfions with it, for the Infimdibnlmn confifteth of a double fubfiance, the firfl: and outward is membranous, and the other fomewhat medullary or pulpy. _, RENEE About the middle region of the Infimdibulmu are leated two whttilh "cmhmd Glands 1n Humane Brains , but in Brutes only one, but far exceeding 3,2531%!" the other in magnitude, and feem to be 'conl‘rituted on this account in33:,th f'cead of two foft Pillows made to fecure the thin tender Membrane ' of the Infimdilmlum to refi upon, and to conferve it in its proper place on the one fide, being fupported on the other by the united Candexof the Opticlt Nerves. ‘r‘hccl'ffnudfldjt ‘ But it may he demanded to what end ferveth the Iizfitzzdilmlum? T0 Mum. receive the Recrenients rranfmitted from the Brain and Cerebellar/z to the four Ventricles, and thence to convey them to the Glandule @iminrrir. But it may he further enquired after what manner and "'W F5 Serous Superfluities are communicated to the Chambers of the Brain, and from thence to the [nfmzclibulumP To Which this reply may he made, That the Brain and Cci'cbellim'z and Glands of the Plcxes are f0 many Colatorics of the Blood, by which it is depurated from its Facet, Wh‘" afterward diflill into the Ventricles, and lnftmdibu/um, which i5 C "fled firfl: as to the Brain after this manner, In Hydropick and moil‘t BOdlfiv the Blood being7 depraved with Serous Liquors, is carried by the Clio‘ tides into the fubftance of the Cortex, uhofe Glands do not only {CPJ' rate the more foft part of the Vital Liquor, and convey it into the EX‘ t'remiries of the Fibres, but in cafe of any exigence, do make a feat" [ion (as l conceive) of the watry cmulencies, and tranfmit fem through the ferret Merrrm" of the Com-x and Carpm Calla/1m], intovtf tn- tiesol Serous Blood into the fubl'tance ofthem, where a Percolation is made of [he watry Saline, from the more pure and Alimentary parts of the Blood aand if the Serous are fo Luxuriant, that they cannot be entertained into the fmall Extremities of the Jugulars, the body of the Glands grow immediately fwelled, and the Watry Reeremcnts having more and more recourfe to the Ambient parts of the Glands, do force their way through the {mall iufeuftble Mattias of the Membranes, encircling the Glands, into the Ca. vitics of the Ventricles, as fo many dreins of the Brain, and are thence derived to the Infundz'bulum, and Glandula ?itz¢itaria. After the fame manner the Blood is refined inthe Cerebellum, which be- ing difpenfed by the Vertebral Arteries into an eminent Plex, is feared in the Cerebrllum,is thence derived by fmaller Branches implanted into fruitful fmall Glands 1-, in whofe fubftance the Serous being, flreined from the more nonrifhing Particles, and if the Watry Humors are to exuberant, that they cannot be returned by the Veins, Nature findeth out another way to free it felf from its burden through the feeret palfages of the Coates enwmpping the Glands into the fourth Ventricle neighbouring upon the Confines of the (arc- bellum. |