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Show Book II[_ Book 111. Main; and the'Third being united to the Sepnmz incidum‘, .iri-terpoi'eth V , "v en the lower region of the anterior Ventricles, and C§t€ndctli it telrror- C H A P. XLII. 0f the Fornix. "My". I beiliierovvard the Noifrils, f0 that fame, and not Without tome (lieu! of Rezie . i2: have derived the Origen of the For-nix from them. "This admirable Proeefs from its dliT‘Cl'Cllt Surfaces, and arched Pigments-is called Fornix by the [\ntients, 'whofe gibbous region above liovfrrpleid] writ1 i. numerous Fibres, which running overthwart in various Flex.irc:,do ma it t, i: Arch of the Fornix. H E Famix + having a connexion with the Corina calla/hm, by the interpofition of the Septum lutidum) is a Medullary Proccfs, dcria ving it felf from the anterior part of the Brain, near the Corpora firiam, and being firetched out under the Fiiiure of the Brain, immediately under the Septum ( till it arriveth the hinder part of it) is conioyned to the Caudex C H A P. XLIIL of the Medulla oblongata with two Proceffes, as with two firetched out Arms; and in its Whole progrefs reprefenteth a Triangle, compounded of unequal {ides ‘, The Firfi: and fliortefl is carried from the hinder region of the Right Ventricle, to the hinder region of the Left: The other fide is placed in the Right Ventricle, and from the hinder region inclining invvard, is extended to the anterior part of the Third Ventricle; And the Third lide being pla. ced in the Left Ventricle, agreeth in length with the former i The upper re- gion that faceth the Septum lucidum, is gibbous, being invefied with aConvex-futface, and the lower region of the Fornix is endued with a Concave, and Arched Surface, but the upper is different from it as fomewhat prominent, and is united to the Septum', making a partition between the Right and Of the Corpora Striatau ~ .' ', ' V i 51"]i2'7‘tfl" He Corpora Striatd upOn the Diiicéiion ofthe Brain, iccm to be iodgtu 3‘" within the Ventricles, but upon a true infpcétion, are found to bc 3: feared without them; andI humbly conceive, that they are the OrIgCHS of i751: .. the Mfdullfl nblongam, whofe Heads {0 incline one toWards anotlicr,‘thii1t they Riga" are almolt conjoyned 5 And from the Angles ( by Which they approat iseac i W", other) the Farnix is derived with a double Origent And the La'rporie '3 1.1» m Tip-"wk Left Ventricles; in wliofe hinder region the Fomz'x is in a great part, fome~ ta feem to be united by a tranfverfe Medulla‘ry Proccfs 3 but their TCUDIDE!‘ gm; fwvm tions or leiier parts of thefe Lentiform Procefles are more acute, being tug. are". what orbicular, and feemeth in a manner to reprefent the Surface ofan obldng Sphaere; whereupon it hath impofed upon fome to think them the round pru- tied backward, and do after a manner form two fides of a Triangle, to \r ho c ., anterior Surface the Corpm CallU/itm is conyoyned for a good lpace. ‘ tuberancies, called by the Antients Nam. The Fomix in its firft rife hath two fmall white flalks, or Medullary Fi- When the Brain is Diiieé'tcd, and f0 brought to a Plain, that the Letitia bres, ariling out of the Corpur calla/um, and afterward do coalefce into one, form Proceiies ( being the tops of the Medulla oblongata) areflvlait} tin-c, ilf‘ all"? you cut themin the middle (where they are fafhied to the hCaypm a cfriuiici 3;; hr about the 'Procefl‘u: lcmiformer, and make a broad Proceis, commonly fiylcd you may plainly difcover great Variety of Streaks, making?i t 61:! progrcns11161 "mks, the Foruix (which doth fupport the chambers of the Brain) and being performed by the All-wife Architeéi: after a triangular Figure, doth difiinguiih the le Ways, upward and downward, forward and bac war large Cavity of the Brain into three partitions 5 whence arife the three Ventricles, of which the two firf't are the principal, and the third onlya ""100 0f thciei in " fine ' S Irmtyz: ' of the Corp)" ' ' Dr.» Willis, giveth a good defcription lines. words; Ne quit dubitet quit: rflzc ling, whit" ditéiiixs [we] (1217"?! f": "I; minim fuerint pro Spirittmm Animalium e corpora Callofi) 1-72 Met M Eu: 0) {Mg} £313: "my; ., ,-. the twoothen \ , The Firii and Second Ventricle pafs down fomewhat fieep about the 3an and approaching one another, make a. kind of Trench, upon which the Farnix pafleth after the Figure ofan Arch, and divideth the chambers of the Brain One from another, and fui'taineth the fair Fabrick of the Brain, confii'ting 0f diverfe loofe pendulous Proceifes, and left the weak (ides {hould fall one"? on another, whereby the Various parts of this fluid Compage might quit the" natural Pofitions, and Hart from each other in over-viol ent motions 0f the Head; Therefore for the better fecurity of this noble firuéture, its feveral l'roceffes are not only fafined to the Medulla oblongam, and Cerebellum, by th‘ Interpoiition of the @i4 Matter, and its feveral Produaions and Fibres, biltalfo y. the mediation of this medullary Procefs,commonl y called the Famixuvhi fh being extended from the fore to the hinder part of the Brain, preferveth it In its due Figure and Situatior . It is broad in its hinder region, and determines in its anterior, as it were in‘ to an Angle; and is fomewhat like a Tripes, Handing upon the fubfiance of the Brain Wltl'i three Legs, two of them bending downward toward the Bag? in pa é" tantra ituredimq; Thefe Streaks of the Corpom Strum: at? lor 12m. ture, as fo many Chanels, for the free egrefs and rcgrefs 0 tie «)1 q 3,, if"? 11111:an iglhc 4! A, I": Tits Olltof the Corpus callufum into the Medulla oblorzgiim 3 And I beenrcuvrenn {rpm}; 533'; corpora Striata robe a texture of Vefsels, and their Streaks to de 0 it 1y; "Hm, Filaments, out of which it may feem probable, that the 'firg ru Limfms' arr;l ;r mm Produétions of the Oifaétory and Ocular Nerves are forme 5‘ an! 21 [62:]; Sm": _ Prepagated to the Medulla oblong/1m, feared near the (orpamllnlrédrdh is farther conceived by Learned Dr. Walter Need/mm, that tr . dip? W)": M are thefirfi Origens of the de/lzz'fpinalm, a fylicm of nunieipiisl 11?. k; "m Filaments, the rudiments of the Vertebral and other Nerves, V\ ‘HC 1 ILCUW their firil: rife and original from the Medirllzzfiirimlisi. , d V. "i ,. I m The Corpom Striam, though they are outwardiy inVeiie IWlti .. \y 1;] iembrane as with a fine Vail, yet they are rendred more tieauttioui \Vlll iiii: with a variegated fubfiance, compofcd of White, firealted \yith Blae , w 1%}givea murual foil, as {0 many contrary Colours, {porting Liemfe vcs as r. ferent Rays, illufttating each other, If) M The! |