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Show 2 000 7/98 ‘Bmin (f $177k. ' 355m __,i uh fl WEN tition inter-ceding the Two Hamifpheres 5 each of thefe White Membrane are beautified with variety ofltreaks, {beaming like Rays, from the Cil‘cnm; fcrencc to the lower Angle, and are concentred about the infertions of the Medullary Procefl'es,which link the Two Provinces together, and being 0pm" ACavitymaY ed with a Knife, a Cavity may be difcerned in each Hemilphsere, feared rm. Sailfish. der the {Leaky Membranes, which difchargc themfelves into one cornmorl . "mm" g Channel, leading into the 'Infmzdilmlum inzothclnfunp _ album" The greateil: part oftheir Brains confifieth ( as I apprehend) in a cortical iiiilgrniiigai fubflance, appearing to my Eye upon a near fearch, of a Cineritious colour iiiiiiiniiiifiiusi' and the Medulla oblongata, and the appendant Oval Procefses, being of; White colour, make butafmall portion of the Brain, ifs. regard be had to the Cineritious part, of which it is principally made up. Tlté Bra?" 0F The Cineritious and White fubftance of the Brain7 are framed of nu. lilllli is full . . . ofGlobules. merous finall Globules, and are nothing but contextures made up Ofvarious Veffels, Arteries, Veins, and nervous Fibrils ( interfperfed with alotpulpy fubfiance) which being cut in the opening of the Brain, [ plainly perceived aftera fhort time, the inward Receffes of it to be freely bedeWed with a liiiéiiiflihc Crifiralline Liquor, which I think to be the Succm izemofm, difiilling out of hx'ai‘iofBird=~ the wounded Fibrils of the Brain. TheVrrirriAnd the Hemifpha'res being cut crofsways, we may eafrly difcover Two $3,332,;de fmall Cavities ( which are inflead of the Ventricles) feared in each Hemifphatre, near the furface of the upper Region; but in greater and more per- feé‘t Animals, they are placed more toward the Bafe of the Brain, not far from the upper part of the Medal/a oblongata, Whofe Origens are the Corpomflriam, lodged in the anterior part of their Cavities. The Four u- Birds are furnilhed with Four Sinus. The Firlt being the long Sim, run- gmflgm neth all along from the anterior to the hinder part. of the Brain, and is not fo deep in proportion, as is found in other more perfec't Animals: from which it dilfereth, as being del'titute of the Falcifotme Procefs, by whofe mediation in other greater Animals, they are divided, as by a Wall, from each Book III. " 7799 fBrriin of 731M}, acct Jr-m the ferous Recrements of the Brain are difcharged into the Chink, as by a COXEL ‘mofl Duct, into the Infundibtdnm. . And it may feem very probable, that thefe large Proniinencies are fubll-itu- Tl" ted, in llsead of the Corpwr cal/(Jain, deficient in Birdsw which have not only prot'uberancies appendant‘ to the Tides of the Medal/ii uh/ongata, but (leads the ProcCHES of the Brain, relating to various kinds of Birds. if U i The Blood-veffels (belonging to the Brain of Birds) are To final], that ‘Ihcmoguh they hold little Or no proportion with thofe of other Animals; and their maps, Trunks of Veins and Arteries (climbing up through peculiar Perforations Within the Skull, without any divarications into the Plexm Keri/firmer) do "creep up near the Glanduliz pituitaria, and afcend the Brain in a direét courfe, difptnfing fmall and fruitful Branches, both to the Surface, and inward Rea belles of the Brain 3 which in Birds, is bedeWed with {mail drops of vital Liquor, and the Brain of other Animals is more freely irrigated with greater (beams. The Brain of a Coofe much refembleth that of a Bullard, and is compel-ed alga-5,3, olFour Procelfes (appearing in the upper part of the Brain) Two of which ademréopéo are feared in each Mediety. ‘‘ The outWard Proceffe's are very large and long, beginning in finall points, + "t and ending in blunt Cones. , . The inward Procefses are much fmaller then the other,an‘d areplaced about 1» if, the middle of the long Siam, and are adorned with a kind of Oval Figure. The Two Provinces of the Brain being parted a good fpace toward the Bafe, may be difcerned a number of fmall Globules, drelsed' with various {herpes and flies,and feem to refemble a number of Clands,which I c0nceive,to' bcfo many fyltems of Vefsels, made up of Arteries, Veins, and nervous Fibrils. other. I V Near the Safe of theBrain, is feated On each fide, an Oval Protr'rinency The lateral Sims are {hort Channels, taking their rife where the Butt lifenyix parteth the Ccrebmm from the Cerebellnm. And the Fourth Sim" is feated fomewat lov‘ver in Birds then in other Ani- fomewhat refembling in Figure the Natiforme Procefses of at Humane Brain; and atelike in colour and fubftance to the Medulla dblo'ngata', to which they F 1 m are appendant as its Procef‘ses. £332,313;nt mals, a little below the Glenda/a pinealu, where this hollow and round Pro~ cefs islet down upon the Crura of the Medalla oblongata, where it is immediately divided into Two branches, which climb up into a Cavity, {63th in the hinder part of the Head, between the (treaky Membrane and the H6mifphatres. 3:233:35? There is not only a great difparity in the Brain, but alfo in the Medul/aolitlltfifr‘dl"; languid of Birds, from‘ other more perfea: Animals 3 for near the place (where ""5"" the optick Nerves borrow their Origen ) Two eminent Protuberancesdo accrefce to either Tide of the Mcclulla oblrmgzzta, and are greater prowlfl' onably, then thofe of Men or Brutes; To that they may feem a Second Bram, contributing aid to the other 3 And ( as I conceive) thefe large Procellcs 9f the Mcclulla oblongam, are endued witha Cortical fubl'tance, in which ‘5 feared a finallWhite Mednlla in the infide, fo that not only the Brain, bf" Tichmi the ProceITes are alfo furnifhed with Two Chambers or Ventriclesz' And 1" ii‘gsrifiiigg" the middle 0f the Medullaty Trunk ( where the Two Prominences are 3P- Siféifhfihf pendant to both fides ) is feared a Filfure, leading to the Inflndibulumi 1' Birds. the Ventricles, and the Mammillary Procefles have their Apertures, by Whlfil' t C 2 are beautified alfo with feveral Procelfes lodged in the upper Region of the hi3": "W. Brain,which I {hall endeavour to illullrate by manifold initances,in delcribing '1}; rru'sr TheBrain of a Swan is compofed of Six Procefses, the Two anterior .1. are + Uadomed with a kind of Oval Figure. The Polterior Procefses + are endued With a femi-circular lhape, and have 'f H. their points below, joyned to each fide of the Cerebellu‘m'. ‘ . The Interior Procefses are alfo Two in number, of a Pyramidal Figure, and i, , ,_ iOYn in their Apices, or points above, to the Oval Frocefses, and do' terminate in their Bafes below to the points of the femi¥c1rculan . . In the middle of the Brain, is feared a Falciforme Procels, running all 'r M + "V along from the Anterior to the Poftetior part of the Cerebellum 1* . The olfactory Nerves + feem to‘ take their rife under the Second part of + ff, Procefles, and pafling on the fides of the orbicular Proceifes, do afterward encircle the 0..- Spongiofimz, and terminate into many Filaments + ( the. 01r- ., g g. ngf Smelling) about the Pcrforazions, placed not far from the rnrdd c + is. °f the Beak +.The |
