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Show L11]. 0f the Dura Menyux. Book III. 0f the Duta Menynxii » 937.1 x I no proper Integrals, cutting into the fubl'tance of the Dum Many/2x, being not the proper Matter of which it is compounded, but do only expanstc themfelves upon, or between the Coats of the 171m: Mater, Where they fport themfelves in greater or lefs Divarications; whence I may plainlyin. ferre, that this Membrane is not intimately ftarnedVof the common Vt‘llels Trunks commence near the Bafe of the Brain, and are branched inui more iiliiiiwdi 2:321:23? out of the fubltance of the Brain,but alfo originally produced out ot the more and more minute Ramulets, which are more numerous in their Capillaries WWW], 3:51,",‘13‘ . , ~ as they more and more approach toward each fide of the Falciform Procel‘s) F, Thefe nervous and membranous Fibrils are molt minute Filaments finely fpun, and paflinglong-u‘ays the whole length of the Membrane, item the nivxrhmous fore-part to the hinder, make the Warp, and other Filaments running ctolg; mmmis' ways, and interfeéting thefe right Fibres from one lide to the other, maybe calledrhe Woof; fo that thofe numerous fmall Filaments of the VVarp‘and Woof do frequently decuflhte each other, and being clofe firuck doleem to be one entire fubl'tance, which is indeed a contexture, made up of innumerable minute Fibres, clofe pUt together by a molt skilful hand. Thrlim Al- The Lima Alba being a thick Membrane, framed in like manner of di- fsistiirioiiiarlc vers tendinous Fibres, mutually interfeéiing each other, and lb clolEly uni33:35,:‘3333'. ted, that they appear to be one uniform fubltance. b" A Learned Phyfician told me, that inaBody Diffcé‘ted at Chyrurgcons: Hall, the Linea Alba was wanting, and fupplied only with a multitude of Filaments, crofling each other in acute Angles : Wheteupon in Analogy, we may eafily be drawn into belief, that Membranes are curious Contextutcr, formed out of numerous membranous, and nervous Threads, mutually intcrfeéting each other, and f0 nearly eonjoyned, that their clolings one with another cannot ealily be difcerned, except when Nature hath not well an L- .-.L_ .4._I.;;‘ complilhed the Texture of thefe Fibres, as you have heard in the late in- "A. in the Membrane, cut and turned up, and violently firetched out. And thefe n, r minute Hefny Fibres run clean counter to the courfe of the Arteries whofe "'fé‘iligizi of Arteries and Veins, but doth challenge to it lelf a more peculiar Com. Tiit‘n'ervcus PRng which I do apprehend to be made up'of rm innumerable company of hleriiarziiiplc- membranous and nervous Fibrils, not only difpenfed from the Nerves, illurng tough part of the feminal Liquor. fiance of ill united tendinous Filaments, feen in a Body in the Chyrurgeons Theater 5 and to parallel this humane Inl'tance in a more imperfeét Animal, Ihave feen (in the Head of a Fifh, being Diffeéted) fome part of the Brain 3332"",05 imperfec‘ily covered with a number of minute Filaments, f0 ill put together, with a ml company of very4 eafily difcovet the Interfiices ofthe ill _ interwoven fmallFtI could that , . , inlnuteFiM- ores of the Dun: Maler. "mm" this Hypothefis, wherein the Mrzteria Sub/ham of this Membrane is aflErtcd to be a Syf'reme of well-compofed nervous, right, and tranfverfe Filaments: And that a farther confirmation may be given of where they very frequently wheel, and then affociate; and afte‘ra finall 1"Page) part again, making various Arches after the manner of Network 5 Amon the minure Capillaries are interfperfed many fmall Glands, feated on both Manymrnute fidesof the Third Sinw, near the Trunks of thefe catnous Fibm, Whofe Glandsare branches divide themfelves in the fubltance of the Dam Mater, contrary to {'2}??ng the progrefs of the Arteries; and are ( as [conceive ) the true caufe of the "‘2 Sign" motion of this Membrane in Sneezing, which is performed by the brisk Con. mm. traction of thefe carnous Fibres, expelling fome {harp vapours, or thin ferous, Thc Carnoiis or more grofs vifcid Recrements, which give a trouble Fll‘fi to the Dim; Mea iiiifsliriiix nynx, invelting the ventricles of the Brain 5 whereupon it endeavoureth to 1'"Cf," fr free it felf from an importunate Gael}, by making a great comprellion of £5332"? u the Cortex, and more inward Receffes of the Brain, thereby drawing other parts ofthe Body in to confent with it, Which can hardly be effected by mi- nute nervous Fibrils, not able to produce fuch Ptrong agitations and con- cuflions of the Brain, as are made in Sneezing, unlefs they be afiiIied by carnous Fibres, which are much fewer in number then the nervous, the great ingredients of the Materia Sub/tram of the Coats of the Brain Wherefore thefe nervous Fibres being fo confiderable, in reference to the Matter, out of Which the firm: and 'Pia Mater are compounded ; I {hall en»deavour to give a fhort account of the nature of them, upon which the acti‘ $1 0: Extenfion and Relaxation, and ufes of the coats of the Brain are oun e . Thefe nervous Fibres are minute, round, oblong Bodies, of a gluy tenaci- Tgfgndgflfir, ous difpoiition, and thereupon can eafily maintain their fine Compage with iicnjous Firm each other, and being of a tough tenfile nature, are apt to be lengthened and "I" varioufly interfeéting each other, elfe it cannot be well conceived, howa fltt'ngthened; and being of a pliable temper, can admit various Flexures Without laceration, becaufe thefe Fibres are of great Perength, every lingle one bflng C'Ompounded of many Filaments fo curioufly clapped together, in ihiinimiiii great extenfion of the 'Dum Mater can be made long-ways, except it be 19- clofely CODJOyned, by the interpolition of melt thin Membranes, that they leieial pow med of right Fibres; nor broad-ways, except it be compofed of tranfvtth, item to make up one entire Body. l;,‘;";l:§lin both of which being capable of Extenlion, do preferve the 73am Mater from J :‘yigf'y‘gf‘ Laceration; elle if it were wholly one entire fubltance, one part would "mm A..'_‘.-‘l Thefe catnous Fibres take their rife near the Fal'ciform Freed} where h 1 their Trunks do arife, and running crofs-ways, do infinuate themfelires into hatching the fubftance Of this Membrane, and are divaricated into fmaller and fmaller Sim branches, in the manner of a Tree, as they are carried in the Membrane ot'ci;§53§"r' nearer and nearer toward the Safe of the Brain, which I plainly perceived I-rbnls. flart from another in violent motions, and fuffer a great Violation inth‘v' whole, reudring the Dim: Menynx ufelels, and expofe the Cortex t0 9!?" innundations of Blood ; Whereupon it being highly comprelfed, would m And thefi: Fibres being round, cannot be fo clofely united in all parts, but Th: Pill-"til Ihty muft have fome very fmall empty fpaces, which are interlined with an 37:31:"; Anlmal Liquor, Which being fomewhat confolida-ted, covereth the intetWo~ ven Fibres, crofling each other, elfe they would be eafily dilizerned, Were they not faced, and lined abcvve and below with nervous Liquor, filling up terrept the entrance of the Animal Liquor, into the roots of the nervous Fl‘ the chinks of the Fibres, rendring their Com age plain, and even a and it brils ', thence caufing an immediate Apoplexy. yvere to be wilhed for, and by all means p0 ible to be attempted, that by ' And further, it may be fomewhat probable (as I conceive ) that the?!" 2:53)? {figflfiffsfi "‘1 M30"? Is not only made up of nervous, but alfo of fome carnous Fihtf-‘S too, which are very fmall, running between the two Coats, and is IIIfl akin in this to the Membranes of the Quiet, Ventricle, and IntellineS- crapmg, 0‘ frequent wafhing the Coats of the Brain, the Fibres might be {Md f"3m the eoncreted intercurrent Liquor ; that the curious contexture "the Fibres might be difcovered, which Would afFord‘ a very pleafant pro- fie FObehold‘ Natures fine Architecture, {peaking the great contrivanee of t at AILW‘fea and moi} Glorious Mind Thofii I 9 |
