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Show Book 111. Of the Pia Mater; Comtem wjbrimz am/zium ipji innitemium‘, and at once covereth and fog. C H A P. , . , porteth the great variety of Sanguiduéis lodged in it. And this Great Author afligneth a further ule of this chorce Membrane, XXXII. ‘ -\ ' ""-'" ‘s'm ',‘i', ‘M' " "Hf, w'uvas ii mrmygfiw nun-u 5::nyon 71. )9 roast?" 7.6.4711: ,u .m ummvniwv n "771', {,mgéavmy #J 0f the Pia Mater. The {i nation (.1 thi I'iA 11mm The Womb \eflcl of ll is nix. 17'..;!,F.i gg, {Ti 4‘. F. i. 11]. Hit firuur \eil lsolthc 111 $111.7. H E Pia Malt-r is feated immediately under the CHI/fa Mem'mc. £3. ring it with its Convex-Surfice,and the Brain with its ConcaveJi-cpl-e. fenting it in its orbicular Figure, and being every where contiguous to it,encii,_ cleth it with its tender embraces, andA it being a molt thin , Membrane ( isadorned with various divarications oi Blood-veliels ) 'l~ infinuating it felfin. to the deep Interliices of the Brain (to conferre its folit fluid fubftancq7 a, with Swarhs) is extended to the Ventricles, and is beautified with numerou; plexes of Veliels deltending from the Cmfliz Mi/iiizx, leli the finall capinm Veins and Arteries lhonld be broken in their long progrefs into the inigrii medics oftlie Brain, they do lodge themlclves \\ ithin the feveral Filluresof it ClOIlK‘LlWil'l] this delicate Membrane,as in ft) many fafe Repolitories 5 This cu.7 riouscovering is garnilhed with feveral bubbles, is filled with ferous Liquor, Mantegna; ru.‘ min-z, Qme mrcla fit Figure cjm rotunda é): Spbwricd plant: cfi‘iu'my, paytibm nimirnm ipfim fupcrioribm procedentibzw, (5* ad larem circumfluemibma The Brain being ofa fluid difpofition, when left to its own freedom and being void of Conduct, lofeth its former Model, is depreffed above, and iivelleth in the middle and outward parts, and quitteth its orbicular Figure, in which it emulated a kind of Inhnity , and then the‘nob'le Funétions of the intellectual. and fenfitive Faculties are at a Hand, being amazed at this lirarige confufion: Wherefore the lupream Architect hath well provided for this delicate {truéture ofthe Brain, by enwrapping it within the thick and thinner Vel'ts ofthe Dun: and rPia Mater 5 and above all,immured it with . in the firong Wall of the Skull. Another ufe may be given of the fPia Mmyzx, that it invefieth all the deep involutions of the Brain, and having, though a fine, yet folid confiftence, confineth the volatil Animal Spirits ( owing their Birth to the exterior parts impregnated with Air( in Alan, 3 Calfe, Lamb, and the like7 and are lodg. as a Fond, at once to convey and fuf'tain their Veins and Arteries, and net- vous Fibres, with their fruitful propagations, to impart vital Liquor and ani- mal Juyce, to give Life, Senfe, and Nourifhment to it, and to export fuperfluous Blood, thence reconveyed by the Jngulars to the defcendent Trunk of firly uniteth the tops ofits wreathed Partitions, that it rendreih its other. wife plain Figure, orbiculiir. And this thin Membrane is fo clofely affixed to the Brain by minute Fibres, that it cannot be parted from it, to difcovct the Cam. the rare dirarications of Vellels, enameling the furfaec oftlie Brain, unlefs a take their rife and progrefs in the Brain, as in other regions of the Body, the 'Z/dfarll/fl folio/u flipizm, a (err/"i (‘077jllgi0 (/iworfiimz [walitirn (7 flexuofll ejifiill' tcifliliiz lumim'i Ive/u ll/N‘ilfil [rim mm'd (unfpicimmir, aliler convulefl‘mti tei'elzro, Mun/Maui: litre (It/10m) llt'C/,'D'r1li[li0ri[/IM rt'ti/iiitlilis ah'igahz, 77021 [inc [acerdfiniJ mam it" Clltl/lllfi ' ‘ And in the Veins and Arteries lodged in the Membranes of the Brain , fomewhat is worthy of our remark, as well as admiration, that they do not The Blood- vefl'cls have not their rife progrefs, Veins and Arteries affociate themfelves in the mufcular parts, both in the and as in Other Trunk and Limbs 3 but the veffels of the Brain begin their courfe fromthe parts ofthe " oppofite fide, and do accofi: the other Vefl'els. The carotide Arteries climb BJd)'. from the Bafe ofthe Skull, and creeping through the Membranes, fend upward a multiplicity of Branches, with which the venous Sangindué‘ts derived from the Sinus, and gliding downward, do meet with the rifing Arteries; and upon this account, the Arteries and Veins do wonderfully anfwer one ano- ther in their different Divarications; while the greater Branches of thoArte- rics encounter the finaller Veins, and the greater Trunks of Veins the fmaller Arteries; 1 bus I have given a rough draught of the Veins and Arteries, (whofe tender Branches, ( like thofe of the Ivy about the Barky Tree) twine themelrcs about the "Pin Mir/tr, to ftipport their Weaker Fabrick; and how the fPiJ A'lcniux is interwoven by them, mutually fnpporrino each other ; and in what manner the various Sanguiduc‘ts do overfpread thgfiirface of the Cc. rclzrum and Carmel/11211 in their Interfeétions, Sin/it, and Cavities, with their numerous olillpring‘ \VlHCli are rarely propagated into the medullary' Subliance: leoneeiw it now my Duty to give you in fome manner 9‘ [hort \iew oi the [lfes and Offices of the Pin Mater, which Great 04"" in'ol'teleganily deferibetli in his Eighth Book, and Eighth Chapter 339 "f" Warn/("1‘ ‘H ":1" : ii )'~~7i o' 7. {xiiv‘wtifu '/\V '21}!th Lil/(*4 Jt‘ @‘ozé:n, '5) fig}; 7é7v1<§nrJrJL7W ‘,i'/:;1;' 'ih: Second we oi the I'm Mam. of the Brain) Within their proper Cells and Stations. Thelal‘t, and not the meant-Ii ufe of this Membrane, is, that it ferveth ed in the Vellels running in the Furrows ofthe Miranda's) and the Airy,fpiiitiioiis parts oftlie Blood, exalting it felf toward the furface of the Pia Mater, And this fine coat doth nor only line the deep Intei‘fiices of the Brain, butlo relaxation be made of the Fibrils, in a Hydrocephalus. ll! Irmm Mcwbrrthe [m- mfcio quot limfliim/cr rercbri mzfi‘aéi‘m iiIfi/i/mtia, (9» tum txiler mmHUI], (fix arlrriiirirm riIIJ/It/i ptr intima rcrc/Iri prizelriiliafcrpmtcr (brim imm{tjnmh Cal-wriiz/i/‘(meri [fit/ratcp/Ja/o mpcr [ii/iorxinlir, fern: Corona? inflar aperui, "(I [tritium tcrt/Iri ire/iiiritui/ar : (5‘ Fibril/is, qirarum ope temii thllrmm [trcl/ro ai‘éiifliziic allllfé/I/Iii' fern/ii i/lurz/ic relaxant, int/e Membrmm [Mt mmmvf; The Figi re of the PM Ma» ((7. 2», vii: Ten/iii Mcm'nx terrbrlim fiubi/t/nr, legit (7 tdiiqrmm winter!" Learned Dr. Willis hath made a curious obfervation of the veflels of the Brain, that the carotide Arteries of one fide are inofculated vr ith the Arteries of the other; and the vertebral Arteries on each fide, both unite and efpoufe eachother, and oreinofculated into the hinder carotidoBi-anches, and Frrfi receive a confederacy with each other, before they admit a near union With the vertebral, and the frequent inofculations of the carotideArtcries in mofl: Animals, are tranfaéted about the lower region of the Skull, under the Dnin fomc m M‘W'm 3 And this Anaflomofl: is Celebrated in a diverfe manner, it is in the various plexes of Arteries in the Km mirabzlz tranfmitted from one fide to the other, and in others, ( as it is very remarkable in a Horfe.) between the great Trunks of the foporal Arteries, a large Arterial Duet is framed, carrying Blood from one region to the other. . "1 autem wariarmn inter fe inofculationum ratio may: elutefat , ea 790mine latex purpurem' efim'jfro Cordir tba'lam‘a per elatiorem name trio/curt: 0‘ u rr Ti‘i'llch The Arteries ofone ride of the Brain, do inarculatc "ith thrift of the other. |