OCR Text |
Show 172 Of tbc' Of ANGEIOLOGY» HE A D. 173 ter the Brain too impetuoufly, and for the Veins to unite upon, that they two Anterior Ventricles, between the Foramz'm and the Gerda/lam, is called the third l'mtrz'r/e. 'l‘he CEREBELLUM is feated under the fecond Procefs of the dura Mister. When this is divided lengthwife the fourth Ventricle appears, whole Extremity is called Calamm Srri/ztorim. The two medullary Bo- may enter the Sinufles in fewer and garner Branches. dies at the Bafis of the Carrie/ah»: are called Pgdz¢;;;,y/j. The PIA MATER is an exceeding fine Membrane inveil-ing the Brain even between its 1,9535, arm/155m», and F014;. lt ferves to contain the, Brain, and {upport its Blow-vell‘els, which run here in great Numbers; for the Arm-Err to divide thcmfelves upon, that the blood may not en~ The [\RACHNOIDES, another Coat of the Brain, i~t fituated between the two former, and is like a Spider's \Veb In the upper Part of tire Brain it adheres to the Pia Mam lo Clolely, that it cannot be {epam'cd from it without Laceration in the lower Part, about the C5", -, it is very conspicuous, tho' fonte doubt, and others deny i:s lr‘xiilericci The CEREBRUM is fl.:1tl)21rt ofthe llrain which poffellita all the up. per and fore Part of th : Ciao-slum. The Mann .A OBLONCATA firlt appears in two Bodies from the anterior Part of the poiterior Lobes of the {larch-m" called Cmm M651"; is céz'oxgxmr. The Union of thele between the Ceredra‘m and Certéefz'um is called Ifl/flmm; and immediately beyond this is an Eminence named .15 flaw/m it. For the Sari/lame and what remains, 353 Pa,.ch. lt is {eparated from the (fumble/"2:; by the {econd l'rocels of the Byrd Neg/er. its upper tide is divided into four Lohcs, two anterior and tutolaoyu‘w'z'or, which lal't are by muchtltc larnei'l. The lurUNDIBcLUM is placed at the Meeting of thc {our jult mentioned Lobes. Th 5 teem; to Lie aZymp/lmz‘z'c Cam], which runs {rcni'li Of ANGEIOLOGY. Ventricles of the Lrain to the Glam/11192 Piluimrz‘a, which {omc \llll a n alg/crh "1‘6ka41 from its Uf‘e, being {uppofed to traniinit the {uperr 11:1- NC" OLOCY is that Part of Anatomy which treats of the B/oodqrrj 'r,whetl1er /]r1‘eri€: or Veins. The flrrerz‘er are Vefl‘els, which receive the Blood from the Heart, and diftribute it into all Parts of the dant ‘Q .rofities from the Vet-tricles into the internal jugulars, by means Early ; and the Vein: thofe that carry back the Blood from all Parts to OinlC {phenoidal liefez'vatories, and the Sinufles at the Bottom ofth: the lleart. The Arteries have two Motions, which the Veins have not. in one they are dilated, which is called the Diafla/e ; in the other they Ski ll. This. Gland is tested in the Sal/z: Tura‘ra Immediately brhihd the [Ii/112.117? 'zmz appear two {mall Bodies named daze affine Frontier/rainy pair: @917: are contracted, which is termed the Liv/210A}. hm. "l he (forum's C LI I SUM is {621th between the two liemiliphet . the Brain lower rh: n the Circumvolutions. It is White, of :1 menuritn‘ Subhance, and i‘ called a callous l'Tody becaui‘e its Loniiilencc is a ll.tle firmer than that oftbe reft of the Brain. The Vtx'rrtlcws, calied the fuperior, anterior, or lateral, are N Cavities in the Subitance of the Brain ; they generally occupy 1E1." whole Extent of the Hemifpheres of the Brain. They are tented uti- der the Caz-pm Cal/aim, and are divided into right and lelt by a th‘yfl‘rl Membrane, named Srptzmz Lzzcz'dzmz, which is extended betwecn the Cafe Cable/1'17" and the Farlrix. ‘ The l'ortmx is a medullary Body, beg, hing from the fore l‘fl'fl: thefe Ventricles with two {mall moot», which loon unite, and running towards the back Parts called Cz-ura I‘m-mm, In the liafis ofthele two Ventricles are {our Frcniinenccs. the I"? anterior are called, from their inner 'l'e .ture, Carport: Sir/rm '5 Oft/Je ARTERIES. The ArtrcRIns are only two in the Whole Body, that is, the Pkb/Mmy and the Alarm, 0r flrtei'z'i'z magm, from whence all the reft proceed as L'mntlw. Their figure is (chiral, for their Diameter continually de- crcsles, unlefs about the Extremities, where they become .ylfmlrz'ml, and are changed {ometimes into reticular P/mz‘flr, Paint}, {7}. And at length end in \"eins and lymphatic \l'ell‘eis. They are to fine at lal‘: thutt‘he," cannot be dill'nguifhed by the naked Eye, and therefore Re(ourle has been had to line coloured injections lhe Aort'rn proceeds with a fingle Trunk from the left Ventricle of the Heart, and at its Beginning rclleé'ts back two Branches called the mar/m m, Which are dillributed into the Subttance of the Heart and it\ Auzicles. The 149F111 thence proceeds at little obliquely to the rig"; from whence it returns backward to the left, forming a Semicir‘ two are called Ylva/amz' Nerq‘rnu'mz Optsm rm. Jeyond thefe 9 more Procefl‘es called Nates, and under them, nearer the Cum, called Tries Above the Alert: is lituazed the (Jim-d ' , upon the Hamlumz' Kara/arm Offirar;z»;, the Priwzzs (TZ‘crsm/v, "znch €13?" do lifts of a Number of Bloc'l-vcflels, Glands, and Lynn heedutts. 9" 6 three Branches of the {upetior Aloft/l the one is call *d the right A . In? Carotid. l‘i‘OITi the and the .7577, {I. n"lac-.71 Hm! tulle/avian , and the . other t Cairn/2' , . onthird - the: a r: ltJl's-l‘ proceeds the the lame Under thelieginning of the fun/ix is a {mall tilole, Called f? 4 and Ran/its; Foruiris, or [Mr ad fix/irira'iz'mikzpz; and under the i1 of the Fm-m'x one called Forum!" ' fro/fin", which is covered . _ Valve, named M6.','Ilv'alza, or Ph/m‘u/a Mfr/or; And the Space "We" From the upper Part of this, called twe Alarm .»]/fmdg:z;, mite lhiee CCUfiderable Branches. And the Tum/e continued fr ,m the 5621:: 15(Billed he A'orla Def" 71f'mi, which del‘cends~ thro ‘gh the "Thorax and ‘i'f'la'm"! WWards the O; Sac/"um. it is larger in Women than in Men. (U ' l ~ i" ‘ L lie bei,ci.i\riAx Akt'ElLiES go oil‘ a:molt tranw: rely under the i ~ i,\\het1ce . . Name, and terminate . their on the u; ger Edge oi5 the,_ ftl‘ t are then called Aim/law. _ t t , . t . t Hub, and Lach waveform): in lib P.w |