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Show Of the manner of Aliyrltir ail/{arrow Chap. X VI. lating to h/lul‘cular Bodies, which are not purely Mathematical, but Phy‘ heal: and mull, according to this great Authors Hypothefis, acquire a great. er thickneis in Contracted Mufcles, in which he Cloth tonfels, .a- Tumour aril‘erh; and therefore a Contraéied Mufcle, according to his Opinion, mull; have larger Dimenfions in height, then a not Contrafied Mufclez . Muticsiio But I humbly crave Pardon of this Mailer of Anatomy, in pomt of my Dilient from him : becaule I humbly conceive , that Mulcles do , , flyiflflltfy Ieii'en thenilel\‘es both in depth and length by Coritraélion, and the rows of 9?'Oii[iil:aiu Camous Fibres, feared one within another,‘carried molt commonly ob. r .Sré'nihmg liqrrcly7 and fometimes in right, and other times in tranf‘verfe, and fpiral iiiinfiiidilihii‘f‘ Lines, do not Swell, when they are contraéied in their feveral Philical Planes :g‘,‘;;:‘g,§7,_ ( which make the body oFa Mufcle) by making the many Paralelograms, grow thinner in their Diinenfions in the Motion of Mufcles, becaufe the Carnous Fibres, when Contracted, do force themfelves inward; and b rendring themfelves Tenfe and Rigid, do {hrink the bodyef the Mufcle: V And this plainly appeareth in the Coat of the Muicle, which before Contraéiion was tight, as being fitted clofe to the furface of the :Mufcle, and af- ter in the Motion of it, the Coat groweth flaccid and limber, and as it were wrinkled. to; their greater Branches, till the Blood paf‘feth through the Trunk of the Own, 313‘3‘2W'f1 into the right Chair-river of the Heart, into which an extraordinary quantity of issliickn, . ‘ . . . A motion of . Blood is lpeedily imported in Violent motion of the, Body, performed by hresxomprcf. quick and {irong contractions of various. Murcia; which making COmptef- {ivfiifisiuoa ons of numerous Sanguiducts, do iminit f0 great a torrent of Blood into the Heart, that it is not able to tiilcliai'ge this Luxuriant Liquor by otdi~ narv Pull-ations, and therefore it doubles and trebles the Vibration, to {aris- fie ihe iinportunity, caiilbd by the over-hafiy motion of Antagonil'r Mufcles $31,133? ( which arethole of the whole Body, in reference to the Heart) thereby dyqrcAnm‘ drawing the l ungs into {trong and violent Motions, that they might re- hudiiiztgrtiii: czive more f equent draughts of Air, and attenuate the Blood, and by Ex~ H‘m‘ piration to protrude it through the Lungs, to free them from a fudden Suffocarion. So that it is very evident, that the MqulCS by the motion of their Car» nous Fibres inward, do {traighten the Cavities of the Vedas, and fqueefe not only the Vital Liquor out of the Arteries and Veins, but the Nervous all'o, out of the Filaments of Nerves; whereupon the body of the MllerlC'S innit grow Iefs upon the protrufion of their fluid parts, and the body of the Ninttle is not only lelTened in greatnefs, but in length too, produced by the corrugation of the Cai'nous Fibres (as learned Doctor Lower doth inof‘t realbnabl y aiTert). mal Fpirits,tlie Ctmiiant refidents in the Nervous Filaments ( conioyned with the Ligamentary ) the great Confiituents oi the CarnousFibres : Theft: com- ated, when one Extreainity is fixed, and the other left at liberty to play; The Mufdc and upon tie contrafiion of the Mufcle, it being fhortned, the moveable Siii‘ciiigiiiiih mon Gnefis are attended with new fupplies ofNeighbouring Emiflaries, freih Animal Spirits (infinuated into the Mufculous Fibres) the more fubtle and fpirituous Particles of the Nervous Liquor, Which do invigorate the 33133:; Nervous Fibres, by giving them more then ordinary Tenfenefs; and by itl‘f'zgn‘j‘33}: drawing them inward, in a more clofe application of one Fibre to ano- imurdther, do leilen the former Dimenfions, affecting the Mufcles before their part doth pull the Limbs to which it is fafined, toward the quiefbent term, Qtrg‘m‘cfit as the Center of M'otion, upon which the motion of the MulEle is fup. "WWW": potted. Having taken the freedom to {peak of the Mechanick parts of the Mufcle: founded in the Tendinous and Carnous Fibres, and the Motion of them in a general Notice; it followeth now in courfe to explain their more par- So that the length of the Mufcle is abbrevi- Conti‘aétion. ticular Motions, how they relate to this and that Mufcle, and how a fingle, 90 that the Mafcles confifiing of a double Tendon, feared in each Extreamity, are accompanied with Carnous Intermedial Fibres, which being . , V ' _ contracted inward, do fliorten the bodies of Mufcles, by bringing both their Extreainities nearer; which being fallned to two different Terms, the one moveable, the other immoveable; the moveable Extreamity upon or fome few Mufiles or more in confetderacy move, and all the reft lie quiet. Iconiefs, the caufes and manner (how this is accomplifhed, is very intricate and perplexed ) are very little underfloor}, as depending upon the ii‘cret and unintelligible operation of the Soul, in the Organiclr parts of the iiiiifiiiiiliny the abbreviation of the Mufcle in contraéiion, mull neceflarily be drawn to- Body, which, how they are aé'red by that more Divine Principle, and how an Immaterial Ellbncc can efpoufe F0 near a union with a Material, as to the other. animate and move it arbitrarily; and how fuch an intimate correrpondence his," ob, WNW}. ward the immoveable Term, as the Center of Motion. Somelearned Men do confign the motion of Mufcles to Inflation, decla- can -be held betu'een two fuch difproportioned Natures, is fo obfcure and mm how ' . . . .« , . IomcMufclt-s ced From the Volatil parts of Nervous Liquor, infpired with Elafiick Particles of Air (inlinuaring theinfelves into Spaces intereeding the Filaments 0i Carnous Fibres) pulling them up, and enlarging the Bulk of the Mufcles. But I liippofe it more reafonable to believe, that the Nervous Fibres are in- profound, that it 15 very difficult, If not impoflible to be fathomed; and rhouia more; how the our ihould at its pleafure, tingle out one or more MufEleS, and iiilgiiiii: I: vigorated only by the fpirituous Elafiick Particles of the Animal Spirits, not blowing upJ but irritating only the tender Filaments; which being of moll acute fenle, do contraét theirilelves toward the inward Receffes of the F'alularmo- Mufcle, and by drawing the Carnons Fibres clofe together, do render its iii? film); body more itifi, and leis, by emptying the Vedels, and the fubfiance of the engage them to Motion, and the tell: of the Mufcles of the whole Body, m" tell unaffeéted. Ingenious Regina hath ventured on a new Projeé‘r, as I conceive, to falve the Phamomena of this Motion by afligning it to two feveral Valves, feated within the Nerves, which being opened by the determination of the Will, give the Animal Spirits an inlet into particular Mufcles; and thefe Valves being (but up, give a check to the influence of the Spirits, and Po figifaj‘fi; Mufcle of its fluid parts; which [imagine is thus efi'eéied: In the Contra- the Soul {hould not act in emiliion of Animal Spirits, illuing from the Brain, rlic ‘Pirituous fiion of a Mufcle, the Carnous parts havino a recourfe inward and Spinal Marrow, but by opening and {hurting thefe \ alves. and Elaflitk 3 do conipré‘ls 3' {insurers the Vellels, and their Spaces palling between them, and do firlt briskly fi,;§_§‘,°""‘" fqueele the Vellels, impelling the iburce of Blood out of the Arteries into the lnterftices of the Veflels, and from thence into the Capillary Veins, an their i Of the manner of [Wins/4r motion, Mufcles being inl‘trumcntsoi Voluntary Motion, do play in feveral Politions, according to the pleafiire of the Will, and are acted partly by Ani- m Wm EfiiignciX-m: ti i i am isrii_,risn, iiigiiiiiiiliiif :i‘t‘fi'fii'fif ‘ """Ll'nt l ‘ r l Chap. X V I. And {0 our Divine part (hould play the part of an Organifl', in opening and [hurting fuch Valves, placed within the Organ, procuring fuch Wind , conti- |
