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Show 0f the Chine. ,. ,_ :«,-;:/pmzfi2a Book III, The whole Syiteme of lpinal Vertebers may be called a line, Book Ill. 0f the (hint. 106 5' Syizm/i: from any Cornpreliion, Which elfe might have been produced ions! Chain, made up ofthe two extrcam parts of the upper and lower, of the Neck, and the 0; Sacrum, and of two middle parts of the Back and Loins. Every part is compofed ofmany links, the upper is that ofttheck, confil'ting of Seven Vertebers, refembling fo many links, fo firmly joyncd to each other by the interpofition offlrong ligaments, that their union ishard. ly to be violated. The firll link of this vertebral Chain is named ArlM, {gay led from fupporting the Globe of the Head, and is {trongly articulated with itY by two fmall heads, propagated from the lower Region or the I): occipim, and received into two Simu, engraven on either lide of that eminent Cavit ', by the violent motion or the Dentiform Proceis, had it not been covered by ‘ a {otter Ligament. This Dentiform Proeefs in a Child new born, feemeth rather to be an Ap. endix then a Procefs, becaufe an lnterfiice appeareth between the Proeel}. and the Second Verteber; and its produétiott being of an after date, fecmeth to be clapt upon the Verteber, and to remain fome time as it were fepamte from it, which Iconceive is occalloned after this Manner: The Dentifonn Procefs being firfl: Cartilagiuous, is lafl: of all oilified near the Verteber, whereupon a Cartilaginous Seam intercedeth the Two Bones of the Verteber made to entertain the Dentiform Procefs; and thefe Two Shim of the 141/," are ver well fitted to the heads of the 0601'th 5 whereupon they are [0 fim]. ly fixe in their proper Cavities by ligaments, that they cannot Pratt up mo. and Proeei's, which being afterward concreted into Bone, fillcth up the Hiarur, and perfeélly uniteth the Verteber to the Proceli, making up one abiolute Bone. tions of the Head, which are performed forward in Flexion on the hill Var, teber of the Neck,by the Mufculi mafiaia'ei, which being long thick Mufcles (ariiing partly out of the top of the Sternon, and partly out of the clavicle) do afcend obliquely by the Neck, and are infisrted into the ?roccfl‘m Mm. miformcr, which being contrafied, do draw the Head forward, pulling the The‘I‘em'orl Chin toward the upper part of the StEI'non; fo that in this pollure, (ac‘iiil‘zm‘n cording to Galen) we ive our alfent ammendo, and out dillcnt rcmimdo, by fifjfifgl'g‘li' withdrawing the Head ad ward, celebrated in extenfion, by the antagonill $35533)? Mufcles to the Mafioidez, rl - Splem'i, Camplexi, (R2625 Majorca, 6va- and lnfcrti- re; 5 the firl'c taking their rue in a double Origcn ( partly from theFivc ‘7"5' Spines of the lower Vertebers of the Neck, and f0 many tops of the upper Vertebers of the Back) do terminate with oblique Fibres into the Orripui. The other Tenfors ofthe Head, called Complexi, which being as(l conceive) One and the firfi ufe of the Dentiforrfie Proeefs, is to be a center ofMo‘ Dcnrit'ut Tl‘CWW'Wl" m: tion, on which the full: Verteber being pliant, freel playeth backward and Khakis: forward; whence in my opinion, the Firll may be tru y called éwm‘v‘s though suitabili- divers Learned Anatomifls have alligned this Title to the Second Vertebcr, which may be better denominated Axis, in reference to its Procefs, about which, as being immoveble, the firfl: Verteber ( firmly united to the Ot‘ripur by {bong Ligaments) doth varioufly fport it felf in oblique motions, performed by the Mufmli obliqui Superiorer (7‘ Inferior", which taking their rife from the upper Vertebers of the Neck, are carried with an oblique contft‘, and inferted into the [ides of the Occiput, fo that the Heads of the lVlufcles being fixed to the Second Verttber (as to an wpamorlion, or part immovea~ ble) The Right oblique Superior and Inferior Mufcles (being feared in an obi lique pollute, and terminating in the Right lide of the 0criput,) when con- jhf'Vmbr iiiliihfiié" offhcflluigu. $321523; many Mufcles united into one , do borrow their Origens from Four tranli‘erfe ":6th mull necelTarily pull the Face toward the Right Shoulder, and in Proeeiles of the upper Spondyles of the Back, and from the acute Procelles of the Seventh Verteber of the Neck, and are lirongly inferred from the middle of the Occiput into the Mammiformc "Proriflu , The near Major-er, are (hot: acontrary manner, the Left oblique Mufcles ( being antagonifis to the former) terminating in the Left fide of the Occiput by gently Contracting themElves, do reduce the Face from the Right Shoulder to its middle pollurc; and flelhy Mufclcs arifing out of the Spine of the Second Verteber,and the Minort: out of Tuberrzi/um ofthe firft verteber,are both inferred in the middle ofthe 0t- ‘ the lame Mufcles being more firongly contracted, do draw the Face further toward the Left Shoulder; which various oblique motions of the Head, fame ciput; fo that the Spleniifflefli Majom, (9v Minarer,(bmpltxi (beginning in the Vertebets of the Neck and Back, and terminating into the Om‘put) do in Call Rotation, though not ['0 properly, becaufe the motion of a Wheele .15 their Contraflion bend the Head backward, by drawing the Output toWard culat Motion, and cannot be truly afiigned to the Head, becaufe every crr- ‘5'"? 3.. a not made obliquely to and fro, like the Head, but is carried rollnd in a cir- iii: 2:122: Thefi'uuaol‘ the Neck. 3;?" V"‘ In the lou'er Region of the firl't Verteber, are ingraven Two lhallow Simu, which are endued with an orbicular circumference, Which doth not run do is compofed of Three hundred fixty Degrees; therefore whatfoeyer Mott. 35;? "M" on is performed cirCUlarly, mull run through all thefe degrees, pafling round the Shoulders on both lides', but the various oblique motions of the perfectly equal, as being enlarged in its politerior Region, be yondthe round convex of a Circle into thefe Sinus, incrulled withaCartilage, the TWO, little Heads ( fpronting our of the upper part of the Second Verteber ol the Neck) are received : [n the middle between thefe Two Heads, outofthe fuperior Region of the Second Verteber of the Neck , fpringeth up an emit mm high and folid Procefs, whence the Second Verteber was called by 0‘" great Mailer Hypomzter, meagre, fomewhat refembling a Dogs Tooth; and HEM, fucceflively acted, can make ( as Iconceive) at molt not above no degrees, Which is but one Third part of the Circle ; and therefore truly can. not deferve the Title of Rotation, or Circular Motion, but only different oblique Motions, fuccefiively performed about the Dentiform Procefs, by Virtue ofthe oblique Superior and Inferior Mufcles of the Neck: And the "‘3'! l"motions of the Head in Flexion and Extenlion, are exerted upon by Galen, meals, a Izmir pilzei, imagine: In the body of the firl't Verteber: "e" the back fide of the great For-amen (conveying the Medulla Spinalk ) Na- the til Verteber of the Neck, Extenlion being celebrated by the Contra~ fiion of the Spit/Iii, (iomplexi, Refit" Major", (9: Mnorer, and Flexron by the Joynt-motion of both the Mafloidei; but the lateral motion of the Head 335332;, tum hathengraven a deep Simu, fit to give reception to the large DentifOfm is not made upon the Firll or Second Verteber of the Neck, but by the mu. Procefs, whole Surface is fomewhat rough, out of which arifeth a Ligament tymg to the Occiput this remarkable Procefs, which is furrounded with a 9" lid round ligament, refembling the Figure of a Nerve, contrived with 34m" rable Artifice by the molt wife Difpofer of all things, to fecnre the Met/"Ill: Spinal tualconcurrence of all the Vertebers, not by both the Mafioidez, as in Flexion, but by a fingle Mafloidcm, which is derived from the top of the Ster- Thc'llmllthe "0"» and inferred into the Right Proreflm Mammiformer, which by its Con- mfhgiagc maion pulleth the Head laterally towards the Right fide of the Neck) 331d by "Tau" ,. e 11,5171 |