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Show L- fig, Of Mufclnr Motion. Chap. XV_ Clitip. X V I. 100 fibril/,3, ‘1'" Artie commas Tendinem confiitmmt, latim jiméia', mrm'm can. fliruunt. _ Armani; But lconceive, with the leave of this Learned Author, that a Tendon likzatiord, refembleth a Cord, not made up of loofe Flefh, but folid Tendinous Fibres, al iiof 3:133:11: which again may be refolved into many Ligamentous, and fonie Nervous Hum. Particles ', and though it be diiiicult to difcover how thefe fibres do efporife each other, in a near union, yet I humbly conceive, it may be evmced by Reafon: That a Tendon is interwoven with Nervous Fibrils, as it appear- etli being Convulfed (in Piiiiéiures and Wounds)‘ to which a‘Tendon could be no ways liable, if it did wholly confili of ligamentous Filaments, parts altogether infenfible. . . ' . . . "mime": Again, If according to this Ingenious Author 5 Opinion, the flefhy Fibres ochndinom do conflitutc the 'lendon, why do they not appear upon the crofs Cut. 3213:9223er ting it, when they differfo much, both in Colour and Confifience, from xii‘mgiifi‘m :;:,"f(,,‘i‘;,l"‘jw V'hcmd'and W' 'rreTnjndi- the Tendinous Fibres, the flefhy being Red and foft, and the Tendinous hard and White 9 And ( as far as I can apprehend) the right, oblique, and traufvcrfe Fibres of the Stomach, and the right and orbicular of the Inte{lines (which give them their Various Motions) cannot be truly termed flefliy ( as FtIIOPiMJ‘ will have it) when thefe Fibres are of a Nervous or Tendiuous nature, being of a white Colour; and Learned and Worthy Doaor (room hath well obferved in his Anatomical Leélures, at C/Jimrgeom- Hall, that the Fibrils of moving Membranes are not red. 80 that the Mufcular Motion, may be truly attributed to the Nervous Fibres ( as in Conjunéiion with the Ligamentous) through which the fulltle Animal Particles are communicated from the Brain, and Spinal Marrow, to the Tendinous Filaments, compofing the main body in both Extreamitics of the Mufcles, fixed to fome folid part. Thefe Tendinous Fibres are very firong and firm, able to lift up the hea- The Biceps ofthe Ciibir,and the Pfoas ofthe Thigh 3 and the feveral Origcns M of the Deltoeides, the middle of the Clavicle, the Acromion, and the Spinifoi'm proccfs of the Scapula, are {0 many Hypomoclia, or Centers of, Motion, upon which the Arm is raifed. The Biceps hath a double Origination, derived from the Acetabulum, or l Sinus of the Seapula, and the Coracoeidal procefs, the two Fulciments upon which the Cuv bit is cltvawhich the Cubit is lifted up. red. And the Pfoas hath a double Origination, from the two lower Vertebres of the Back, and the three upper of the Loins, the immoveablc terms of Motion, upon which the Thigh is lifted up. To {peak more clearly, no Artificial lnftrument more fuiteth the natu- A motion of a l'ullcy, is ralmechanick motion ofa Mufcle, then a Pulley, in which the Diameter fomewl Arlik‘.‘ of a little Circle fupplying the place of a Lever, i‘efieth upon a "T 'pomo. t cmouotiof a Mul'cie clion; and the weight is tied to aTendon, as to a Cord, placed to the tail of a Mufcle: It is thus effected, fo that while the termination of the hiuf‘. dc giveth way to the Contrafiion, made by the Tendinous Fibres (called Carnous, as they are hued with Red) the weight appendant re "5' of the Mufcle, is confequently moVed according to the Diinenlioris, as it wet: of different Levers, and of new Diameters, continually fucceeding one another; and as a greater and greater Contraélion is made of the Mufeular Fibres, the weight of our Limbs is more and more lifted up. C H A P. XVI. 0/ HM manner of Maw/4r Motion. iifdliuiliiirdiid vy Weight of the Limbs; which aéiion requiring great fircngth and foli- $333135", ffl‘fifc‘ubgg iiiiifccliiiiio'iiii; chiefly afiign- dity, cannot principallybe given to flefliy, as loofe and flabby .parts, Auxiliaries only to the Tendinous Fibres, and are their foft Repofitories; and bemg accretious of Blood, adhering to the outward furfaces of the Veffels, tinging them Red, do fill up their Interfaces, whereby they prefetve them "mm" from interfering one againfi another in Motion. Which that it may be daily celebrated, it is a requifite condition to have lefs Dimenfions, during the time of its Contraéiion. a Hypomoclion or Center, upon which, as an immoveable Bafe, the moveable part mul‘t raft, elfe no motion can be performed, according to Ari/fuller Pofition, in his Book De Animalz'um Incefl‘u: 54v 0' rm; Wham 'i‘xv ms uvw'mi im'. mm, as irr' a; grim, weir am: Si nullum omnina man's pmbeat Fzrmamnmm iii/Jilfirper z'pfum "IN/ere poflz‘t. For whatfoever is moved , is founded in fomewhat immoveable, as a Center of its Motion ( which if Mufcular) whether it be a Bone or Cartilage (to which one Extreamity of the Mufcle is faf'tned ) it mufi be quiefeent, elfe if it [hould give Way, the one EXtreamity of the Mufcle, could not be Contraéted toward the other, unlefs fixed to fomewhat immoveable, asaCenter of Motion; which is plainly vifible in all Mufcular Motion relating to the Limbs. Thefe natural Organs of Motion, hold fome Analogie with Artificial Mae chines, and feem to refemble Levers, by whofe contrivance we more cafily lift up heavy Bodies; and after this manner the Mufcles do feem to celebrate their aétions, as may be infianced in the Deltoeides, the flexor of the Arm. The its Contraéiion, which he aflirmeth in the Thirty Seventh Pace of hi; Book, entituled Elementarum Myologite Specimen, in this Propofitioniz In omit Mufrula, dum contra/Jititr, tumor cmztingit : A qwclling happenetli in the Mufcle According to Ariflmlt, all motion is $31,153,qu 3392:3160;th hurt-uni moii-iitriiiih. 213;? $2332? hi'stm- HAVing Difcourfed of the Struélute of Mufcles, and their Motion, it may not be altogether improper to Treat of the Manner of it, and give a farther Illuflzration of its nature t whether a Mufcle hath greater or Learned Ste/10 is of an Opinion, that a Mufcle acquireth a greater bulk in When it is Coritraéied. Which the worthy Author lecondeth with this far- ther Fxplication: Cum Tumor ni/Jil fit, m‘ji mafia mm, we! [iv/am in carpore Dimenfioner, idem efl craflz‘tiem Mttft‘ltli augeri, at Tumorem in ll'I/tflii/o £011tiflgcre: When a Tumour is nothing but one or more Dimenfions encreafed In a Body, it is the fame thing for the thicknefs of the Mufcle to be enlargcd, as the Tumour of the Mufcle to arife. And further, This curious Author doth aifert, that the Hi ht and lati- tude of a Mufcle Contraéled, is equal to a Mufcle not Cotitraéied : Alli/11:10 llfufculi contraéii efl mqimlir altitudini Mufmli norz contracrii. And his Reafon he giveth is this , Becaufe the Paralclogtams refiing upon the fame Bares 0f the Mufcle, are of the fame hight. Which I cannot apprthend (which may be afcribed to my meaner Conception, and not to the Nature of the thing) in reference to the Patalelograms, or Squares of unequal fid:s, reE e letting 5mm conccia veth the Muf- Lle to acquire greater I‘imenfion, in motion, |
