OCR Text |
Show 266 0f the Stomach. Part I? And in oppol'itc manner, if the Annular Fibres do commence their Con. tents of it toward its Termination, about which, if thefe right Fibres do begintheir Contractions, and fo aft toward the left Orifice, the Contents of the Stomach are forced in Vomiting toward its Origen, and the Extreamity gion to a Plain, and lift up the liecrement and Alimentary Juice, and prefs of the Gulet. Below thefe rows of right are placed another rank of Oblique Fi. bres in the Concave Surface, Which when they take the rife of their Mo. tions in the Origen of the Stomach, they narrow its Cavity firlt about the left Orifice, and prefs the contents towards the Fyllarm; wherein if the Ob, lique Fibres do firfi act their parts, they throw the Contents toward the left Orifice. them forward toward the right Orifice, till they arrive the Antrum, or Cavity of the 'Pylorm, where by its Fibres, they are forced to the entrance of the trude the Contents of the Stomach toward the Fylomr and Inteftines; this Niotion is aliifted by the right Fibres (feared in the upper region of the furfacc of the inwardCarnous Coat) beginning their motion near the Ori. fice, and thereby Contract the length of the Stomach, and force the Con- So that various rows of Fibres, making different progreffes in the outward Convex and inward concave furface of the Carnous Coat of the Stomach, do every way lelfen its Dimenfions, by their various Motions: The Annular and Oblique Fibres, do feveral ways leffen the Cavity of the Ventriele according to its depth, and the right Fibres (pafling along the top of the Stomach, from one Orifice to the other) being Contracted, do pull the Extrcamities nearer each other, and thereby do {horten the length of the Ventricle; whereupon the various Carnous Fibres contracting according to their different Situations and Pofiures, do every way leffen the hollownefs of the Stomach, and do throw the Contents of it to its feveral Extreamities, according to their various beginnings and terminations of their Motion, in and to the left and right OrifiCt-s of the Stomach. The third Coarot' the S'omach is K: runs. The third Coat is Nervous, made up of numerous Filaments, finely inter- woven with each other, and have feveral progreffes, fomc in length, and others in depth; which being clofely conjoyned, do chiefly integrate the choice Compage, accommodated all?) with Arteries and Veins, whofc Extreamitics are inferred into its lower Surface, inVCfiICd with a Cruft, full of right Filaments, perpendicularly terminating into the Nervous Coat, which it covereth in manner of Velvet, as Doctor Willi:~ exprefieth it; and is befet The fourth t ear I: Glandulous. with numerous Minute Glands, whence this Coat is denominated Glandulpus, and may be called the fourth covering of the Stomach, into whofe iubltance many Nervous Fibrils are implanted, importing a feleét Liquor into it, whole more refined Particles being fevcred in the body of the Glands, are carried by Pores or Minute Ducts, into the Cavity of the Ventricle, and the more recremeutal parts of the Nervous Liquor are received into the Ett‘reamities of the \‘eins,or into the Lymphatduéts ( ifany in the Stomach) and lo tranfmitted into the common Receptacle. The relentiic faculty is pelfornrul by the gentle contra- (iious of dif- f rent Fibres, enclofing the Aliment in the Stomach. Of the Stomach. of it deepways, and a third rank of Fibres making their progrcfs Obliqlieiy in the concave furface of the ficlhy coat of the Ventricle, do contract it ob~ liquely inward. Whereupon the Cavity of the Stomach being narrowed every way in its Dimenlious, by the gentle Contraéiions of various Fibres, doth purfe it felf up to encompafs the Aliment within its foft embraces: dun ring the Concoéiion 5 which being cfibéted,aiid the Alimentary liquor extra&{d, the Forces grow troublefome, and the Fibres feared in the bottom of {1,5 Stomach, contraéiing themfelves, do reduce the Arch of the lower lieu tractions near the left Orifice, and are carried toward the right, they pro- The rightFibiesruuning in length ,tlo pull lnC Lxtieimity of the Stomach to the other, and [thin its length. 1?. 4 Thus having Treated of the various Coats of the Stomach and their feveral Fibres, I Will give a brief account of the retentive and excretory Faculty of the Stomach, performed by the greater or lcfs Contractions of Straight, Oblique, and Circular Fibres. The Retentive Faculty of the Ventricle (ordained by Nature to ellClOre the Aliment in order to Concoétion) is accomplilhed by various Fibrcsi whereof the long do run thelcngth of the oucward Tuniele, ContractingY l5 1 ougways ; and the Subfequent Fibres pafling down the depth of the Con. vex lurface of the Carnous Coat in firaight Lines, do narrow the hollownef: Oi Elma/mum. The Excretory Motion of the Stomach, is more briskly performed in Purging, by Fibres beginning about the left, and moving toward the right Orifice, and by Contraéiing one part after another fucceflively, do leffen more and more the Cavity of the Stomach, and thereby fqueefe the Conents of it from the Origen to its Termination. The Excretory lvlotion in Vomiting, is more {bong then that of Purging, to which the Stomach runncth Counter in this unnatural Motion, performed firli by the Carnous Fibres, violently contraéting in the bottom of the Ventricle, whereby they lift up its Contents with great girks, which are fecondcd with firong Contractions of the various ranks of Circular, Ob- llql. e, and Long Fibres, Rated in the convex and concave furface of the Carnous Coat, which move in an inverted Perilialtick Motion, from the (P/rlarm‘, and bottom to the origen of the Stomach, whereupon it grows narrower and fllCITECl' in its Dimenfions 5 and the Contents are forced from the right to the left Orifice, and thence into the Gulet. And now a Qgefiion may be fiarted, How the Fibres of the outward and Carnous Coat of the ‘ tomach are incited to move, when they are fo remote from the Contents, which make their firfi: Appulfes upon the Fibres of the Nervous Coat, and afterwards draw into confenr, the Carnous and Membranous Fibres, of the fecond and outward covering, whofe great action and ufe are infiituted by Nature, to encompafs the Aliment in the tender bofome of the Stomach, lelfencd in its Dimenfions by the contraétions of various Fibres, in order to the concofiion of Aliment; which being perm Thecxcretory power of the Stomach is acted with the more lirong motion of the Cartoon: Yibres. The exrulfirc motion or the Stomach in Von itmg, is ext-rm byti c more v'olent ofthe Larnous Fibres, then thatot‘ Purging. The Carnocs Fibres are drawn into confent by the appulfl-s ritli made upon the nervous Fibrils. and then upon the Carnous by lympathy, as near to them, formed, the Alimentary Liquor, and the Faces feparated from it, are carried through the Elam/r, and right Orifice of the Ventricle, into the Inte~ ftines. And that the grofler parts of the Meat may not be tranfmitted- till the Alimentary Juice is duly Extrafied, Nature hath molt prudently guarded the left and right Orificcs with Fibres to contraéi them, lcafi the Aliment fhonld be difcharged the confines of the Stomach, before it is duly Concoéted. The left Orifice of the Ventriele, feared in its Origen, hath a flraigh‘t and perpendicular pallage, which is guarded with Carnous and Membra- nous Fibres narrowing its Bore, leal't the Stomach being difgufled after the reception of Aliment, fhould throw it up immediately into the Gulet; and this Orifice is opened in time of chlutition, performed by the Camous Fibres of the Mufculu: Oefiipbagmu, contracting the Cavity of the Color, and thereby forcing the Aliment down to the Origen of the Stomach, whereupon the Fibres, guarding the left Orifice, are relaxed, and the Meat anvil Drink received into the bofome of the Ventricle, Tl The left Grl‘ fit: of the Stomachjnto which the Guletislm" planted. |