| OCR Text |
Show Of rte/Firm". Book II. Book II. 0f Refpimtion. 87.9 ‘- thofe Wheels of the Gulet, Stomach, Intefiines, Arteries, and Mufcles, the greater and flronger engines. of Motion are all contracted by Flefhy Fibers, acted by the Elaitick Particles of Animal Spirits, the more refined of Nervous Li uor. AIXIriflsthe Oeconomy iii the Vital parts, the Heart and Lungs feared in the middle Story of Mans Body, hath akind 0i peculiar Oeconomy finnewhat diHErentfrom that of the other parts of the Body, as the Lungs) a great Lungs. '1 he intercollal Mulclcs. ter dimenfions, whereupon the neighbouring parts give way at the fame moment for its more eafie reception, the Midrifl' contraéteth it {elf by various chief Machine, made up of various Receptacles oFAir, but in point of Time, this great, and other leiler Wheels do celebrate their motions together. At the fame irritant the lntercoltal Mufcles, Arched Ribs, Sternon, Diaphragm, are engaged in various motions, contributing to the main motion of theLungs. The two ranks of Semi-Elliptick Arches of the Ribs, feated in both lides, have two Extremities, the binder are obliquely fallned in a double movable Articulation with Ptrong Ligaments to the Spine ( curioufly Carved with variety of acute, oblique, and tranfvers Proceilcs) as to a firm immovable Column; The anterior grilly Terminations of many of the Bony Arches, are conjoyned in oblique lax Politions to the Sternon (as to a Breafi-plate 3 ,l 80 that thcle extremities of the Ribs may be dilated with the Sternon, annexed to them. -Thefe are called Parallel Bony Semicircles, becaufe they obferve an equal dillance from each other, as interfperfed with the Intercollal Mufcles, being thin oblong quadrangular Bodies, confifiing of a kind of Parallelogramms in Figure. mm... .. .No 4-1 ‘I he d. uhlc row oi l-ihreu 1): {citing the Intcrttilal Multlcs. rence of~ the Brealt to exclude its eflarte reliques in Expiration. When the free fireams of Air run through the larger Channel of the Orbicular Tuniclts, as [o many Channels and_Ci{iernsof All‘.‘ _ . And having taken the little Clock (compoled of many Relpirmg Organs) in pieces, and treated fingly of every Wheel 5 of the Intercoflal Mulcles, and Semicirclesof Ribs, how they are afiixed to the column of the Spine, and Sternon. and of the Circular Diaphragm, and of the Lungs, as the lwillnowfet allthele Wheels together, and endeavour to ihew you the realon and manner of Refpiration, which is a thing of as great Difficulty, as Importance. In the order of Nature the motion of the Lungs is firlt deligned as its The Intercol'tal Miticles, feared between, and affixed to the Ribs in oblique Pofitions, confili of two Ranks, the one External, the other Internal, which are furnilhed with numerous equidiltant Fibres, interfeéting each or ier. The double row of Fibres befetting the Intercol'tal Mufcles, was wifely infiituted by Nature upon this account, to aflift each other at, fometime in a concurrent motion, by reafon two ranks of oblique Fibres Would elfe diftort the Ribs in the motion of the Breall 5 For inflance, Suppofe the Ribs, being parallel with each other in point of Concave Surface, it may feein evident: whenthe oblique Fibres are lhortned, it will diforder the equidiflant pollute of the Ribs, if the different oblique Fibres of feveral Mufcles [hould move the Ribs in various inward and outward Politions at the lame time. . Therefore it is prudently contrived by Nature, that all the Fibres decullating» each other, and affixed to the Margents of the Ribs, fhould jointly produce the fame operation of moving them upward and outward at the fame time. To Thc manner of licfpiratiou. play upon the reception of Air, and another time to contract the circumfea Afpcra Arterizz, into the leiTer Pipes of the Brown-laid and its appendant round parts totter- ned in the motion of the my utmolt endeavours to ihew you all the Inf'rruments of Refpiration mo< \‘ing together, as ferving each other in a great order and decorum, {ometimes enlarging the Perimeter of the Thorax, to give the diilended Lungs a free machine of Motion) are chiefly managed by air-external princ1ple by the fpring of Air, dillending its curious Frame, conlilling of many Cylinders and great VVheelloi Life, to whole motion all other leiler Wheels are aiiillant ; The ftvtral To give a more clear fight of the manner of Breathing, I will improve Tunicles, the fpungy fubi'tanc of the Lungs groweth Iivclled, acquiring grea~ The enlarged dimenfions of theTbamx in lnfpiration. Fibres, and is brought to leis and 1er Arches, till it arrives a kind of Cir-a cular Plain 5 90 that the Stomach, Intellines, and Liver, lately entertained into its arched bofom, in the Thorax, are now deprelled into the IOWell: apartiment, whereby the Perimeter of the middle Story is much lengthened, to give a tree entertainment to the greater dimenlions of the l ungs,anti not only the Midrific hath quitted its Convex Polition toward the Lungsgand Concave toward the szcem of the lowelt Story, but the Ribs at the lame inl'tantlofe fomewhat oitheir Arches too, becaufe they being tied to the Spine (as a fixed Column, the Center of Motion) are pulled upward and outward; by reafon their Articulations are f0 Framed with the Vertebres of the Back, that they may give way to the contraélions of the Intercollal Mufcles, bringing their inward Concave Surfaces to a Plain, thereby making acute Angles, whereupon the Ribs being brought in a Perpendicular toward the Neck, and more horizontally toward the Back, the Perimeter of the Thorax becometh greater in breadth, as a more eaiie allodgment for the tumefied Lungs in Infpifpitation. In Expiration the contracted Abdominal Mufcles force up the Liver, Intel'tines, and Stomach into theboforn of the Midrifl, which is thereby red laxed, as having its Circular Plain reduced to an Arch, and at the lame time the decuflated Fibres of the Intercoftal Mufcles being unbent iri their re-pole, the Ribs are brought downward and inward, 46?" quodam refilz'emlz', ( as hard Bodies) from acute to obtufe Angles, whereby the Perimeter of the Thorax is narrowed at the fame moment in latitude by their arched Ribs, as well as lellened in longitude by the Convex Surface of the Midrifl‘; So that the Lobes of the Lungs are horizontally and perpendicul arly comprefled, and the Membranous Sinus, and numerous Pipes, difcharge the Eff'xte remains of Air (not afTociated with the Blood) into the greater Pipe, the Afpem Arteria, and thence into the Mouth. And I humbly conceive, that the Orbicular Tunicles, and the numerous {mallet and greater Cylinders of Air, are not only emptied by the compref- lion of the Convex Surface of the Midrifl', and the Arches of the Ribs brought to obtufe Angles, but alfo by the motion of the right and circular Flefhy Fi- res, COHtraéting the Cavity of the Membranous Orbs, and various Cylinders; wherebythe Air is fqueefed out of them into the larger receptacle of the Wind-pipe. ln fhort, Infpiration is made by all the Organs moving the fame time, Whlle the Lungs are diflended by the inflationiof Air, the arches of the Ribs are brought from obtufe to more acute Angles, and the Concave Surface of the idr‘ifl‘ to a plain circular Pofition, to give reception to the greater din menlions of the expanded Lungs; In The circumference of the Brezil is narrowed in RC‘, fpiration. Th: Lungs are emptied in Exfpiratioa, |
