OCR Text |
Show 724 Of the Ventrirler of the Heart. Book II, which are three in number ( encompafling the Orifice of the great Artery, Book ll. ' +1.". r. :. of which the greatef't is feated in the middle fa 3‘;ng a; m, The ufe ofthefe fine Valves is to hinder the recourfe ofBlood out ofthe Orr. Scnli'um fice of the/Zorro into the Cavity of the left Ventricle,which may be clearly pro- CHAP. X13231]??? ved by the firuflure of the Valves, which being Concave bodies (feared in the XVIII. :‘hi'iiii‘gof entrance ofthe great Artery) are receptive of the Blood entertained into the Aorta, and moving toward the left Ventricle 5 So that Blood being detained 0f the Motion of the Heart. in thefe Valves, as fo many Receptacles, doth impede its motion backward to- ward the left Chamber of the Heart, and at the fame moment the Cavityof the Aorta being {traightned by many Circular Fibres, doth impel the Blood more and more forward toward the afcendent and defcendent Trunk of the Aorta, to promote the Circulation of the Purple Liquor into the feveral Apartiments of the Body. , T He Heart is the 1110?: noble piece of Houfliold-f'tuff, belonging to the T1,: gm ;, middle Apartiment, as it is a rate Machine of Motion (ordained imiu‘,‘ "5 by Nature to make good the Circulation of Blood, the great Prefervarive of Life;) whereupon it may juftly claim to it felf a Prerogative of being the When the Blood is received out of the left Ventricle into the Cavity of the Aorta, Nature hath provided Semilunary Valves affixed to the mouth of the great Artery) which do detain fome parts of the Blood beaten back The'ul‘tofthc by the Pulfation of the Arteries in their Cavities, as f0 many Membranous chief Mufclc of the whole Body as it is in perpetual motion, and thereupon hath molt [trong Carnous Fibres, confidering its final] bulk, So that its Flelh is very folid, firm, and uniform, tinged with a bright Red, and iggfiégfg‘lii Cells befet uith divers Semicircular and right Fibres, which do Contract its Prifmatick Columns are f0 ftrongly conjoyned that they cannot be eafily Eg‘fh'fsfijfi themfelves and narrow the hollownefs of the Semicircular Valves, and help fevered from their Membranes and numerous Tendinous Fibres ; And above ZunaryVaka- to impel the recoiling Blood forward into the common Trunk of the great all, the flelhy Fibres of the Heart are fo linked together, in each Ventricle, Artery, and afterward into the greater and finaller Arterial Branches, to give Life and Heat to all regions of the Body. that they will hardly admit any feparation. And moreover, the Fibres of this rare Engine of Motion, being as it were Thcflzihro do fo many minute Mufcles, have a different difpofition and configuration from iliilri;l:aalldl, thofe of other Mufcles, as they do not run in parallel, but more irregular E1233?" lines, as variouflyintcrfeéting each other fometimes in Obtufe, and other times in right Angles, and make their progrefs in various pofitions, axial. right, obli rue, tranfverfe, and fpiral. The Walls belonging to the Chambers of the Heart, are framed of di- The Wallm.‘ vers ranks of Carnous Fibres (as fo many Machines of Motion) feared one 531,535? above another, which are not only affixed to each other by theinterpofition gfggffkhf of ftrong Membranes or Ligaments 5 but are alfo firmly, and mutually tied by the mediation of flelhy Fibres. This curious Fabrick of the Heart is contrived with Wonderful Artifice, fpeaking theinfinite Wifdom of the Grand Architect; and under the Membrane immediately encircling the Heart, and from its Bafe, and from the Tcndinous Circular Orifices ( in which the chz Cue/a, and the Pulmonary Vein do Terminate) and from the Origens of the Aorta, and Pulmonary Artery, is propagated a rank of flelhy Fibres, which obferve a kind of Thcfirflra_nk equidifltance from each other, and palling in right [lines toward the Cone, giefifamnrylfiieil where they being varioufly interwoven, are reflected toward the inward ""3"!" Walls of the Ventricles: Under this outward row, are feared other more inward ranks of Helhy Fibres, running in oblique and fpiralpoftures, which tending toward the Cone, do bend backward before they arrive its point, and decuffate each other with various Plexes, and afterward do pafs inward in oblique and fpiral wreaths, (being in conjunction with many ranks ) toward the Bafe of the Heart, and do partly make the inward Columns of the Ventricles, to which the Ligament- of the Tricufpidal and Mitral Valves are afiixed j. and themoft inward ranks of thefe firong Helhy Fibres do integrate the Walls of the right and left Chambers of the Heart. Their inward flelhy Fibres are large, like fo many Trunks where they are Thain..." implanted into the Tendon about the right Auricle near the B rfe of the Heart, gg‘zlyffiflfi',‘ and afterward grow lefs and lefs, as they branch themi'elves in oblique and fpiral pofitions toward the Cone. 2/23/21! The |