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Show Book II. 0f the Amie/er of t/ae Heart. Book II. feared in the termination of the Pulmonary Vein (to which the left Auriclc ‘ is conjoyned) which is more narrow than that of the Termination belonging to the Vcna Cat/a, to which the right is affixed. iificxiigfigyht, nexion, by realon as the right is conioyned to the termination of the lie/2.2 Cam in one tide, and to its Body in the other, fo the left Auricle in the right fide of its Bafe is tied to the fuhlhmce of the Heart near the egrefs of the Pulmonary Artery, and in the ‘L'; Gde of the Bafc of the faid Auricle to the body of the Pulmonary Vein. The Auricles are accommoduu (lcs. macaw". . . , ~"lr Arteries, Veins, and Nerves, of of ",0 Verztritlfl ' of the HM". Aving difcourfed of the outward Walls of the Heart, it may be fit now to lhew you the inward Receffes and Chambers, common- ly called the Ventricles, the one being heated on the right, and the other on the left fide, as the Cif'terns of Vital Liquor, from thence tranfmitted by the one into the Lungs, and by the other into the great Artery, and afterward by fmaller and fmaller Branches, into all parts of the Body. Cavity than the other, and is endued, not with a round, but rather 3. Se- Hem, micirculat Figure, not extending it felf to the Cone. ment 5 And on the other Gde, the right Auricle, where it is concerned with the Venn Cat/a, is guarded with a hard Tendinous Circle, into which the Hefhy Fibres are implanted. Now I Will difcourfe fomewhat of the ufe of the Auricles, and refpite the greatef‘t part till I treat of the Motion of the Heart, and compare the Auricles with the Ventricles; wherein it may be obferved that the Auricles have not the fame Analogy which palleth between the Ventricles, moving together with equal pace, by reafon a greater proportion of Blood ought not to be impelled by the contrafiion of the tight Ventricle into the Pulmonar Artery, than can be received outof the Pulmonary Vein into the left ChamlDCI‘ 0f the Heart 9 So that mm bmh leterns Of the ) i . through the Pulmonary Artery into the filb AW" and ":5 Branches and Ramulets, into allpartsof the 80d ' . The motion 0f the 310°C] being {0 confiant and orderly in the Ventricles, It may be worth our difquifition, why the Amid" do ho: obferve the fame Analogy TWI‘ cad] Other in dimehfiomt WhiCh Nature ordained (as I humbl)' COUCC'VC upon this account) by reafon the current of the Blo°d is more flariighhii/ychf out Of the V8," C4?" into the right Ventricle 5 therefore 1,3,,ng "mm flow [ire thfat the CaVity of the rightAuricle {hould be it is reqUi‘ more enlarged,is as receptiveo alarget proportion of Bloo . . , , d, thence to be in)e&ed into the right Ventricle, .fufliCie nr for its Repletion; by reafon the Blood in Expiration is more fpeedily fqueefed by the preffure of the Lungs out of the Pulmonary Vein mm the lfftVentrich; whereupon the motion of the Blood is morehiohly accelerated, and therefore a lefs Cavity will fuffice in the left Auricler ' D _ The right Chamber of the Heart hath thinner Walls, and a more large iliiiitiigiictor they enter into the body of the Heait, and are derived from the Perl/4314M. Figure, which are IZ-Iiri-i- lodged in theVentricles of the Heart: Thefe intermedial Fibres are carried ' with an oblique courfe, and are inferted into the oppofite Tendons, by realon they being feared in the Bafe of the Heart, are alfo imparted to the Auricles, and upon thefe Tendons the flefhy Fibres do tell as upon 3. Prop, or Fulci- m "can, - which the laft are divaricared ti‘l‘Ollg/l me hibl'tance of thole Mufcles before The Auricles are fur-nifhed with many ranks of flelhy + Fibres, from di~ 25mg": versMufcular Columns, very much refembling thofein :lnif,1:l1'f;i;rthc 4 ‘ The outward Surface of the left, when rendered turgent With Blood, is like the right Auricle in its fmoorh Convex Figure, and the left doth very much refeinble the other in its inward Surface as furnii‘hed with many Furrows and Roughnefles. . . ‘ The 1th AuThe left Auricle allb obferveth much Analogy with the right in its Con- 35:32:; KV II L H A P. . . . This Veiitricle in its tight tide is adorned with aConvex, and its left With a Concave figure. . _ . The Orifice of the Vemz Cat/a tranfmitting Blood into the right Ventricle, Thcmmrfi. is guarded with a Membranous Circle, divided into three Valves looking ‘h'V‘IV‘L inward, commonly called Trim/jade; from their Triangular figure, as fome imagine, though in truth they are not endued With this fhape, but have the appellative of Tritufpider, by reafon each of them hath three Fibres, as {0 many Ligaments, by which they are faflned to the Helhy Columns, re- lating to the Septum of the Heart. , , , Thefe Valves give way to the {tream of Blood, coming out of the Orifice of the Vemz Cat/a into the Cavity of the right Ventricle, and do hang pen; dulous, as fome conceive, in the Contraction of it, to (hut up the termination of the Cam, to intercept the Retrograde motion of the Blood into it. . The Wall of the right Venttiele is much thinner than thatof the left, and $5,353,, narrowed only with a Semicircular Contraétidn according to its Figure , Rim??? whereupon the Furrows of this Ventricle are more lhallow, and the CatnoUs mm, Fibres more final], as being an Appendage of the other more {trong Ventricle‘ And leaf): the right Chamber of the Heart, having a flight enclofure, {hould be overmueh dilltended by great Rivulets of Blood beyond its due tone ‘ So that the Carnous Fibres fliould be f0 far weakned, as nOt to be able to Cbntraé‘t themfelves in order to difcharge the troublefome current of Blood into the Lungs ; Nature hath wifely framed a round Mufcle about its middle Region, proceeding from the Septum Cordir, which is Very co'nf icuousinthe Heart of Bruits, andin that of Man three or four Fibres may bl; difcovered, which fupply the place of this Mufcle found in the Heart of fome other Animals. Before I quit the difcourfe of the right Ventr icle, I it convenient to {peak fomewhat more of the fine Valves feared near defm the Orifice" of the Ca‘Z/d and to confider their Mechanifm ( in which their ufe may be feen.) Thatitheir @qu'll‘eot Columns are rendred Prominent beyond the surface of the infide of the Ventricle, and that fome of thefe Valves are feared in the oppofite fide, and that, the Columns are placed in .a fide oppofite to the Membranes to which they are affixed; as Learned Dr. Lmer, hath obferved. ‘ Yyyyy'yyy The Etch/deli?" 2:33:22 faltncdtdthe firmer;- |
