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Show Book I. Part lV. C H A P. Book I. Part IV. 0f the Placenta Uterina. 631 The rPlate/1m is endued with a Convex furface ( as it faceth the Womb that itmay the better comply with the Concave fur-face of the um", and be lodged clofe in its bofom to receive Blood and warmth from it, and is rendred uneven by many Ptotuberancies , by which it is affixed ( as X X VI I. This integument of the F0.7m" is adorned with a Concave furface as it con- to difcourfe the Confines, the various Integuments, with which the Foam: $535520? is encircled in the Womb, which being opened, the Placenta ‘Utcrim pre- fineth on the Convex of the Chorion, that they may be repofed near to each other, to take up the lefs room, and more eafily tranfmit nourilliiuent from the rPlacenta through the Chorion to the Farm. The (Placenta hath a peculiar fubftance which is loofe and foft in fomc parts and in other refpcé‘ts Fibrous, as made up of innumerable Filaments and Fi- vmm. bres, interwoven with an infinite number of branches of Velltls fporting Aving Treated of the Formation of the Farm and of the order of Delineation of its parts one after another, my Task at this time is fenteth it felf to the Eye of the Spectator, and taketh its origen from the Albuminous or Serous parts of the Blood percolated in firfi the fubflance of the themfelves through the whole compage of the @ldcenta, whofe Partzicljyma fomewhat refemfembleth concreted Blood adhering to the outward furface lefs in all Membranes) and afterward def'tilleth through its Pores into the of the Veffels, and is not much unlike the loofe "Parent/gym of the i iver, ( which may be taken away from the fibrous part by frequent wafhings or by gentle fcraping with a Knife) only it is more vifcid and hath fomewhat of the Albuminous nature relating to the white of Eggs, or to the Concreted Liquor belonging to the @arcnchyma of the Glands, which is lefs friable firft rudiment of the After-burden, which is afterward filled up with a foft red fubftance, by degrees growing more folid, as furnifhed with Veffels derived from the Womb (and at length frame the Navil.) Whereupon it acquireth the nature and fubftance of a flefliy Bowel, minifferial to the Farm: in reference to Nutrition. it‘ifnfl'llfifrif: ' The Warsaw moft times is fingle, and fometimcs double, which I plainly finglc and difcerned in the Afterrburden of my firft Twms, wherein the peculiar After- The Placenta is furnifhed with many lVIinute Glands, appendant to the extremities of the Sanguidufis, and are divers colleétive bodies or \rte- Liquor, to prepare a fit Aliment for the Ftttm, during its abode in the Womb , and do refemble the Glands of the Breaf't both in fubllzance near their time of birth. cema: faith this worthy Author in the 36. Chap. de 'Platenm : thflififlamia and life. Learned Dr. Wharton afligneth a double glandulous fubl'tance to the (Plaglandulofa alum}: genemm eff; etenim zip/z; placenta duplexefl ; Altai-a ejm medie- $522330 After-burden, and though the After-burden feemeth to be parted by a Line tM pertinet ad ‘Uttmm : Alien; all Cborz'ozz : Arq; [are medietatex inter fe apte Lyuggg'nf‘ik" pafling through it, yet it is truly but one entire fubftance, faith this Judicious Author, by reafon the Umbilical Velicles of the right Fmtm‘ are ttanf- tommittuntur, fen potim inofmlantflr. mo. Angles, which are the holes into which the Tubes do terminate, and HOW fubftances affixed to the Chorion do participate at double nature, the one The Anatomifts have various Sentiments concerning the fituation of the "Placenta, fome affirm it is feared about the forepart, and others about the hinder part of the \Vomb, fome about the left, and others about the right fidc of it a but in truth it encircleth one of the Tubes near one angle of the IFZhZZiE‘f Can/fat 2211'»: ex ianuali fltperficie, m"- ‘Utcrur, which is the Center-of the @lacenta : So that the Womb having tWO burden. and then the (Placenta is placed all round about the right Termination, and more white and glandulous, and the other redder and carnous, as it appear- now and then the left. eth in the numerous Platentulte of Sheep and Coats, whofe upper region is white, and exterior furfaees looking toward the utem are Convex, and their. inward Concave, which receive into their bofom the convex furfaces of This Coat of the Fam" is clothed with Red fomewhat brighter than the rem. Spleen, and darker than the Liver, and feldom With a pale colour. :hléclilaci‘ixlof . The 'Platmia, in reference to its whole Circumference, is adorned with‘a Circular figure, and bath various dimenfions of greatnefs and thicknefs in reference to the different magnitude of the Farm, and is f0 fmall, that it fcarce appeareth in its fii‘ft origen, and by degrees is more and more enlarged till it arriveth its utmoft perfeétion, wherein it obtaineth a Foot in breadth, and is endued with the tliickncfs of three Fingers in the middle, and with lefs in the Circumference. The Dr. Whartm attributcth a double glarinlous l‘ubllanee to the Plum start. mirum, ale/2011's c6» protuberantiix fibi mutua refpomlentibm; in: ut ale/calm uni- u: medietatia protubcramiam alterim in fe extipiat, (9v undig; ampleé'iimr. The glandulous fubf'tance of it is of two kinds, by reafon it is double, of which one half belongeth to the Womb, and the other to the Chorion; and thefe tw0 halfs are conjoyned to each other, are rather inofculated, by reafon the Placenm is made of an uneven furface, raid. of Cavities and Protuberancies, anfwering each other 5 fo that the whole of one half doth entertain the protu- berance of the other, every way encircling it. This difpofition of Nature is more evident in Bruits, whofe many Oval tn: the Vellels of the Navil are branched into the right region of the After- The Glan'ls of the 1'];term. ries, Veins, and Nerves, as fo many Colatories of the Viral and Nervous Fiflure pafling between them, but my Twins born a year after, had but one Afterburden, which was one entire fubf'tance (without any Seam) which grew very thin as diitended by the enlarged dimenfions of the two Foam: mitted into the left fide of the @lacctzttt, and f0 vice wcrfa from the left F064 The fiihflancc or the F14: than that of Blood. ""lydwbk' burdens belonging to each Child were parted from each other by a Scam or Learned Dr. "idler Need/mm affirmed] , That Twins have always but one The Plant" harh .1 (Iontavc furtace as it faceth the Citation. (Sill. Chorion, (which is befet with very Minute Glands, which are more or outward furface where the Placenta appeareth in many downy Hairs, the f;‘§,fi‘"fifif" WA! d the Womb. learned Dicmcrbroetk will have it,) to the inward Cavity of the Womb. 0f the Placenta Uterina. Twinshave l he cocwx furface of the Placenta to- the Carnous fubftances ( affixed to the Cliorion,) which is died red by the great quantity of Blood tranfmitted into them by the Umbilical Arteries, which are more numerous in the Carnous fubftances below, than in the Glandulous above, and in truth both thefe above and below ( I humbly conceive) are of a Glandulous fubltance, though of different colours, and the lower part participates the nature of the Glands belonging to the liver and Kidneys, which are red as they are filled with many Ptreams of Purple Liquor. Now The mimerous Planter:zu . rift; nits have . « \rt: critlcntdoir hle fubltaucc than the P11mm of \\'oman. |