. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 76 ANIMAL PHYSIOLOGY. the jUacenial sac by Duval, who has recently described this pro- cess. Villi, or tubular vascular outgrowths, spring from the lining of this sac and serve to convey the absorbed and prob- ably altered albumen to the embryo, in which process of vas- cular transport o
. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 76 ANIMAL PHYSIOLOGY. the jUacenial sac by Duval, who has recently described this pro- cess. Villi, or tubular vascular outgrowths, spring from the lining of this sac and serve to convey the absorbed and prob- ably altered albumen to the embryo, in which process of vas- cular transport of nourishment the yelk-sac, that also abounds in blood-vessels as well as the allantois, takes part. The physiological import of the various structures above described will be considered more fully later. At this point a compari- son of the formation of the corresponding parts in mammals will be undertaken. The Fcetal (Embryonic) Membranes of Mammals. The differences between the development of the egg mem- branes of mammals and birds are chiefly such as result from. v rS ). r -•.t. -am,' ''\ -4a,. -^y U Vs Via. 88. Flu. 84. Fio. 89.—Diagrammatio looKitudlnal aeotion of oOaperm of rabbit at an advanced Rtase of pregnancy (KOUiker, after Bischoff). a, amnion; al, allantolH with its blood-veaseli; e, embryo; da, yeUc^sac: ed, ed', ed", nypoblaatic epithelium of the yelk-sac and its stalk (umbilical vcMicle and cord): /d, vascular mesoblastic membrane of the umbilical cord and vesicle; p, placental villi formed by the allantois and subasonal membrane ; r, space filled with fluid between the amnion, the allantois, and the yelk-sac ; tt, sinus terminolis (marginal vltelUoe blood-vessel); u, urachus, or stalk of the allantois. Fio. 81.—Diagrammatic dorsal view of an embryo rabbit with its membranes at the stage of nine sonutee (Haddon, after Van Beneden and Julin). ai, allantois, showing from behind the tail fold of the embryo; am. anterior border of tr
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1880, bookyear1889
