A System of midwifery : including the diseases of pregnancy and the puerperal state . ccompanying representation of the product of an abortion aboutthe twenty-fifth to the twenty-eighth day, shows the embryo and itsmembranes partly dissected, and magnified about seven times and ahair. The Chorion, which has been opened in its whole extent, isrecognized by its villi externally, and the numerous bloodvessels on itsinternal surface. Above, and to the left, is seen the umbilical vesicle,with the branches of the oinphalo-mesenteric vessels coursing upon lies, as has already been shown, betwee
A System of midwifery : including the diseases of pregnancy and the puerperal state . ccompanying representation of the product of an abortion aboutthe twenty-fifth to the twenty-eighth day, shows the embryo and itsmembranes partly dissected, and magnified about seven times and ahair. The Chorion, which has been opened in its whole extent, isrecognized by its villi externally, and the numerous bloodvessels on itsinternal surface. Above, and to the left, is seen the umbilical vesicle,with the branches of the oinphalo-mesenteric vessels coursing upon lies, as has already been shown, between the chorion and the amnion,and its long narrow pedicle bearing the vessels is seen to pass into theumbilical cord, and, finally, to terminate at the summit of the single V,,.] STRUCTURE OF THE EMBRYO. 121 curve which marks the commencement of the intestinal right omphalo-mesenteric artery is close below the intestinal canal,and included in the rudimentary mesentery. The left omphalomesen-teric vein (v) is passing towards where the stomach is beginning to Fio. Ovum opened, ;md embryo partly die develop, to discharge itself into the common trunk of the umbilicalveins. This is the commencing vena portae. The amnion ( m m ) hasbeen freely opened to allow the embryo to escape, the caudal extremitybeing still within its cavity. The manner in which it is reflected toform the sheath of the umbilical cord is very clearly shown. Theumbilical cord is opened in its whole extent to show it- contents, in-cluding the canal of the urachus (pedicle of the allantois), which extends from the caudal extremity of the alimentary canal, closely ac-companied by the umbilical vessels, ami terminates at • in a either side are the umbilical arteries and veins, the arteries spring-ing from the Lower pari of the aorta, ami the veins passing upwards, to unite before entering the liver and mix their contents with the general circulation, at the point of confluence <
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectobstetrics, bookyear1
