The practice of obstetrics, designed for the use of students and practitioners of medicine . of communicationbetween the fetal and maternal organisms. It is also called the funis,funicle, or navel string. Origin and development: In the human ovum themesodermic connection of the amnion with the chorion, including the rudi-mentary allantois, is called the abdominal stalk (Figs. 64 and 65). Withthe growth of the body-wall and the extension of the amnion this stalk,together with the stalk of the umbiHcal vesicle, and the blood-vessels whichunite the embryo with the chorion, become invested by a co
The practice of obstetrics, designed for the use of students and practitioners of medicine . of communicationbetween the fetal and maternal organisms. It is also called the funis,funicle, or navel string. Origin and development: In the human ovum themesodermic connection of the amnion with the chorion, including the rudi-mentary allantois, is called the abdominal stalk (Figs. 64 and 65). Withthe growth of the body-wall and the extension of the amnion this stalk,together with the stalk of the umbiHcal vesicle, and the blood-vessels whichunite the embryo with the chorion, become invested by a continuation of thesomatopleure, this whole forming the umbilical cord (Fig. 96). The umbilicalvesicle itself is never included within this cord (Fig. 96), but extends freelybeyond it, and by the fourth week becomes inconspicuous. Structure andvessels: The epithelium of the cord consists not of a single layer but of severallayers of stratified epithelium, continuous at the proximal end with the epi- * For the exact location of the placenta, see Diagnosis of Pregnancy, and Fig. 102.—Human Ovum and EmbryoAT Four Weeks. X 2 and reduced.—{Schultze.) 72 PHYSIOLOGICAL PREGNANCY.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
