A manual of obstetrics . ord), the remains of the umbilicalvesicle (at the distal extremity), the whole being surroundedby a varying amount of transparent gelatinous substanceknown as Whartons jelly or gelatin (which protects theimportant funic structures from injurious pressure), and anouter sheath or covering of amnion. In length the cord nor-mally measures about 50 cm. ( in.); it is from ^ toi^^ cm. ( to in.) in thickness. The vesselsare coiled from right to left, the arteries being external and surrounding the veins; hencetheir pulsation—the funic pulse—can readily
A manual of obstetrics . ord), the remains of the umbilicalvesicle (at the distal extremity), the whole being surroundedby a varying amount of transparent gelatinous substanceknown as Whartons jelly or gelatin (which protects theimportant funic structures from injurious pressure), and anouter sheath or covering of amnion. In length the cord nor-mally measures about 50 cm. ( in.); it is from ^ toi^^ cm. ( to in.) in thickness. The vesselsare coiled from right to left, the arteries being external and surrounding the veins; hencetheir pulsation—the funic pulse—can readily be detected. Thereare generally about ten or twelveof such twists. Frequently dis-tinct knots are found in the cord,which, however, do not as a ruleinterfere with the vitality of thechild. The placental implanta-tion of the cord, while most fre-quently median, maybe marginal,when the interesting conditionknown as battledore placenta(Fig. 31) results. Function of theCord.—The funis is the medium of communication be-. Fir,. 31.—Battledore placenta, oval(Auvard). THE PHYSIOLOGY OF PREGNANCY. 59 tvveen the mother and the fetus, conveying nourishmentfrom the mother to the child and excrementitious matterfrom the fetus to the placenta. Its function is, therefore,duplex. IV. THE PHYSIOLOGY OF Fetal Physiology. During the rapid development of the embryo its vitalfunctions have been assumed one by one, until it practicallycarries on an existence very similar to that of the individualex 7itero, but with notable modifications dependent upon itspeculiar environment. Fetal Nutrition.—Pre-eminent among these changes areto be noted the various methods by which the requisitenourishment is obtained during the successive stages ofgestation. It is impossible in a manual of the presentdimensions to dwell largely upon the interesting changesobserved in fetal alimentation and assimilation. A mereoutline must be sufficient to portray the successive stagesin fetal nourishment fr
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
