File:The practice of obstetrics, designed for the use of students and practitioners of medicine (1910) (14589952427).jpg

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Identifier: practiceofobstet00edga (find matches)
Title: The practice of obstetrics, designed for the use of students and practitioners of medicine
Year: 1910 (1910s)
Authors: Edgar, J. Clifton (James Clifton), 1859-1939
Subjects: Obstetrics
Publisher: 3rd ed., rev
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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short time before death.Their causation is not known. Bowel Excretion.—The bowels are normally inactive in intrauterine life,although in pathological conditions—e. g., apoplexy, coiled cord, compressedcord, etc.—there may be a discharge of meconium. This should be a danger-signal when occurring in labor, unless there is a breech presentation. The Fetal Circulation.—As stated in the section on nutrition, the first signsof the blood and blood-vessels in the embryo are the blood islands in the um-bilical vesicle. The heart in reptiles, birds, and mammals, so far as has beensufficiently determined, has been found to develop as two independent tubesin the visceral layer of the splanchnopleure of the neck region. As the twovisceral layers fold over the ventral side of the embryo and fuse, the doubleheart also fuses to form a single tubular heart. The separation into auriclesand ventricles of a right and a left heart is due to the growth of valves and par- 80 PHYSIOLOGICAL PREGNANCY.
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Fig. ii6.—The Fetal Circulation, ao, Aorta; a.pu, pulmonary artery; au, umbilicalartery; da, ductus arteriosus; dv, ductus venosus; int, intestine; vci and vcs, inferiorand superior vena cava; vh, hepatic vein; vp, vena portae; v.pu, pulmonary vein; vu,umbilical vein.—(From Kollmann.) NUTRITION OF THE OVUM, EMBRYO, AND FETUS. 81 titions in this single tubular heart. From the cephalic end of the primitivetubular heart extend two primitive aortas, and from the caudal or venous endextend the two vitelline veins. All of the subsequently developed arteriesand veins are likewise in pairs except the posterior cava (inferior vena cava).The adult condition of the vascular system is attained by two processes: viz.,suppression and fusion. The suppressions and fusions are shown in part inFigs. 73 and 74. Advancing from the primitive embryonic condition, the vesselsof the allantois and placental circulation soon cause the development of amore complicated system, in which the heart and liver pl

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  • bookid:practiceofobstet00edga
  • bookyear:1910
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Edgar__J__Clifton__James_Clifton___1859_1939
  • booksubject:Obstetrics
  • bookpublisher:3rd_ed___rev
  • bookcontributor:Columbia_University_Libraries
  • booksponsor:Open_Knowledge_Commons
  • bookleafnumber:93
  • bookcollection:medicalheritagelibrary
  • bookcollection:ColumbiaUniversityLibraries
  • bookcollection:americana
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InfoField
29 July 2014


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