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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arise asmere pads of indifferent mesodermic tissue covered by ectoderm. Into themgradually extend outgrowths of the myotomes producing muscles and carryingwith them the vessels and nerves which have already joined them. A partof the mesoderm is condensed in rod-like forms. The connective-tissue cellsare transformed into cartilage in those portions of the rods which are to formthe bones. Where the joints are to be, the condensed connective tissue persists,forming amphi-arthrodial joints. The true synovial joints are developed laterby a solution of the connective tissue between the ends of the cartilages. Thehands are formed gradually from mere pads and the fingers are at first webbed.In the main outlines human differentiation of organs is like that of the rabbit,as shown by the fact that the selected illustrations are mostly human; but inone important particular the distinctively human development differs fromthat of the rabbit, the body being outlined from outlying portions at a later
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Figs. 91 and 92.—Fetal Skulls of the Ninth and Tenth Months of Gestation(Two-thirds Natural Size).—(Authors collection.) stage relatively than in that animal. In this respect it more nearly resemblesthe mouse (see Membranes, page 61). Tissues or Organs Derived from Each Germ-layer.—Ectoderm: (i) Ectodermiclayer of chorion and amnion. (2) Epidermis with appendages (hair and nails);the epithelium of (a) all skin glands including the mammary; (6) the stomodealportion of the mouth, including the salivary glands and the enamel of the teeth;(c) the nasal passages, upper part of the pharynx, and the hypophysis; (d) theproctodeal portion of the alimentary canal; (e) the crystalline lens and the ex-ternal ear. (3) The whole of the nervous system, brain, spinal cord, nerves,ganglia, and epithelial portions of the organs of sense (retina, internal ear, olfac-tory, taste and tactile organs). Mesoderm: (i) The urinary and genital organs,except the lining of the bladder and urethra. (2) The s

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