A study of the human placenta, physiological and pathological / by Thomas Watts Eden.

  • Eden, Thomas Watts, 1864-1946.
Date:
[1894?]
Catalogue details

Licence: Public Domain Mark

Credit: A study of the human placenta, physiological and pathological / by Thomas Watts Eden. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    PHYSIOLOGICAL AND PATHOLOGICAL. By TftOMAS Watts Eden, M.D., M.B.C.P., Physician to Out-Patients, Chelsea Hospital for Women. From the Laboratories of the Conjoint Board of the Royal Colleges of Physicians (Bond.) and Surgeons (Eng.). (Plates XIX. to XXII.) Part I.—Development and Normal Structure. The object of this paper is to give some account of the minute structure of the human placenta, with especial reference to its develop- ment. Eor the sake of brevity, a description of the macroscopic characters of the placenta is omitted, and some of the better known points of histology are only briefly alluded to. For reasons which will afterwards appear, the normal structure of the placenta must be studied in specimens obtained not later than the mid-term of gestation. This paper is therefore not concerned with the placenta at the full term. Frequent references are made to the very voluminous literature of the subject, and a list of all such references will be found at the end of the paper. The placenta consists of two distinct series of structures; one developed from the ovum, the foetal placenta ; the other developed from the uterus, the maternal placenta. The two parts, of which the placenta is composed, are best studied separately. A. The Foetal Placenta. The foetal placenta is an elaboration of the outer fcetal envelope or chorion ; it is therefore necessary, in the first place, to trace briefly the development of this membrane. Yery few facts are known concerning the development of the human ovum, during the first 14 days of its existence. Beichert C38)1 and His (13) have described human ova of about 12-13 days; in them the decidua reflexa was fully formed, and chorionic villi