A nurse's handbook of obstetrics, for use in training-schools . Fig. 22,—Maternal surface of the placenta. (Garrigues.) 5o A NURSES HANDBOOK OF OBSTETRICS. which are twisted upon each other, and these are protected bya soft, transparent, bluish-white, gelatinous substance called Whartons jelly. During the early months of pregnancy the foetus, or em-bryo, as it is usually called, bears no resemblance whateverto the human form. At the end of four weeks the ovum () is merely a spongy-looking sphere containing a small,curved, gelatinous mass, with no evidence of head or extremities(Fig. 24),
A nurse's handbook of obstetrics, for use in training-schools . Fig. 22,—Maternal surface of the placenta. (Garrigues.) 5o A NURSES HANDBOOK OF OBSTETRICS. which are twisted upon each other, and these are protected bya soft, transparent, bluish-white, gelatinous substance called Whartons jelly. During the early months of pregnancy the foetus, or em-bryo, as it is usually called, bears no resemblance whateverto the human form. At the end of four weeks the ovum () is merely a spongy-looking sphere containing a small,curved, gelatinous mass, with no evidence of head or extremities(Fig. 24), and if an abortion occurs at this time it is almostinvariably lost in the discharge of blood. By the end of the third month it has increased considerablyin size, being about four inches in length and weighing about. Fig. 23.—Human ovum at the end of the first month. Actual size. (Woods Museum,Bellevue Hospital, No. 1193.) three and one-half ounces (Fig. 25). The head is now devel-oped, and is by far the largest part of the foetus, being nearlyone-third its entire size. The neck and extremities are alsoformed and the fingers are separated. The skin is of a palerose-color and very thin and delicate. The placenta is distinctlydeveloped, and the genital organs are formed sufficiently to per-mit recognition of the sex. From this time on the embryo iscalled the foetus. Development progresses rapidly as the weeks go by, and atthe end of the sixth month marked changes have foetus is now about twelve inches long and weighs about THE FCETUS. 51
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