A treatise on the science and practice of midwifery . oints to the left (Fig. 99) sacro-iliac synchondrosis, and thefinger impinges on the right parietal bone. The mechanism is pre-cisely the same as in the third position, the rotation taking placefrom left to right. Formation of the Caput Succedaneum.—The formation of the caputsuccedaneum has been already alluded to. This term is applied tothe oeclematous swelling which forms on the head, and is producedby effusion from the obstruction of the venous circulation caused bythe pressure to which the head is subjected. It follows that the sizeof t
A treatise on the science and practice of midwifery . oints to the left (Fig. 99) sacro-iliac synchondrosis, and thefinger impinges on the right parietal bone. The mechanism is pre-cisely the same as in the third position, the rotation taking placefrom left to right. Formation of the Caput Succedaneum.—The formation of the caputsuccedaneum has been already alluded to. This term is applied tothe oeclematous swelling which forms on the head, and is producedby effusion from the obstruction of the venous circulation caused bythe pressure to which the head is subjected. It follows that the sizeof the swelling is in direct proportion to the length of the labor. Inrapid deliveries, in which the head is forced through the pelvisquickly, it is scarcely, if at all, developed; while, after protractedlabors, it is large and distinct, and may obscure the diagnosis of the DELIVERY IN HEAD PRESENTATIONS. 267 position, by preventing the sutures and fontanelles being felt. Itssituation varies according to the position of the head: thus, in the Fig. Fourth Position of Occiput at Pelvic Brim. first and fourth positions it forms on the right parietal bone, in thesecond and third on the left; and we may, therefore, verify, byinspection of its site, the accuracj^ of our diagnosis. An ordinary mistake which has been made by obstetricians is toregard the caput succeclaneum as formed at the point where thehead has been most subjected to pressure; while, in fact, it forms onthat part which is most unsupported by the maternal structures, andwhere the swelling may consequently most readily occur. There-fore, in the early stages of the labor, it always forms on the part ofthe head which lies in the circle of the os uteri; while, in. subsequentstages, it forms on that which lies in the axis of the vaginal canal,and eventually is most prominent on the part that is first expelledfrom the vulva. Alteration in the Shape of the Head from Moulding.—A few wordsmay be said as to the alteration
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
