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When spontaneous rupture of the amnion occurs early in the second trimester, the separation of amnion from chorion produces many small, thin strands that can become entangled within digits and toes. [10] [11] Later, as the fetus grows but the bands do not, the bands become constricting. This constriction reduces blood circulation, and hence ...
The trophoblast layer differentiates into amnion and the chorion, which then comprise the fetal membranes. [4] The amnion is the innermost layer and, therefore, contacts the amniotic fluid, the fetus and the umbilical cord. [5] The internal pressure of the amniotic fluid causes the amnion to be passively attached to the chorion. [4]
The chorion and amnion membranes are labelled in this depiction of a growing fetus in the uterus. The amniotic sac consists of two parts: The outer membrane is the chorion. It is closest to the mother and physically supports the much thinner amnion. The chorion is the last and outermost of the membranes that make up the amniotic sac. [13]
The yolk sac, amnion, chorion, and allantois are the four extraembryonic membranes that lie outside of the embryo and are involved in providing nutrients and protection to the developing embryo. [5] They form from the inner cell mass; the first to form is the yolk sac followed by the amnion which grows over the developing embryo. The amnion ...
Chorion, amnion and gestational (yolk) sac. Chorionic hematomas can be caused by the separation of the chorion from the endometrium (inner membrane of the uterus). Hematomas are classified by their location between tissue layers: [4] Subchorionic hematomas, the most common type, are between the chorion and endometrium.
This is a shortened version of the eleventh chapter of the ICD-9: Complications of Pregnancy, Childbirth, and the Puerperium. It covers ICD codes 630 to 679. The full chapter can be found on pages 355 to 378 of Volume 1, which contains all (sub)categories of the ICD-9. Volume 2 is an alphabetical index of Volume 1.
chorion. Also serosa and false amnion. 1. One of four extraembryonic membranes formed during the development of amniotes, arising from trophoblast and somatopleure as a corollary of the amnion and enclosing both the amnion and the allantois. The chorion provides the fetal contribution to the formation of the placenta. [1] [2] 2.
The fetus should be at least 15 weeks' gestation and the chorion and amnion should be fused. [ 5 ] Amniocentesis is a sterile procedure, therefore medical personnel performing and assisting with the procedure will scrub with antiseptic solution, use sterile gloves, clean the maternal abdomen with antiseptic solution, cover the ultrasound probe ...