Results 321 to 330 of about 854,609 (354)
Some of the next articles are maybe not open access.
Vascular responses of umbilical-placental circulation to vasodilators in fetal lambs.
American Journal of Physiology, 1991It has been suggested that the umbilical-placental circulation is maximally vasodilated under normal conditions. To test this hypothesis, we investigated the effect of vasodilators on umbilical-placental vascular resistance.
R. Paulick +2 more
semanticscholar +1 more source
Placental Vasculature and Circulation in Primates
1988When the fertilized primate ovum, whether of human, monkey, baboon, or mangabey, comes to rest on the lining epithelium of the uterus, the trophoblast of its wall promptly begins to invade the endometrium over an ever widening base (Heuser and Streeter, 1941; Enders, 1976; Houston, 1969, 1975; Enders et al., 1983).
Martin W. Donner, Elizabeth M. Ramsey
openaire +2 more sources
The anatomy and histology of placental circulation
American Journal of Obstetrics and Gynecology, 1934Abstract The greater part of our present-day knowledge of the placenta has been derived from investigation of the growth, disposition, and changes in its epithelium, as befits a glandular organ. The chemistry and biologic nature of the gland have also been investigated; likewise the pathology.
openaire +2 more sources
Investigation of placental circulations by color Doppler ultrasonography
American Journal of Obstetrics and Gynecology, 1991The placental circulations of 25 normal and five complicated pregnancies were studied by color Doppler ultrasonography. Flow velocity waveforms were obtained in all 30 pregnancies and could discriminate between fetal and maternal intraplacental blood flow.
Jauniaux, Eric +4 more
openaire +3 more sources
Physiological and Pathological Morphology of the Umbilical and Placental Circulation
Pathology - Research and Practice, 1990Closure mechanisms of fetal vessels are essential after birth. They are physiological. The speedy and characteristic constriction is made possible by the special construction of the fetal vessels. The so-called "folds of Hoboken" in the umbilical artery initially form tapered constrictions which quickly extend to longer sections of the vessel.
V. Becker, G. Röckelein, G. Kobras
openaire +2 more sources
Evidence for the Placental Origin of Hyaluronidase in the Maternal Circulation
Enzyme, 1975The level of maternal serum hyaluronidase activity was shown to rise during pregnancy. Investigation of non-pregnant females did not demonstrate hormonal control of enzyme activity. The findings of a quantitative increase in serum hyaluronidase activity during pregnancy is presented in conjunction with previous evidence of a qualitative change in this ...
Lambert Be, Salkie Ml
openaire +3 more sources
Vasoconstrictive effects of prostaglandins in sheep placental circulations
American Journal of Obstetrics and Gynecology, 1978Changes in the uterine and umbilical circulations after intra-aortic injection of prostaglandin E2 (PGE2) or protaglandin F2alpha (PGF2alpha) to either the fetus or the mother have been examined in 13 ewes at late gestation. PGF2alpha vien to either the fetus or the mother is vasoconstrictive in both uterine and umbilical circulations.
Margaret K. McLaughlin +2 more
openaire +3 more sources
Vascular responses to sodium nitroprusside in the human fetal-placental circulation.
Reproduction, Fertility and Development, 1995This study examined the activity of sodium nitroprusside (SNP) in the human fetal-placental circulation in vitro in pathological and experimental conditions in which vascular function may be impaired.
M. Read +4 more
semanticscholar +1 more source
Radioisotope (l131) studies of placental location and circulation
American Journal of Obstetrics and Gynecology, 1963A modified isotope method, requiring lower levels of radioactivity, for localization of the placenta is presented and its application in 66 patients described. A dose of 3.0 mu C of radioiodinated human serum albumin was injected into the antecubital vein, and after 10 min a collimated scintillation detector connected to a count rate meter was used to ...
Fred C. Heagy +2 more
openaire +3 more sources
EFFECT OF TERBUTALINE ON THE HUMAN FETAL PLACENTAL CIRCULATION
BJOG: An International Journal of Obstetrics & Gynaecology, 1981SummaryThe effect of terbutaline, a β2‐adrenoceptor stimulator, on the vascular resistance of isolated human placenta was examined. Terbutaline produced no change in basal placental vascular resistance, but when the placental vessels were constricted with angiotensin, terbutaline produced a graded decrease in vascular resistance.
openaire +3 more sources