Placentation in Plants: Type # 5. Superficial or Laminar: Here, the ovules develop over the entire inner surface of the carpels. It occurs in multicarpellary ovary, e.g., Nymphaea. Placentation in Plants: Type # 6. Basal: The placenta develops directly on the thalamus and bears a single ovule at the base of the unilocular ovary, e.g., Compositae.
Circumvallate placenta refers to an abnormality in the shape of the placenta. The placenta is important for the development of your baby, and this condition can lead to low birth weight, placental abruption, or pregnancy loss. The condition is rare and untreatable, but complications can be managed.
Women with placenta previa often present with painless, bright red vaginal bleeding. This commonly occurs around 32 weeks of gestation, but can be as early as late mid-trimester. More than half of women affected by placenta praevia (51.6)% have bleeding before delivery.
A hydatidiform mole is a growing mass of tissue inside your womb (uterus) that will not develop into a baby. It is the result of abnormal conception. It may cause bleeding in early pregnancy and is usually picked up in an early pregnancy ultrasound scan.
The placental barrier between mother and fetus is the “leakiest” barrier and is a very poor block to chemicals. The placenta is composed of several layers of cells acting as a barrier for the diffusion of substances between the maternal and fetal circulatory systems.
Other articles where Parietal placentation is discussed: placenta: …in various ways, placentation being parietal, with carpels united by their adjacent margins and the ovules disposed along the inner ovary walls; axile, with carpels folded inward and the ovules along the central axis of the ovary; free central, derived from the axile, with a central column bearing the ovules;…
Morbidly adherent placenta (MAP) is the general clinical term used to describe the different forms of abnormal placental implantation (Accreta, Increta and Percreta). Clinical ultrasound indicators are the presence of an interruption of the bladder line, absence of a retroplacental clear zone, and the presence of placental lacunae.
In velamentous cord insertion, the umbilical cord inserts into the fetal membranes (choriamniotic membranes), then travels within the membranes to the placenta (between the amnion and the chorion). The exposed vessels are not protected by Wharton's jelly and hence are vulnerable to rupture.