Pattern. 1  the pattern will be compared to the name. * 2  is a wildcard that will match zero or more letters example: *oo* will match names which contain oo. _ 3  is a wildcard that will match exactly one letter example: __z will match names which have two letters and then a z.
Normally, the placenta is attached to the uterus above the cervix. In rare cases, the placenta forms low in the uterus and is partially or completely covering the cervix. When the placenta is blocking the cervix, it is called placenta previa. Placents posterior mean high risk in doctor's language Posterior means back.
placenta preÂ·viÂ·a. n. A condition in which the placenta is implanted in the lower segment of the uterus so that it is adjacent to or obstructs the internal opening of the cervix. It may cause maternal hemorrhage prior to or during labor. Also called placental presentation.