Researchers found: 65% of pregnancies with a fetal pole and yolk sac later showed a heartbeat by 7–8 weeks. Incorrect dating accounted for 40% of cases where no heartbeat was detected early.

The yolk sac plays an important part in the early stages of pregnancy. Find out what it does and how it works.

A fetal pole means that the arms and legs developed to variable extents, depending on gestational age. A yolk sac is a structure that provides nourishment to the fetus while the placenta is ...

When 15-day fetal mouse duodenum is cultured in presence of half of the human yolk sac (HYS), villi and crypts differentiate in the duodenal segments. It appears that HYS also has a CDF activity.

What anti-abortion bills call a “heartbeat” is a bit of motion in the thickened side of an embryo’s minuscule yolk sac. Since the thickened end is called the fetal pole, a more accurate term ...

Early in a pregnancy, the embryo’s yolk sac (an external membrane that allows blood to form and will eventually be subsumed into the fetus’s body) thickens at one end.