= annotation - select to reveal
- The cervical star is an area devoid of maternal villi, overlying the cervix.
- Here, it is covering the head of a near-term fetus that was removed from a uterus.
- The placenta usually ruptures here at birth, but occasionally it ruptures a few centimeters away.
- Note that the bright red chorion seen here should not normally be seen until a foal has been born. If it is seen during birth, it is detaching from the endometrium prematurely (a form of placenta previa). This is an emergency and the foal should be delivered as soon as possible to prevent intra-natal death.