9:00 it is the aorta and she is opening the aortic valve and you can see the two coronary ostia (ppl of ostium) where the coronary arteries come off the aorta just above the aortic valve cusps.

• 这是主动脉。医生正在把主动脉瓣切开，你可以看到里面的两个冠状窦口。冠状窦口是冠状动脉的在主动脉的起始点。冠状窦口位于主动脉瓣叶的上方。