What is the name of the growth layers of the trunk or branches of the tree, which are visible

What is the name of the growth layers of the trunk or branches of the tree, which are visible in the cross section in the form of concentric rings?

The growth layers of wood are called growth rings. Each year one such ring appears, which consists of a light and a dark part. This is due to the fact that in spring cambium cells are actively dividing and create a wide area of early wood, which is visible on the transverse section of the trunk as the light part of the ring. In summer, late wood is formed, on the cut it looks like a dark part of the ring, which is much narrower than light. By the number of annual rings, you can find out the age of the plant.