Here's why:

* Pericycle: The pericycle is a layer of cells located just inside the endodermis of the root. It's responsible for the formation of lateral roots and the vascular cambium.

* Lateral root development: When a lateral root begins to form, cells in the pericycle divide and grow outwards, pushing through the cortex and epidermis to form the new root.

Let me know if you'd like to know more about how lateral root formation works!