Anatomically, root is distinguishable into following layers or regions sequentially
Epiblema $\rightarrow$ Cortex $\rightarrow$ Endodermis $\rightarrow$ Pericycle $\rightarrow$ Vascular system $\rightarrow$ Pith
Epiblemais the outermost piliferous layer of root tissue.
Cortex is the extrastelar fundamental tissue of the sporophyte.
Endodermis is the most innermost layer of cortex, surrounding the pericycle.

Pericycle is an external layer of stele or the later between endodermis and conducting tissues.