What is meant by apoplastic pathway?Why does it occur in cortex and not in endodermis?

The apoplast pathway involves the movement of water through the adjacent cell walls of the epidermis and cortex with out entering the cytoplasm. Apoplast is a system of adjacent cell walls that are continuous, except at the casparian strips of the endodermis. The movement of water is restricted at the casparian strips of the root endodermis. Thus, due to presence of caparian strips water does not move by apoplast in endodermis.