Adjacent plant cells have in their walls several pores, places where there is no cellulose or any other type of material. These pores are crossed by numerous very thin membrane tubes that allow direct contact between the cytoplasm of a cell with the cytoplasm of neighboring cells, as well as the exchange of functional, structural and information molecules: the plasmodesms (from Greek, plasma = form, wean = binding). That is, plasmodesms are the structural feature cells can allow molecules to flow directly from inside one cell into the next.
