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Plasmodesmata. Plasmodesmata (singular, plasmodesma) are small channels that directly connect the cytoplasm of neighboring plant cells to each other, establishing living bridges between cells.
Plasmodesmata are narrow channels through the wall bound by plasmalemmma containing cytoplasm and often a desmotubule. The desmotubule is the cental core and is composed of protein subunits consists of modified membraneous structure continuous with the endoplasmic reticulam of the adjoining cells.These membraneous structures probably originate from the ER.