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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 generally contain two membrane-bounded tubes, one inside the other. The outer membrane tube joins the plasma membranes of the two neighboring cells. Desmotubule. The inner membrane tube is a specialized region of the ER, which connects the ER compartments of the two neighboring cells. The compact tube shape of the desmotubule is supported by a dense network of proteins specifically targeted to the plasmodesmata. Cytoplasmic Sleeve.