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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.
--figure from Oparka, 1993. In some plasmodesmata, there is a region at each end of the plasmodesmal channel that is constricted and termed the neck region, where the plasma membrane component of the plasmodesmata closely associates with the central desmotubule.