Figure 3. Plasmodesmata. Plasmodesmata connect cytoplasms of adjacent cells by traversing the cell wall. Appressed endoplasmic reticulum, called the desmotubule, runs through the plasma membrane-lined pore. Molecules move via the cytoplasmic sleeve between the desmotubule and plasma membrane. Callose is deposited at the neck region in the cell wall. CW, cell wall; PM, plasma membrane; ER, endoplasmic reticulum.