Source:http://linkedlifedata.com/resource/umls/id/C1167198
GO: A tightly wound cylinder of membrane that is located within the plasmodesmal pore and runs the length of the plasmodesma. The desmotubule likely provides a rigid stability to plasmodesmata and confers a fixed diameter and pore size to the plasmodesmal canal, and is linked to the endoplasmic reticulum in each of the adjacent cell. [http://biology.kenyon.edu/edwards/project/greg/pd.htm]