Explain the structure and function of plasmodesmata with help of diagram?

Plasmodesmata are microscopic channels that traverse the cell walls of plant cells and some algal cells, facilitating transport and communication between them. They are crucial for the transport of water, ions, small molecules, proteins, and even RNA, enabling coordination of cellular activities across tissues.

Structure of Plasmodesmata
Cell Wall: Plasmodesmata are embedded within the cell wall of plant cells, connecting adjacent cells.
Plasma Membrane: The plasma membrane of plasmodesmata is continuous with the plasma membrane of adjacent cells, forming a continuous boundary.
Cytoplasmic Sleeve: This is the space between the desmotubule and the plasma membrane, through which small molecules and ions can pass.
Desmotubule: A narrow tube of endoplasmic reticulum (ER) that runs through the plasmodesmata, connecting the ER of adjacent cells.