QS Study

Medullary ray or connective tissue:

Thin walled parenchyma tissue that separates xylem and phloem bundles forms the medullary ray or connective tissue. The cells in each ray are elongate and horizontal. These are living cells, unlike the dead cells of the wood xylem. The rays allow the radial diffusion of sap. They are used for food and nutrients transport.


Medullary rays are strips of parenchyma present between vascular bundles of dicot stem. It keeps a bond in between pericycle and medulla. They keep up a living link between the pith and the cortex. The functions of medullary rays are:

  • food storage
  • deposition of tannins, crystals etc.
  • radial transport of food and water
  • gaseous exchange through the intercellular spaces.