| (in the stems of woody plants) one of the vertical bands or plates of unspecialized tissue that radiate between the pith and the bark. |
| pith ray n. The parenchymatous tissue that extends between the vascular bundles of a stem or root. |
medullary ray n.
The center of the renal, cortical lobule, consisting of the ascending or descending limbs of the nephronic loop or of the collecting tubules. Also called Ferrein's pyramid.
