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noun, Botany.
(in the stems of woody plants) one of the vertical bands or plates of unspecialized tissue that radiate between the pith and the bark.
any of the sheets of conducting tissue that run radially through the vascular tissue of some higher plants

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.


Read Also:

  • Medullary-sheath

    noun 1. Botany. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants. 2. Anatomy. . noun 1. (anatomy) a myelin layer surrounding and insulating certain nerve fibres 2. a layer of thick-walled cells surrounding the pith of the stems of some higher plants medullary sheath n. […]

  • Medullary sponge kidney

    medullary sponge kidney n. A cystic disease of the renal pyramids characterized by calculus formation and hematuria but usually not with renal failure.

  • Medullary space

    medullary space n. The marrow-filled central cavity together with the cellular intervals between the trabeculae of bone.

  • Medullary stria of fourth ventricle

    medullary stria of fourth ventricle n. Any of the slender fascicles of fibers extending transversely below the ependymal floor of the ventricle from the median sulcus to enter the inferior cerebellar peduncle. Also called acoustic stria.

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