medullary pyramid n.
See renal pyramid.
noun, Botany. 1. (in the stems of woody plants) one of the vertical bands or plates of unspecialized tissue that radiate between the pith and the bark. noun 1. 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, […]
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.