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Definition of Medullary ray
1. Noun. A sheet of vascular tissue separating the vascular bundles.
Medical Definition of Medullary ray
1. The centre of the renal lobule, which has the shape of a small, steep pyramid, consisting of straight tubular parts; these may be either ascending or descending limbs of the nephronic loop or collecting tubules. Synonym: pars radiata lobuli corticalis renis, Ferrein's pyramid, processus ferreini. (05 Mar 2000)