Medullary ray (anatomy)

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Medullary ray
System Urinary system
Anatomical terminology

In anatomy, the medullary ray (Ferrein's pyramid) is the middle part of the cortical lobule or renal lobule, consisting of a group of straight tubes to the collecting ducts.

Their name is potentially misleading -- the "medullary" refers to their destination, not their location. They travel perpendicular to the capsule and extend from the cortex to the medulla.

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This article incorporates text from a public domain edition of Gray's Anatomy.

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