Medullary ray (anatomy)

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Medullary ray
System Urinary system
TA A08.1.01.018
FMA 76499
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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