Medullary ray (anatomy)

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Medullary ray
System Urinary system
TA A08.1.01.018
FMA 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.

Additional Images[edit]


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

External links[edit]

 — "Urinary System: kidney, H&E, cortex and medullary ray"

 — "Urinary System: neonatal kidney"