Hosta

In anatomy, a medullary ray (Ferrein's pyramid) is the middle part of a cortical lobule (or renal lobule). Each consists of a group of nephrons in the renal cortex.^[1] Their name is potentially misleading, as "medullary" refers to their destination, not their location. They travel perpendicular to the capsule, and extend from the cortex to the medulla. They may be visualised during urography.^[1]

Additional Images

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  Medullary rays
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  Medullary rays

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

• Histology image: 16003loa – Histology Learning System at Boston University — "Urinary System: kidney, H&E, cortex and medullary ray"
• Histology image: 15901loa – Histology Learning System at Boston University — "Urinary System: neonatal kidney"
• UIUC Histology Subject 1008