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Medullary ray (anatomy)

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Title: Medullary ray (anatomy)  
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Subject: Cortical lobule, Kidney, Interlobular arteries, External sphincter muscle of female urethra, Medullary interstitium
Publisher: World Heritage Encyclopedia

Medullary ray (anatomy)

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.

Additional Images


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

External links

  • medullary+ray at eMedicine Dictionary
  • 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
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