Medullary ray (anatomy)

Medullary ray
Details
System	Urinary system
Identifiers
TA	A08.1.01.018
FMA	76499
*Anatomical terminology* [edit on Wikidata]

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 connected 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

Medullary rays
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

Anatomy of the urinary system

Kidneys

Layers

Circulation

Arteries
Veins

Nephron

Renal corpuscle	Glomerulus Bowman's capsule Glomerular basement membrane Podocyte Filtration slits Mesangium Intraglomerular mesangial cell

Renal tubule	Proximal convoluted tubule Loop of Henle Descending Thin ascending Thick ascending Distal convoluted tubule Connecting tubule Collecting ducts Tubular fluid Renal papilla Minor calyx Major calyx Renal pelvis

Juxtaglomerular apparatus	Macula densa Juxtaglomerular cells Mesangium Extraglomerular mesangial cell

Ureters

Bladder

Urethra

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