Document Detail

Entry of nephrons into the collecting duct network of the avian kidney: a comparison of chickens and desert quail.
MedLine Citation:
PMID:  8315649     Owner:  NLM     Status:  MEDLINE    
The avian kidney contains a population of nephrons with and without loops of Henle. How the collecting ducts of this heterogeneous population of nephrons merge to exit as single ducts from the medullary cones has been uncertain. The results of this study show that the collecting duct tree begins with the coalescence of the distal tubules of pairs of loopless nephrons. These primary collecting ducts receive output from only loopless nephrons. Primary collecting ducts fuse in pairs and become secondary collecting ducts. They receive the distal tubules of transition nephrons. Pairs of secondary collecting ducts fuse and become tertiary collecting ducts. Tertiary collecting ducts receive the distal tubules of looped nephrons. Thus, the fluid from all nephron types comingles as it passes through the medullary cone. The results of this study also show that the anatomical arrangement of medullary cones does not permit the output from one medullary cone to enter a second medullary cone. Thus, all the medullary cones function as parallel units. This anatomical organization of the avian kidney affects its ability to produce a urine hyperosmotic to the plasma.
S L Boykin; E J Braun
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of morphology     Volume:  216     ISSN:  0362-2525     ISO Abbreviation:  J. Morphol.     Publication Date:  1993 Jun 
Date Detail:
Created Date:  1993-07-29     Completed Date:  1993-07-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0406125     Medline TA:  J Morphol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  259-69     Citation Subset:  IM    
Department of Physiology, College of Medicine, University of Arizona, Tucson 85724.
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MeSH Terms
Chickens / anatomy & histology*
Kidney Tubules, Collecting / anatomy & histology*
Loop of Henle / anatomy & histology
Nephrons / anatomy & histology*
Quail / anatomy & histology*
Species Specificity

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