Document Detail

Blood vessels within lymph nodes: a comparison between pigs and sheep.
MedLine Citation:
PMID:  2466312     Owner:  NLM     Status:  MEDLINE    
In sheep, most blood vessels enter the lymph nodes at a discrete hilus, which is where the capsule overlies medullary tissue. In pigs, vessels within the node arise from an extensive network of arteries on the surface, and most vessels penetrate the capsule where it overlies diffuse tissue--the counterpart of the sheep medulla. In both species the blood vessels divide extensively as they approach and supply the dense lymphoid tissue which contains lymph nodules. The blood vessels within sheep lymph nodules are surrounded by a thick layer of amorphous material. The dense lymphoid tissue has an abundant network of venules which have smooth muscle cells in their walls. These venules are involved in lymphocyte migration and in pigs they are lined by high endothelium which is similar to that in most other species, while in sheep the endothelium is much lower. Fenestrated capillaries occur in both pig and sheep lymph nodes.
H J Spalding; T J Heath
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Research in veterinary science     Volume:  46     ISSN:  0034-5288     ISO Abbreviation:  Res. Vet. Sci.     Publication Date:  1989 Jan 
Date Detail:
Created Date:  1989-04-11     Completed Date:  1989-04-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401300     Medline TA:  Res Vet Sci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  43-8     Citation Subset:  IM    
Department of Anatomy, University of Queensland, St Lucia, Australia.
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MeSH Terms
Arteries / ultrastructure
Capillaries / ultrastructure
Endothelium, Vascular / ultrastructure
Lymph Nodes / blood supply*,  cytology,  ultrastructure
Microscopy, Electron
Sheep / anatomy & histology*
Staining and Labeling
Swine / anatomy & histology*
Venules / ultrastructure

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