Document Detail


Functional anatomy of the footpad vasculature of dogs: scanning electron microscopy of vascular corrosion casts.
MedLine Citation:
PMID:  21438930     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Dogs are well adapted to cold climates and they can stand, walk and run on snow and ice for long periods of time. In contrast to the body trunk, which has, dense fur, the paws are more exposed to the cold due to the lack of fur insulation. The extremities have a high surface area-to-volume ratio, so they lose heat very easily. We offer anatomical evidence for a heat-conserving structure associated with dog footpad vasculature. Methylmethacrylate vascular corrosion casts for scanning electron microscopy, Indian ink-injected whole-mount and histological specimens were each prepared, in a series of 16 limbs from four adult dogs. Vascular casts and Indian ink studies showed that abundant venules were arranged around the arteries supplying the pad surface and formed a vein-artery-vein triad, with the peri-arterial venous network intimately related to the arteries. In addition, numerous arteriovenous anastomoses and well-developed venous plexuses were found throughout the dermal vasculature. The triad forms a counter-current heat exchanger. When the footpad is exposed to a cold environment, the counter-current heat exchanger serves to prevent heat loss by recirculating heat back to the body core. Furthermore, the arteriovenous anastomoses shift blood flow, draining blood to the skin surface, and the venous plexuses retain warm blood in the pad surface. Hence, the appropriate temperature for the footpad can be maintained in cold environments.
Authors:
Hiroyoshi Ninomiya; Emi Akiyama; Kanae Simazaki; Atsuko Oguri; Momoko Jitsumoto; Takaaki Fukuyama
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-28
Journal Detail:
Title:  Veterinary dermatology     Volume:  -     ISSN:  1365-3164     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9426187     Medline TA:  Vet Dermatol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2011 The Authors. Veterinary Dermatology. © 2011 ESVD and ACVD.
Affiliation:
Yamazaki Gakuen University, 4-7-2 Minami-osawa, Hachiouji, Tokyo 192-0364, Japan.
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