Document Detail


A new interpretation of the origin of extradural space negative pressure.
MedLine Citation:
PMID:  6821625     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The negative pressure in the extradural space is the result of the interaction of hydrostatic forces created between the vertebral canal (a stiff-walled cylinder) and the dura mater, with its content of cerebro-spinal fluid (CSF), which behaves as a cylinder that can collapse according to the position of the subject. In order to corroborate this hypothesis, we have designed a model formed by a sealed, water-filled, glass cylinder ("vertebral canal"). In the interior there is a collapsible, non-distendible, water-filled cylinder ("dural sac"), in free communication with a reservoir which represents the CSF contained in the cranial cavity. Changes in the position of the model produce subatmospheric pressure in the space between both cylinders ("extradural space"), as happens in man.
Authors:
P Andrade
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  British journal of anaesthesia     Volume:  55     ISSN:  0007-0912     ISO Abbreviation:  Br J Anaesth     Publication Date:  1983 Jan 
Date Detail:
Created Date:  1983-03-17     Completed Date:  1983-03-17     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0372541     Medline TA:  Br J Anaesth     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  85-8     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Epidural Space / physiology*
Humans
Models, Biological
Models, Structural
Posture
Pressure
Spinal Canal / physiology*

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