Document Detail

The membranous part of the human interventricular cardiac septum.
MedLine Citation:
PMID:  9574484     Owner:  NLM     Status:  MEDLINE    
The arrangement of collagen and elastic fibers of the membranous part of the interventricular septum (PMS) was studied in hearts from adult humans. Connective bundles formed a network of fairly independent tendons arranged in two layers. The tendinous bundles consisted essentially of type I collagen fibers while type III fibers were visible as a thin network with transversely and longitudinally oriented meshes around the muscle bundles. Cranial and caudal to the PMS were narrow and irregular bands of collagen fibers that apparently represented zones of low resistance to the high blood pressures acting from the left to the right heart chambers. The predominance of fiber bundles arranged in an approximately transverse direction with regard to the arterial cone axis suggests a resistance to enlargement resulting from high aortic blood pressure. Elastic fibers were observed in the transitional zone between the cardiac muscle and the PMS. They were continuous with elaunin fibers and these with oxytalan fibers closely intermingled with the narrow network of type I collagen fibers of the PMS. The successive transformation of elastic fibers, which were very numerous in the muscle-tendon transition, into elaunin and these into oxytalan fibers toward the central portions of the PMS suggests a functional sequence characterized by a high elasticity and consequent mobility of the transition region itself and by a progressive increase of resistance in this portion.
C A Ferraz-de-Carvalho; E A Liberti
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Surgical and radiologic anatomy : SRA     Volume:  20     ISSN:  0930-1038     ISO Abbreviation:  Surg Radiol Anat     Publication Date:  1998  
Date Detail:
Created Date:  1998-06-24     Completed Date:  1998-06-24     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8608029     Medline TA:  Surg Radiol Anat     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  13-21     Citation Subset:  IM    
Department of Anatomy, University of São Paulo, Brasil.
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MeSH Terms
Collagen / ultrastructure
Elastic Tissue / anatomy & histology,  ultrastructure
Heart / anatomy & histology*
Heart Septum / anatomy & histology,  ultrastructure
Heart Ventricles / anatomy & histology
Microscopy, Electron, Scanning
Microscopy, Polarization
Middle Aged
Reg. No./Substance:

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