| Functional anatomy of incisal biting in Aplodontia rufa and sciuromorph rodents - part 2: sciuromorphy is efficacious for production of force at the incisors. | |
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MedLine Citation:
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PMID: 20160427 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The protrogomorph condition of the rodent masticatory apparatus is thought to be present in only one living species, the mountain beaver Aplodontia rufa. The major anatomical difference between protrogomorphs and sciuromorphs is that the relative size of one part of the masseter muscle, the anterior lateral masseter, is much greater in sciuromorphs than in protrogomorphs. The mechanics of force production at the incisors were compared in A. rufa and six sciuromorph rodents. Is the sciuroid masticatory apparatus more effective for production of forces at the incisors during biting than the primitive, protrogomorph condition? To answer this question, three measures of mechanical ability were employed and three hypotheses were tested: (1) the mechanical advantage of the adductor musculature is greater in sciuromorphs than in A. rufa; (2) the relative force produced at the incisors is greater in sciuromorphs than in A. rufa, and (3) the relative amount of force produced that can be used to drive the incisors into an object, is greater in sciuromorphs than in A. rufa. The results demonstrated that the protrogomorph, A. rufa, is not as efficient at generating bite forces at the incisors as the sciuromorphs. |
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Authors:
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Robert E Druzinsky |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2010-02-16 |
Journal Detail:
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Title: Cells, tissues, organs Volume: 192 ISSN: 1422-6421 ISO Abbreviation: Cells Tissues Organs (Print) Publication Date: 2010 |
Date Detail:
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Created Date: 2010-06-16 Completed Date: 2010-10-11 Revised Date: 2011-07-28 |
Medline Journal Info:
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Nlm Unique ID: 100883360 Medline TA: Cells Tissues Organs Country: Switzerland |
Other Details:
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Languages: eng Pagination: 50-63 Citation Subset: IM |
Copyright Information:
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Copyright 2010 S. Karger AG, Basel. |
Affiliation:
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Departments of Occupational Therapy, Governors State University, University Park, IL 60484, USA. r-druzinsky @ govst.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biomechanics Bite Force Incisor / physiology* Jaw / physiology Masseter Muscle / physiology Masticatory Muscles / anatomy & histology, physiology Rodentia / anatomy & histology, physiology* |
| Grant Support | |
ID/Acronym/Agency:
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R03 DE06279/DE/NIDCR NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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