1
40
2
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Text
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<a href="http://doi.org/10.1016/j.archoralbio.2019.05.015" target="_blank" rel="noreferrer noopener">http://doi.org/10.1016/j.archoralbio.2019.05.015</a>
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Pages
35-45
Volume
105
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Title
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The influence of masseter and temporalis sarcomere length operating ranges as determined by laser diffraction on architectural estimates of muscle force and excursion in macaques (Macaca fascicularis and Macaca mulatta)
Publisher
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Archives of Oral Biology
Date
A point or period of time associated with an event in the lifecycle of the resource
2019
2019-09
Subject
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Fiber length; Macaque; Masseter; Sarcomere length; Temporalis
Creator
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Taylor Andrea B; Terhune Claire E; Vinyard Christopher J
Description
An account of the resource
OBJECTIVE: Determine sarcomere length (Ls) operating ranges of the superficial masseter and temporalis in vitro in a macaque model and examine the impact of position-dependent variation on Ls and architectural estimates of muscle function (i.e., fiber length, PCSA) before and after Ls-normalization. DESIGN: Heads of adult Macaca fascicularis (n = 4) and M. mulatta (n = 3) were bisected postmortem. One side of the jaw was fixed in occlusion, the other in maximum gape. Ls was measured bilaterally using laser diffraction and these measurements were used to estimate sarcomere-length operating ranges. Differences in fiber length and PCSA between sides were tested for significance prior to and following Ls-normalization. RESULTS: Sarcomere-length operating ranges were widest for the anterior superficial masseter and narrowest for the posterior temporalis. Compared with other mammals, macaque operating ranges were wider and shifted to the right of the descending limb of a representative length-tension curve. Fibers were significantly stretched by as much as 100%, and PCSAs reduced by as much as 43%, on the maximally gaped compared with occluded sides. Ls-normalization substantially reduced position-dependent variance. CONCLUSIONS: The superficial masseter ranges between 87-143% and the temporalis between 88-130% of optimal Ls from maximum gape to occlusion, indicating maximum relative Ls for these macaque muscles exceeds the upper end range previously reported for the jaw muscles of smaller mammals. The wider macaque operating ranges may be functionally linked to the propensity for facially prognathic primates to engage in agonistic canine display behaviors that require jaw-muscle stretch to facilitate production of wide jaw gapes.
Identifier
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<a href="http://doi.org/10.1016/j.archoralbio.2019.05.015" target="_blank" rel="noreferrer noopener">10.1016/j.archoralbio.2019.05.015</a>
2019
Archives of oral biology
Department of Anatomy & Neurobiology
fiber length
Macaque
Masseter
NEOMED College of Medicine
Sarcomere length
September 2019 Update
Taylor Andrea B
Temporalis
Terhune Claire E
Vinyard Christopher J
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Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
URL Address
<a href="http://doi.org/10.1016/s0003-9969(96)00056-8" target="_blank" rel="noreferrer noopener">http://doi.org/10.1016/s0003-9969(96)00056-8</a>
Pages
1053–1063
Issue
11
Volume
41
Dublin Core
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Title
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Variation in quantitative measures of enamel prisms from different species as assessed using confocal microscopy.
Publisher
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Archives of oral biology
Date
A point or period of time associated with an event in the lifecycle of the resource
1996
1996-11
Subject
The topic of the resource
Animals; Chiroptera/anatomy & histology; Confocal; Crystallography; Dental Enamel/*ultrastructure; Electron; Galago/anatomy & histology; Insectivora/anatomy & histology; Lemur/anatomy & histology; Lemuridae/anatomy & histology; Mammals/*anatomy & histology; Microscopy; Primates/anatomy & histology; Scanning; Species Specificity
Creator
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Dumont E R
Description
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This study presents a statistical analysis of variability in six measures of enamel prism and ameloblast size and spacing gathered using confocal microscopy, and applies the results to a consideration of appropriate sampling strategies for taxonomic analyses. Variability within individuals was examined within depth series. Individual variability was also assessed within a nested analysis of variation for prism measurements between micrographs, specimens and species. While sample depth was not often significantly associated with differences in prism and ameloblast measures, there was significant variation between micrographs taken from the same region of a tooth. The highest levels of variation were found between species, while variation between conspecific individuals was relatively small. These results demonstrate that data gathered from several micrographs are likely to be representative of a specimen, but that several micrographs of a single specimen will rarely illustrate the range of variation contained within a species. It is essential for systematic and taxonomic analyses that several micrographs be used to characterize an individual. It is also recommended that samples from several individuals be used to characterize species. While data from isolated specimens is often of great interest, taxonomic or systematic conclusions based on isolated individuals should be approached cautiously.
Identifier
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<a href="http://doi.org/10.1016/s0003-9969(96)00056-8" target="_blank" rel="noreferrer noopener">10.1016/s0003-9969(96)00056-8</a>
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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
1996
Animals
Archives of oral biology
Chiroptera/anatomy & histology
Confocal
Crystallography
Dental Enamel/*ultrastructure
Dumont E R
Electron
Galago/anatomy & histology
Insectivora/anatomy & histology
Lemur/anatomy & histology
Lemuridae/anatomy & histology
Mammals/*anatomy & histology
Microscopy
Primates/anatomy & histology
Scanning
Species Specificity