1
40
3
-
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/10.1002/ajpa.20058" target="_blank" rel="noreferrer noopener">http://doi.org/10.1002/ajpa.20058</a>
Rights
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
Pages
35-56
Issue
1
Volume
128
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Ternporalis Function In Anthropoids And Strepsirrhines: An Emg Study
Publisher
An entity responsible for making the resource available
American Journal of Physical Anthropology
Date
A point or period of time associated with an event in the lifecycle of the resource
2005
2005-09
Subject
The topic of the resource
adductor muscle force; Anthropology; biomechanics; electromyography; Evolutionary Biology; fusion; galago crassicaudatus; invivo bone strain; jaw-adductor muscle force; macaca-fascicularis; mandibular symphysis; masseter force; mastication; patterns; postorbital septum; primates; temporalis
Creator
An entity primarily responsible for making the resource
Hylander W L; Wall C E; Vinyard C J; Ross C; Ravosa M R; Williams S H; Johnson K R
Description
An account of the resource
The major purpose of this study is to analyze anterior and posterior temporalis muscle force recruitment and firing patterns in various anthropoid and strepsirrhine primates. There are two specific goals for this project. First, we test the hypothesis that in addition to transversely directed muscle force, the evolution of symphyseal fusion in primates may also be linked to vertically directed balancing-side muscle force during chewing (Hylander et al. [2000] Am. J. Phys. Anthropol. 112:469-492). Second, we test the hypothesis of whether strepsirrhines retain the hypothesized primitive mammalian condition for the firing of the anterior temporalis, whereas anthropoids have the derived condition (Weijs [1994] Biomechanics of Feeding in Vertebrates; Berlin: Springer-Verlag, p. 282-320). Electromyographic (EMG) activities of the left and right anterior and posterior temporalis muscles were recorded and analyzed in baboons, macaques, owl monkeys, thick-tailed galagos, and ring-tailed lemurs. In addition, as we used the working-side superficial masseter as a reference muscle, we also recorded and analyzed EMG activity of the left and right superficial masseter in these primates. The data for the anterior temporalis provided no support for the hypothesis that symphyseal fusion in primates is linked to vertically directed jaw muscle forces during mastication. Thus, symphyseal fusion in primates is most likely mainly linked to the timing and recruitment of transversely directed forces from the balancing-side deep masseter (Hylander et al. [2000] Am. J. Phys. Anthropol. 112:469-492). In addition, our data demonstrate that the firing patterns for the working- and balancing-side anterior temporalis muscles are near identical in both strepsirrhines and anthropoids. Their working- and balancing-side anterior temporalis muscles fire asynchronously and reach peak activity during the power stroke. Similarly, their working- and balancing-side posterior temporalis muscles also fire asynchronously and reach peak activity during the power stroke. Compared to these strepsirrhines, however, the balancing-side posterior temporalis of anthropoids appears to have a relatively delayed firing pattern. Moreover, based on their smaller W/B ratios, anthropoids demonstrate a relative increase in muscle-force recruitment of the balancing-side posterior temporalis. This in turn suggests that anthropoids may emphasize the duration and magnitude of the power stroke during mastication. This hypothesis, however, requires additional testing. Furthermore, during the latter portion of the power stroke, the late activity of the balancing-side posterior temporalis of anthropoids apparently assists the balancing-side deep masseter in driving the working-side molars through the terminal portion of occlusion.
Identifier
An unambiguous reference to the resource within a given context
<a href="http://doi.org/10.1002/ajpa.20058" target="_blank" rel="noreferrer noopener">10.1002/ajpa.20058</a>
Format
The file format, physical medium, or dimensions of the resource
Journal Article or Conference Abstract Publication
2005
adductor muscle force
American journal of physical anthropology
Anthropology
biomechanics
Electromyography
Evolutionary Biology
fusion
galago crassicaudatus
Hylander W L
invivo bone strain
jaw-adductor muscle force
Johnson K R
Journal Article or Conference Abstract Publication
macaca-fascicularis
mandibular symphysis
masseter force
Mastication
patterns
postorbital septum
Primates
Ravosa M R
Ross C
Temporalis
Vinyard C J
Wall C E
Williams S H
-
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/10.1002/ajpa.21529" target="_blank" rel="noreferrer noopener">http://doi.org/10.1002/ajpa.21529</a>
Rights
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
Pages
531-547
Issue
4
Volume
145
Search for Full-text
Locate full-text within NEOMED Library's e-journal collections
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Functional And Evolutionary Significance Of The Recruitment And Firing Patterns Of The Jaw Adductors During Chewing In Verreaux's Sifaka (propithecus Verreauxi)
Publisher
An entity responsible for making the resource available
American Journal of Physical Anthropology
Date
A point or period of time associated with an event in the lifecycle of the resource
2011
2011-08
Subject
The topic of the resource
Anthropology; biomechanics; bone-strain; electromyography; Evolutionary Biology; Force; fusion; lemurs lemur-catta; macaca-fascicularis; mandibular symphysis; masseter force; mastication; muscle; primates; strepsirrhines; wishboning
Creator
An entity primarily responsible for making the resource
Hylander W L; Vinyard C J; Wall C E; Williams S H; Johnsonl K R
Description
An account of the resource
Jaw-muscle electromyographic (EMG) patterns indicate that compared with thick-tailed galagos and ring-tailed lemurs, anthropoids recruit more relative EMG from their balancing-side deep masseter, and that this muscle peaks late in the power stroke. These recruitment and firing patterns in anthropoids are thought to cause the mandibular symphysis to wishbone (lateral transverse bending), resulting in relatively high symphyseal stresses. We test the hypothesis that living strepsirrhines with robust, partially fused symphyses have muscle recruitment and firing patterns more similar to anthropoids, unlike those strepsirrhines with highly mobile unfused symphyses. Electromyographic (EMG) activity of the superficial and deep masseter, anterior and posterior temporalis, and medial pterygoid muscles were recorded in four dentally adult Verreaux's sifakas (Propithecus verreauxi). As predicted, we find that sifaka motor patterns are more similar to anthropoids. For example, among sifakas, recruitment levels of the balancing-side (b-s) deep masseter are high, and the b-s deep masseter fires late during the power stroke. As adult sifakas often exhibit nearly complete symphyseal fusion, these data support the hypothesis that the evolution of symphyseal fusion in primates is functionally linked to wishboning. Furthermore, these data provide compelling evidence for the convergent evolution of the wishboning motor patterns in anthropoids and sifakas. Am J Phys Anthropol 145:531-547, 2011. (C) 2011 Wiley-Liss, Inc.
Identifier
An unambiguous reference to the resource within a given context
<a href="http://doi.org/10.1002/ajpa.21529" target="_blank" rel="noreferrer noopener">10.1002/ajpa.21529</a>
Format
The file format, physical medium, or dimensions of the resource
Journal Article or Conference Abstract Publication
2011
American journal of physical anthropology
Anthropology
biomechanics
bone-strain
Electromyography
Evolutionary Biology
force
fusion
Hylander W L
Johnsonl K R
Journal Article or Conference Abstract Publication
lemurs lemur-catta
macaca-fascicularis
mandibular symphysis
masseter force
Mastication
Muscle
Primates
strepsirrhines
Vinyard C J
Wall C E
Williams S H
wishboning
-
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/10.1002/ajp.20189" target="_blank" rel="noreferrer noopener">http://doi.org/10.1002/ajp.20189</a>
Rights
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
Pages
329-346
Issue
3
Volume
67
Search for Full-text
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Mechanical properties of foods used in experimental studies of primate masticatory function
Publisher
An entity responsible for making the resource available
American Journal of Primatology
Date
A point or period of time associated with an event in the lifecycle of the resource
2005
2005-11
Subject
The topic of the resource
biomechanical analysis; elastic modulus; etectromyography; fracture-toughness; fracture-toughness; genus cebus; jaw; lateral pterygoid muscle; macaca-fascicularis; mandibular symphysis; masseter force; mechanical properties; movement; old-world monkeys; periodontal mechanoreceptive afferents; Zoology
Creator
An entity primarily responsible for making the resource
Williams S H; Wright B W; Den Truong V; Daubert C R; Vinyard C J
Description
An account of the resource
In vivo studies, of jaw-muscle behavior have been integral factors in the development of our current understanding of the primate masticatory apparatus. However, even though it has been shown that food textures and mechanical properties influence jaw-muscle activity during mastication, very little effort has been made to quantify the relationship between the elicited masticatory responses of the subject and the mechanical proper-ties of the foods that are eaten. Recent work on human mastication highlights the importance of two mechanical properties-toughness and elastic modulus (i.e., stiffness)-for food breakdown during mastication. Here we provide data on the toughness and elastic modulus of the majority of foods used in experimental studies of the nonhuman primate masticatory apparatus. Food toughness ranges from approximately 56.97Jm(-2) (apple pulp) to 4355.45 Jm(-2) (prune pit). The elastic modulus of the experimental foods ranges from 0.07 MPa for gummy bears to 346 MPa for popcorn kernels. These data can help researchers studying primate mastication select among several potential foods with broadly similar mechanical properties. Moreover, they provide a framework for understanding how jaw-muscle activity varies with food mechanical properties in these studies.
Identifier
An unambiguous reference to the resource within a given context
<a href="http://doi.org/10.1002/ajp.20189" target="_blank" rel="noreferrer noopener">10.1002/ajp.20189</a>
Format
The file format, physical medium, or dimensions of the resource
Journal Article
2005
American journal of primatology
biomechanical analysis
Daubert C R
Den Truong V
Elastic Modulus
etectromyography
fracture-toughness
genus cebus
jaw
Journal Article
lateral pterygoid muscle
macaca-fascicularis
mandibular symphysis
masseter force
mechanical properties
Movement
old-world monkeys
periodontal mechanoreceptive afferents
Vinyard C J
Williams S H
Wright B W
Zoology