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The Predictability from Skull Morphology of Temporalis and Masseter Muscle Cross-Sectional Areas in Humans

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The Predictability from Skull Morphology of Temporalis and Masseter Muscle Cross-Sectional Areas in Humans. / Toro-Ibacache, Viviana; Zapata Muñoz, Victor; O'higgins, Paul.

In: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology, Vol. 298, No. 7, 23.04.2015, p. 1261-1270.

Research output: Contribution to journalArticle

Harvard

Toro-Ibacache, V, Zapata Muñoz, V & O'higgins, P 2015, 'The Predictability from Skull Morphology of Temporalis and Masseter Muscle Cross-Sectional Areas in Humans', Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology, vol. 298, no. 7, pp. 1261-1270. https://doi.org/10.1002/ar.23156

APA

Toro-Ibacache, V., Zapata Muñoz, V., & O'higgins, P. (2015). The Predictability from Skull Morphology of Temporalis and Masseter Muscle Cross-Sectional Areas in Humans. Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology, 298(7), 1261-1270. https://doi.org/10.1002/ar.23156

Vancouver

Toro-Ibacache V, Zapata Muñoz V, O'higgins P. The Predictability from Skull Morphology of Temporalis and Masseter Muscle Cross-Sectional Areas in Humans. Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology. 2015 Apr 23;298(7):1261-1270. https://doi.org/10.1002/ar.23156

Author

Toro-Ibacache, Viviana ; Zapata Muñoz, Victor ; O'higgins, Paul. / The Predictability from Skull Morphology of Temporalis and Masseter Muscle Cross-Sectional Areas in Humans. In: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology. 2015 ; Vol. 298, No. 7. pp. 1261-1270.

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@article{cb59ae5448a741b9aa9ad59e3bf4643c,
title = "The Predictability from Skull Morphology of Temporalis and Masseter Muscle Cross-Sectional Areas in Humans",
abstract = "To carry out functional simulations of the masticatory system that aim to predict strain magnitudes it is important to apply appropriate jaw-elevator muscle forces. Force magnitude estimation from directly measured muscle physiological cross-sectional area or anatomical cross-sectional area (CSA) is not possible for fossils and skeletal material from museum collections. In these cases, muscle CSAs are often estimated from bony features. This approach has been shown to be inaccurate in a prior study based on direct measurements from cadavers. Postmortem alterations as well as age changes in muscle form might explain this discrepancy. As such, the present study uses CT images from 20 living individuals to directly measure temporalis and masseter muscle CSAs and estimated cross-sectional areas (ECSAs) from bony features. The relationships between CSAs and ECSAs were assessed by comparing mean values and by examining correlations. ECSAs are up to 100{\%} greater than CSA and the means of these variables for each muscle differ significantly. Further, ECSA is significantly correlated with CSA for temporalis but not masseter. Cranial centroid size is only significantly associated with CSA for temporalis. These findings indicate that ECSAs should be employed with caution in simulations of human masticatory system functioning; they do not reflect CSAs and it is plausible that this also applies to studies of closely related living and fossil taxa. When ECSAs are used, sensitivity analyses are required to determine the impact of potential errors.",
keywords = "Computed tomography, Dry skull method of muscle area estimation, Muscle cross-sectional area, Skull size",
author = "Viviana Toro-Ibacache and {Zapata Mu{\~n}oz}, Victor and Paul O'higgins",
year = "2015",
month = "4",
day = "23",
doi = "10.1002/ar.23156",
language = "English",
volume = "298",
pages = "1261--1270",
journal = "Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology",
issn = "1932-8486",
publisher = "John Wiley and Sons Inc.",
number = "7",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - The Predictability from Skull Morphology of Temporalis and Masseter Muscle Cross-Sectional Areas in Humans

AU - Toro-Ibacache, Viviana

AU - Zapata Muñoz, Victor

AU - O'higgins, Paul

PY - 2015/4/23

Y1 - 2015/4/23

N2 - To carry out functional simulations of the masticatory system that aim to predict strain magnitudes it is important to apply appropriate jaw-elevator muscle forces. Force magnitude estimation from directly measured muscle physiological cross-sectional area or anatomical cross-sectional area (CSA) is not possible for fossils and skeletal material from museum collections. In these cases, muscle CSAs are often estimated from bony features. This approach has been shown to be inaccurate in a prior study based on direct measurements from cadavers. Postmortem alterations as well as age changes in muscle form might explain this discrepancy. As such, the present study uses CT images from 20 living individuals to directly measure temporalis and masseter muscle CSAs and estimated cross-sectional areas (ECSAs) from bony features. The relationships between CSAs and ECSAs were assessed by comparing mean values and by examining correlations. ECSAs are up to 100% greater than CSA and the means of these variables for each muscle differ significantly. Further, ECSA is significantly correlated with CSA for temporalis but not masseter. Cranial centroid size is only significantly associated with CSA for temporalis. These findings indicate that ECSAs should be employed with caution in simulations of human masticatory system functioning; they do not reflect CSAs and it is plausible that this also applies to studies of closely related living and fossil taxa. When ECSAs are used, sensitivity analyses are required to determine the impact of potential errors.

AB - To carry out functional simulations of the masticatory system that aim to predict strain magnitudes it is important to apply appropriate jaw-elevator muscle forces. Force magnitude estimation from directly measured muscle physiological cross-sectional area or anatomical cross-sectional area (CSA) is not possible for fossils and skeletal material from museum collections. In these cases, muscle CSAs are often estimated from bony features. This approach has been shown to be inaccurate in a prior study based on direct measurements from cadavers. Postmortem alterations as well as age changes in muscle form might explain this discrepancy. As such, the present study uses CT images from 20 living individuals to directly measure temporalis and masseter muscle CSAs and estimated cross-sectional areas (ECSAs) from bony features. The relationships between CSAs and ECSAs were assessed by comparing mean values and by examining correlations. ECSAs are up to 100% greater than CSA and the means of these variables for each muscle differ significantly. Further, ECSA is significantly correlated with CSA for temporalis but not masseter. Cranial centroid size is only significantly associated with CSA for temporalis. These findings indicate that ECSAs should be employed with caution in simulations of human masticatory system functioning; they do not reflect CSAs and it is plausible that this also applies to studies of closely related living and fossil taxa. When ECSAs are used, sensitivity analyses are required to determine the impact of potential errors.

KW - Computed tomography

KW - Dry skull method of muscle area estimation

KW - Muscle cross-sectional area

KW - Skull size

UR - http://www.scopus.com/inward/record.url?scp=84931574738&partnerID=8YFLogxK

U2 - 10.1002/ar.23156

DO - 10.1002/ar.23156

M3 - Article

VL - 298

SP - 1261

EP - 1270

JO - Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology

JF - Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology

SN - 1932-8486

IS - 7

ER -