Ontogenetic changes to muscle architectural properties within the jaw-adductor musculature of Macaca fascicularis

American Journal of Physical Anthropology
Edwin DickinsonKornelius Kupczik

Abstract

Changes to soft- and hard-tissue components of the masticatory complex during development can impact functional performance by altering muscle excursion potential, maximum muscle forces, and the efficiency of force transfer to specific bitepoints. Within Macaca fascicularis, older individuals exploit larger, more mechanically resistant food items and more frequently utilize wide-gape jaw postures. We therefore predict that key architectural and biomechanical variables will scale during ontogeny to maximize bite force and gape potential within older, larger-bodied individuals. We analyzed 26 specimens of M. fascicularis, representing a full developmental spectrum. The temporalis, superficial masseter, and deep masseter were dissected to determine muscle mass, fiber length, and physiologic cross-sectional area (PCSA). Lever-arm lengths were also measured for each muscle, alongside the height of the temporomandibular joint (TMJ) and basicranial length. These variables were scaled against two biomechanical variables (jaw length and condyle-molar length) to determine relative developmental changes within these parameters. During ontogeny, muscle mass, fiber length, and PCSA scaled with positive allometry relative to jaw length and c...Continue Reading

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Citations

Sep 12, 2019·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Kaitlyn C LeonardAdam Hartstone-Rose
Aug 18, 2020·American Journal of Physical Anthropology·Hyunwoo JungNoreen von Cramon-Taubadel
Jan 24, 2021·Scientific Reports·Kaitlyn C LeonardAdam Hartstone-Rose
Sep 11, 2021·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Edwin DickinsonAdam Hartstone-Rose

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