The Forearm Musculature of the Gray Mouse Lemur (Microcebus murinus): An Ontogenetic Study.
PCSA
aging
arboreality
development
fascicle length
grip strength
senescence
Journal
Anatomical record (Hoboken, N.J. : 2007)
ISSN: 1932-8494
Titre abrégé: Anat Rec (Hoboken)
Pays: United States
ID NLM: 101292775
Informations de publication
Date de publication:
05 2020
05 2020
Historique:
received:
22
05
2019
revised:
03
07
2019
accepted:
07
07
2019
pubmed:
12
9
2019
medline:
17
2
2021
entrez:
12
9
2019
Statut:
ppublish
Résumé
Although studies have sought to characterize variation in forearm muscular anatomy across the primate order, none have attempted to quantify ontogenetic changes in forearm myology within a single taxon. Herein, we present muscle architecture data for the forearm musculature (flexors and extensors of the wrist and digits) of Microcebus murinus, a small Lemuroid that has been the focus of several developmental studies. A quadratic curvilinear model described ontogenetic changes in muscle mass and fascicle length; however, fascicle lengths reached peak levels at an earlier age and showed a stronger decline during senescence. Conversely, physiological cross-sectional area followed a more linear trend, increasing steadily throughout life. As previous studies into the functional role of the primate forelimb emphasize the importance of long muscle fascicles within arboreal taxa in order to maximize mobility and flexibility, the early attainment of peak fascicle lengths may consequently reflect the importance of agility within this mobile and highly arboreal species. Similarly, observed myological trends in forearm strength are supported by previous in vivo data on grip strength within M. murinus in which senescent individuals showed no decline in forearm force relative to prime age individuals. This trend is interpreted to reflect compensation for the previously reported decline in hind limb grip strength in the hind limb with age, such that older individuals are able to maintain arboreal stability. Interestingly, the ontogenetic trajectory of each architectural variable mirrored previous observations of the masticatory musculature in M. murinus, suggesting that ontogenetic trends are relatively conserved between anatomical regions. Anat Rec, 303:1354-1363, 2020. © 2019 American Association for Anatomy.
Types de publication
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
1354-1363Informations de copyright
© 2019 American Association for Anatomy.
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