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Fiber type composition of epaxial muscles is geared toward facilitating rapid spinal extension in the leaper Galago senegalensis.

Publication ,  Conference
Huq, E; Taylor, AB; Su, Z; Wall, CE
Published in: Am J Phys Anthropol
May 2018

OBJECTIVES: We hypothesized that the vertical leaper Galago senegalensis will have epaxial extensor muscles with a fast fiber phenotype to facilitate rapid spinal extension during leaping in comparison to the slow-moving quadruped Nycticebus coucang. To test this, we determined the percentage of fiber cross-sectional area (%CSA) devoted to Type 2 fibers in epaxial muscles of G. senegalensis compared to those of N. coucang. MATERIALS AND METHODS: Immunohistochemistry was used to identify Type 1, Type 2, and hybrid fibers in iliocostalis, longissimus, and multifidus muscles of G. senegalensis (n = 3) and N. coucang (n = 3). Serial muscle sections were used to estimate and compare proportions, cross-sectional areas (CSAs), and %CSAs of Type 1, Type 2, and hybrid fibers between species. RESULTS: Epaxial muscles of G. senegalensis were comprised predominantly of Type 2 fibers with large CSAs (%CSA range ≈ 83-94%; range of mean CSA = 1,218-1,586 μm2 ). N. coucang epaxial muscles were comprised predominantly Type 1 fibers with large CSAs (%CSA range ≈ 69-77%; range of mean CSA = 983-1,220 μm2 ). DISCUSSION: The predominance of Type 2 fibers in G. senegalensis epaxial muscles facilitates rapid muscle excursion and spinal extension during leaping, and is consistent with their relatively long muscle fibers. The predominance of Type 1 fibers in N. coucang epaxial muscles may aid in maintaining stable postures during bridging and cantilevering behaviors characteristic of slow-climbing. These histochemical characteristics highlight the major divergent locomotor repertoires of G. senegalensis and N. coucang.

Duke Scholars

Published In

Am J Phys Anthropol

DOI

EISSN

1096-8644

Publication Date

May 2018

Volume

166

Issue

1

Start / End Page

95 / 106

Location

United States

Related Subject Headings

  • Muscle, Skeletal
  • Muscle Fibers, Skeletal
  • Male
  • Lorisidae
  • Galago
  • Female
  • Anthropology, Physical
  • Anthropology
  • Animals
  • 4401 Anthropology
 

Citation

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ICMJE
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Huq, E., Taylor, A. B., Su, Z., & Wall, C. E. (2018). Fiber type composition of epaxial muscles is geared toward facilitating rapid spinal extension in the leaper Galago senegalensis. In Am J Phys Anthropol (Vol. 166, pp. 95–106). United States. https://doi.org/10.1002/ajpa.23405
Huq, Emranul, Andrea B. Taylor, Zuowei Su, and Christine E. Wall. “Fiber type composition of epaxial muscles is geared toward facilitating rapid spinal extension in the leaper Galago senegalensis.” In Am J Phys Anthropol, 166:95–106, 2018. https://doi.org/10.1002/ajpa.23405.
Huq, Emranul, et al. “Fiber type composition of epaxial muscles is geared toward facilitating rapid spinal extension in the leaper Galago senegalensis.Am J Phys Anthropol, vol. 166, no. 1, 2018, pp. 95–106. Pubmed, doi:10.1002/ajpa.23405.
Journal cover image

Published In

Am J Phys Anthropol

DOI

EISSN

1096-8644

Publication Date

May 2018

Volume

166

Issue

1

Start / End Page

95 / 106

Location

United States

Related Subject Headings

  • Muscle, Skeletal
  • Muscle Fibers, Skeletal
  • Male
  • Lorisidae
  • Galago
  • Female
  • Anthropology, Physical
  • Anthropology
  • Animals
  • 4401 Anthropology