<p>Although there have been several published reports of big cat muscular dissections, few focus on highlighting origins and insertions. While muscle dissection images can be useful, without mapped muscle attachments, it is difficult to ascertain the exact placement of the muscles and the possible differences between taxa. Here, we dissect the hindlimbs of an Amur tiger (<i>Panthera tigris altaica</i>) to better understand muscular morphology of this species. One of our goals in this dissection was to make muscle maps of origins and insertions for use in paleontological reconstructions of closely related extinct taxa. As in the forelimb, hindlimb muscular morphology seems to be relatively conserved in the tiger compared to other large cats, however, there are some differences from other felids such as m. vastus lateralis having two heads of origin and the presence of two muscles associated with abduction of the fifth digit. Differences are also present between the left and right hindlimbs, suggesting the presence of intraspecific variation. Our results indicate that larger felids have relatively larger muscles involved in ankle inversion and hindlimbs and forelimbs that are more equal in size than smaller felids. Among the cats in our sample, we find that hindlimb muscles are typically larger than the forelimb muscles at homologous joints except for digital flexors and extensors. We find no significant differences in muscle mass between felids with different locomotor categories or prey preferences, however, this may be due to small sample sizes, which make it difficult to draw robust statistical conclusions.&#xa0;</p>

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Muscular anatomy of the hindlimb of the tiger (Panthera tigris)

  • Rachel H. Dunn,
  • Anthony Hotchner,
  • Ariel Gubatina,
  • Sidney Steiner,
  • Ben Witt,
  • Kathleen Bitterman,
  • Julie A. Meachen

摘要

Although there have been several published reports of big cat muscular dissections, few focus on highlighting origins and insertions. While muscle dissection images can be useful, without mapped muscle attachments, it is difficult to ascertain the exact placement of the muscles and the possible differences between taxa. Here, we dissect the hindlimbs of an Amur tiger (Panthera tigris altaica) to better understand muscular morphology of this species. One of our goals in this dissection was to make muscle maps of origins and insertions for use in paleontological reconstructions of closely related extinct taxa. As in the forelimb, hindlimb muscular morphology seems to be relatively conserved in the tiger compared to other large cats, however, there are some differences from other felids such as m. vastus lateralis having two heads of origin and the presence of two muscles associated with abduction of the fifth digit. Differences are also present between the left and right hindlimbs, suggesting the presence of intraspecific variation. Our results indicate that larger felids have relatively larger muscles involved in ankle inversion and hindlimbs and forelimbs that are more equal in size than smaller felids. Among the cats in our sample, we find that hindlimb muscles are typically larger than the forelimb muscles at homologous joints except for digital flexors and extensors. We find no significant differences in muscle mass between felids with different locomotor categories or prey preferences, however, this may be due to small sample sizes, which make it difficult to draw robust statistical conclusions.