Comparative morphology and evolution of cheek pouches in rodents

@article{Ryan1986ComparativeMA,
  title={Comparative morphology and evolution of cheek pouches in rodents},
  author={James M. Ryan},
  journal={Journal of Morphology},
  year={1986},
  volume={190}
}
  • J. M. Ryan
  • Published 1 October 1986
  • Biology
  • Journal of Morphology
There are two types of cheek pouches in extant rodents. Internal cheek pouches are evaginations of the oral cavity deep to M. platysma and M. sphincter colli profundus, and have evolved independently in some species of the superfamilies Sciuroidea and Muroidea. External, furlined cheek pouches open lateral to and separate from the oral cavity, (also deep to M. platysma and M. sphincter colli profundus), and occur in all species of the families Geomyidae and Heteromyidae. The presence of… 

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