Comparative morphology and evolution of cheek pouches in rodents

  title={Comparative morphology and evolution of cheek pouches in rodents},
  author={James M. Ryan},
  journal={Journal of Morphology},
  • 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… 

Epithelial behaviors and threshold effects in the development and evolution of internal and external cheek pouches in rodents

Differences in the epithelial eva inations that produce the internal pouches of the Syrian hamster and least ckipmunk are consistent with the view that they evolved independently.

Derived muscle arrangements and their shared innervation patterns of external and internal cheek pouches in rodents

Cheek pouches have evolved from the oral cavity in rodents and act as temporary food storage repositories. There are two types of opening, internal and external. Details about the complex cutaneous

Cranial Anatomy of Csakvaromys bredai (Rodentia, Sciuridae, Xerinae) and Implications for Ground Squirrel Evolution and Systematics

The craniofacial anatomy of an early marmotine ground squirrel Csakvaromys bredai reveals that C. bredai was a frugivore with a predominantly hard-nut diet and arboreal or semi-arboreal habit.

Muscle spindles in the rhesus monkey platysma

The investigation showed that the muscle fiber morphology was comparable in both parts of the platysma of the rhesus monkey, and it is tempting to speculate that they sense the filling of the cheek pouch rather than mimic activities.

The geographical distribution of rodent granivory and cheek pouches across North America

One of the specializations that many granivorous rodents exhibit to increase their efficiency in harvesting seeds is cheek pouches. We propose that the presence or absence of cheek pouches is related


  • P. BrylskiB. Hall
  • Biology, Psychology
    Evolution; international journal of organic evolution
  • 1988
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Kinematic analysis of an appetitive food-handling behavior: the functional morphology of Syrian hamster cheek pouches

Comparison of pouching and mastication in the same individuals suggests that in Syrian hamsters, feeding jaw cycles are modulated to accommodate pouch filling primarily by the addition of a pause between fast open and fast close phases, which is called `gape phase'.



Superficial Facial Musculature of Aplodontia

A large slip of trapezius is involved with the platysma in Aplodontia, a relationship interpreted as struc- tural preadaptation for the formation of certain sorts of cheekpouch retractor muscles found in other rodents.

The cheek pouches of Richardson's groundsquirrel, citellus richardsonii, sabine

The lips of the animal are modified in relation to the act of passing seeds into the sac, and the epithelial lining of the sac attains a degree of complexity comparable to the epidermis of the skin, except that a stratum lucidum and stratum granulosum are not developed.

Superordinal and Intraordinal Affinities of Rodents: Developmental Evidence from the Dentition and Placentation

The origin and subsequent evolutionary radiation of the order Rodentia were based primarily on the development of a pair of enlarged, evergrowing incisors in both jaws, and concomitant

Evolution of Mammalian Cheek Pouches and a Possibly Discontinuous Origin of a Higher Taxon (Geomyoidea)

The following account on the hypothetical origin of a key character seen in two families of rodents seems to suggest a macroevolutionary origin (in Van Valen's "conventional" sense).

The development of the syrian hamster cheek pouch

A detailed account of the morphogenesis and early cytodifferentiation of the hamster cheek pouch is provided and the ultrastructure of the cheek pouch epithelium closely resembles that of the adult.

Growth and development of Dipodomys stephensi.

The growth and development of 16 young from six litters of the kangaroo rat, Dipodomys stephensi, are described in detail from birth to 63 days, with the conclusion that growth rates are more conveniently described by smooth curves constructed from instantaneous growth-rate values computed for short-time intervals.

Systematic Value of the Carotid Arterial Pattern in Rodents

The only important early description of the cephalic arterial system in mammals is that of Tandler (1899), and it has been found that the pattern of carotid circulation may serve as a character complex of taxonomic importance.

Long-term organ culture of hamster cheek pouch mucosa.

Explants of cheek pouch mucosa from 12- to 48-hour-old hamsters have been maintained in organ culture for up to 49 days with excellent preservation of tissue integrity and relationships. The