The colonic separation mechanism in the guinea-pig (Cavia porcellus) and the chinchilla (Chinchilla laniger)

Holtenius, K.; Björnhag, Göran

doi:10.1016/0300-9629(85)90429-3

Cited by 52 publications

(44 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The findings of our study show that the anatomical and histological organization of the colonic groove or furrow in several African mole-rat species have similarities to that reported in guinea pigs and chinchilla (Holtenius and Björnhag, 1985). In both instances, an abundance of mucinsecreting goblet cells was observed in the mucosa covering both the luminal and groove sides of the colonic grooves.…”

Section: Discussionsupporting

confidence: 73%

“…Two types of CSM have been described in the literature and reviewed by Cork et al (1999), namely the ''wash-back'' type first noted in rabbits (Björnhag, 1981) and the ''mucous-trap-type'' as observed in the guinea pig and chinchilla (Holtenius and Björnhag, 1985). The ''wash-back'' CSM entails a series of retroperistaltic contractions of the haustra, which transports bacteria-rich fluid digesta to the cecum.…”

Section: Discussionmentioning

confidence: 96%

“…The ''wash-back'' CSM entails a series of retroperistaltic contractions of the haustra, which transports bacteria-rich fluid digesta to the cecum. The mucous-type CSM is present in the ascending colon where a groove or furrow is used as a route for retrograde transport of a mixture of bacteria and mucous (Holtenius and Björnhag, 1985).…”

Section: Discussionmentioning

confidence: 99%

“…In a comprehensive compara-tive rodent gastrointestinal anatomical study, Gorgas (1967) observes two longitudinally arranged folds in the proximal colon forming a groove in various caviomorph and hystricomorphic rodents. A colonic mucosal furrow or groove was also later described in the nutria (Snipes et al, 1988;Takahashi and Sakaguchi, 2000), chinchilla and guinea pig (Holtenius and Björnhag, 1985), and the Patagonian mara (Gorgas, 1967;Weissengruber, 2000). Within the wall of the groove of the latter species, Gorgas (1967) reports prominent venous sinusoids which he postulates, upon filling, may compartmentalize the colonic lumen.…”

Section: Introductionmentioning

confidence: 91%

See 3 more Smart Citations

The colonic groove or furrow: A comparative morphological study of six species of African mole‐rats (Rodentia, Bathyergidae)

Kotzé

Merwe

Ndou

et al. 2009

Journal of Morphology

View full text Add to dashboard Cite

Herbivorous mammals such as nutrias, guinea pigs, chinchillas, and mole-rats have a longitudinal mucosal colonic groove (furrow) in their ascending colon, which is thought to play a role in the colonic separation mechanism (CSM). It is not known whether this groove is structurally modified to adapt to this function in mole-rat species. The morphology of this groove was studied in 32 mol-rats, four species, one of which consisted of three subspecies, endemic to southern Africa and two species found in eastern Africa. The macroscopic morphology of the groove was documented, and samples for histological examination were taken. The groove was wide at its origin at the cecocolic junction and was lined on either side by a row of papillae with the opposing papillae slightly offset in arrangement. The papillated groove gradually decreased in size toward the distal part of the ascending colon where it disappeared. This pattern was similar in all species except in Heterocephalus glaber, where the papillae were absent and the groove was lined by two longitudinal ridges. A histological examination of cross sections revealed that the mucosa covering the inner and outer walls of the groove was rich in mucous-secreting goblet cells. The walls of the groove contained smooth muscle extending from the inner circular smooth muscle layer at the base to the tips of the papillae in all species examined as well as arteries, lymphatic vessels, and prominent sinusoid-like veins. The groove could be demonstrated both macroscopically and histologically in three Bathyergus suillus fetuses of varying sizes. The sinusoid-like veins present in all grooves, regardless of macroscopic shape, suggest that they have a role in the functioning of the groove.

show abstract

Section: Discussionsupporting

confidence: 73%

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

See 2 more Smart Citations

The colonic groove or furrow: A comparative morphological study of six species of African mole‐rats (Rodentia, Bathyergidae)

Kotzé

Merwe

Ndou

et al. 2009

Journal of Morphology

View full text Add to dashboard Cite

show abstract

“…Chilean chinchillas urinate and defecate on rocks, forming latrines that advertise their presence (Jimenez 1990b). Domestic animals defecate between 0300 and 0600 h, and consume cecotropes between 0800 and 1400 h (Holtenius and Bjornhag 1985). When eating, Chilean chinchillas sit erect and hold food in their forepaws.…”

Section: Animal Husbandrymentioning

confidence: 99%

Chinchilla laniger

et al. 2004

View full text Add to dashboard Cite

The comparative anatomy of the abdominal gastrointestinal tract of six species of African mole‐rats (Rodentia, Bathyergidae)

Kotzé

Merwe

Bennett

et al. 2009

Journal of Morphology

View full text Add to dashboard Cite

The gastrointestinal tracts (GITs) of six species of African mole-rats (Bathyergidae) were compared. The aim was to provide a comprehensive anatomical comparison between the different species. The relative shape, length, and surface areas were taken into account to determine whether the GITs are phylogenetically constrained or exhibit anatomical adaptations in response to diets. In all six species the stomach was simple and glandular. With the exception of Heterocephalus glaber, the caecum was coiled in a flat spiral, the ascending colon was arranged in a loop of varying lengths, and a mucosal colonic papillary-lined groove was present in the ascending colon in all species. By contrast, the caecum in H. glaber was uncoiled, the ascending colon was not looped, and the groove was not papillated. A caeco-appendix was observed only in Bathyergus suillus and Georychus capensis. Hierarchical multivariate cluster analysis on the presence/absence of nine anatomical structures associated with the GIT of mole-rats revealed that H. glaber was anatomically the least similar of the six species (77.6% similarity) with respect to the nine GIT variables included. All Cryptomys species were the same (100% similarity), and two species B. suillus and G. capensis grouped together and were more similar to the Cryptomys genus (95% similarity) than they were to H. glaber. These findings support previous phylogenetic classifications. The voluminous caeco-colon in B. suillus may be explained by its ingestion of grasses in addition to below-ground storage organs of plants. We conclude that phylogeny and diet affect the GIT anatomy of the African mole rats studied here.

show abstract

The colonic separation mechanism in the guinea-pig (Cavia porcellus) and the chinchilla (Chinchilla laniger)

Cited by 52 publications

References 8 publications

The colonic groove or furrow: A comparative morphological study of six species of African mole‐rats (Rodentia, Bathyergidae)

The colonic groove or furrow: A comparative morphological study of six species of African mole‐rats (Rodentia, Bathyergidae)

Chinchilla laniger

The comparative anatomy of the abdominal gastrointestinal tract of six species of African mole‐rats (Rodentia, Bathyergidae)

Contact Info

Product

Resources

About