Reticulorumen
5456809
200325253
2008-03-23T16:50:38Z
Lisatwo
4460024
Disambiguate [[Papillae]] to [[wiktionary:Papillae]] using [[:en:Wikipedia:Tools/Navigation_popups|popups]]
The '''reticulorumen''' represents the first chamber in the [[alimentary canal]] of [[ruminant]] animals. It is composed of the [[rumen]] and [[reticulum (anatomy)|reticulum]]. The reticulum differs from the rumen with regard to the texture of its lining. The rumen wall is covered in small finger like projections called [[wiktionary:Papillae|papillae]], which are flattened, approximately 0.5 cm in length and 0.3 cm wide in cattle. The reticulum is lined with ridges that form a [[hexagonal]] [[honeycomb]] pattern. The ridges are approximately 0.1 - 0.2 mm wide and are raised 0.5 cm above the reticulum wall. The hexagons in the reticulum are approximately 2-5 cm wide in cattle. Despite the differences in the texture of the lining of the two parts of the reticulorumen, it represents one functional space. [[Microbial fermentation]] degrades ingested [[carbohydrates]] in the reticulorumen to the [[volatile fatty acids]] [[acetate]], [[propionate]] and [[butyrate]], and [[proteins]] to short [[peptides]], [[amino acids]] and [[ammonia]]. This fermentation is anaerobic and allows the microbes in the reticulorumen to derive the [[energy]] and [[amino nitrogen]] in order that they can reproduce. Ruminants absorb the volatile fatty acids across the reticulorumen wall and use them for energy, while the microbes eventually flow out of the rumen into the remainder of the alimentary canal, where they are eventually digested and absorbed. The reticulum, at approximately 5-20 litres, is considerably smaller in capacity than the rumen, which is approximately 100-200 litres in cattle. The [[oesophageal groove]], which links the [[oesophagus]] and the [[omasum]] is located in the reticulum.
{{even-toed-ungulate-stub}}
[[Category:Animal anatomy]]
[[fr:Réticulo-rumen]]