Leaf stomach
The omasum ( lat. Omasum even book ( stomach ), Psalter , calendar or solver called) is a division of the rumen of ruminants . It lies as a balloon-like structure on the right side in the anterior abdominal cavity and borders the liver , reticulum and abomasum . In cattle , it is about the size of a medicine ball . It owes its name to the approximately 100 folds of the mucous membrane ( laminae omasi ) formed inside , which look like the leaves of a book .
function
The food fermented in the rumen reaches the leaf stomach via the reticulum and the ostium reticulo-omasicum . The psalter leaves have short, keratinized protuberances ( papillae omasi ). In the narrow gaps between the psaltery leaves (recessus interlaminares ), the internal motor skills of the leaf stomach (psaltery contractions) squeeze fluid out of the mash and thicken the latter. In addition, water and water-soluble food components are absorbed in the leaf stomach, which means that this part of the stomach has a relatively firm consistency. The now more thickened food arrives through the contractions of the leaf stomach via the ostium omasoabomasicum in the actual glandular stomach of the ruminants , the abomasum .
Diseases
Occasionally, excessive thickening and impaired motor skills lead to a blockage of the leaf stomach. Sanding up heavily soiled forage is also possible. Both of these lead to severe digestive disorders that can be fatal without treatment by the veterinarian.
literature
- Franz-Viktor Salomon: stomach, ventriculus (gaster). In: Salomon u. a. (Ed.): Anatomy for veterinary medicine . 2nd ext. Edition. Enke-Verlag, Stuttgart 2008, ISBN 978-3-8304-1075-1 , pp. 272-293.
