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Descriptor English: Omasum
Descriptor Spanish: Omaso
Descriptor omaso
Scope note: Tercer estómago de los rumiantes, situado en el lado derecho del abdomen, superior al cuarto estómago y entre este último y el segundo estómago, comunicándose con ambos. Desde su superficie interna se proyectan un gran número de hojas o folios, cada uno de los cuales posee una superficie rugosa. En el centro de cada folio hay una banda de fibras musculares que produce un movimiento de frotación de la hoja cuando se contrae. Una hoja se restriega contra las que están a cada lado de ella, y las partículas grandes de alimentos se trituran entre las superficies rugosas, lo que las prepara para una mayor digestión en las siguientes partes del tracto digestivo. (Black's Veterinary Dictionary, 17th ed)
Descriptor Portuguese: Omaso
Descriptor French: Feuillet
Entry term(s): Omasums
Tree number(s): A13.869.524
RDF Unique Identifier: https://id.nlm.nih.gov/mesh/D009851
Scope note: The third stomach of ruminants, situated on the right side of the abdomen at a higher level than the fourth stomach and between this latter and the second stomach, with both of which it communicates. From its inner surface project large numbers of leaves or folia, each of which possesses roughened surfaces. In the center of each folium is a band of muscle fibers which produces a rasping movement of the leaf when it contracts. One leaf rubs against those on either side of it, and large particles of food material are ground down between the rough surfaces, preparatory to further digestion in the succeeding parts of the alimentary canal. (Black's Veterinary Dictionary, 17th ed)
Annotation: a ruminant's 3d stomach; dis: coord IM with STOMACH DISEASES /vet (IM); neopl: coord IM with STOMACH NEOPLASMS /vet + histol type /vet (IM); ulcer: coord IM with STOMACH ULCER /vet (IM)
Allowable Qualifiers: AB abnormalities
AH anatomy & histology
BS blood supply
CH chemistry
CY cytology
DE drug effects
DG diagnostic imaging
EM embryology
EN enzymology
GD growth & development
IM immunology
IN injuries
IR innervation
ME metabolism
MI microbiology
PA pathology
PH physiology
PP physiopathology
PS parasitology
RE radiation effects
SU surgery
TR transplantation
UL ultrastructure
VI virology
Previous Indexing: Stomach (1966-1967)
Public MeSH Note: 68
History Note: 68
DeCS ID: 10036
Unique ID: D009851
Documents indexed in the Virtual Health Library (VHL): Click here to access the VHL documents
Date Established: 1968/01/01
Date of Entry: 1999/01/01
Revision Date: 2004/07/29
Omasum - Preferred
Concept UI M0015291
Scope note The third stomach of ruminants, situated on the right side of the abdomen at a higher level than the fourth stomach and between this latter and the second stomach, with both of which it communicates. From its inner surface project large numbers of leaves or folia, each of which possesses roughened surfaces. In the center of each folium is a band of muscle fibers which produces a rasping movement of the leaf when it contracts. One leaf rubs against those on either side of it, and large particles of food material are ground down between the rough surfaces, preparatory to further digestion in the succeeding parts of the alimentary canal. (Black's Veterinary Dictionary, 17th ed)
Preferred term Omasum
Entry term(s) Omasums



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