Ruminants GI Part 2 Flashcards
Where is the omasum located?
Right side, 8th to 11th ribs
Between liver and abomasum
Covered by lesser omentum
What is the function of the omasum?
Pump to move ingesta from reticulum to abomasum
What are the other names for the omasum?
Manypiles or Butcher bible
Abomasum
AKA “The Rennet”
Non palpable
Glandular part of the stomach
What is the location of the abomasum?
Right, 8-12th ribs
Attached by the lesser or greater omentum
Floor of the abdomen
How the the superficial leaf of the omentum run?
- Left side of abomasum @ left longitudinal groove
- Goes right @ greater curvature
- @ descending duodenum it reflect to become the deep leaf
- Inserts on the right longitudinal of the rumen
What is the structure of the abomasum?
Spiral folds mucosa
Torus plyloricus (lump tissue)
Vela abomasica (valve like protusion)
Left displaced abomasal
Usually in dairy cows and late pregnancy (low roughage diet)
Most of the displacement cases (85-96%)
Abomasum moves left and is trapped between the rumen and left abdominal wall
How do you diagnose LDA?
Simultaneous percussion and auscultation along line between 9th and 13th ribs (left)
Pig sound @ 11th ICS
How do you fix LDA?
- Laprotomy/ Celiotomy on the right cutting EOA, IOA and transverse abdominis muscles
- Deflate abomasum
- Pull to og spot
- Pyloropexy
Pyloropexy
Suturing the pyloric part of the abomasum to the transverse abdominis muscle
Right Displaced Abomasal
Abomasum moves dorsally to middle of the abdomen
If not resolved it’ll rotate on mesenteric/ longitudinal axis –> volvulus
Volvulus
Cuts blood supply and drainage of portal vein
What is the order of the ruminant GI tract?
Rumen –> reticulum –> omasum –> abomasum –> pyloric part fo the abomasum –> sigmoid flexure of the duodenum –> descending duodenum –> caudal duodenal flexure –> ascending duodenum (with duodenal colic fold) –> jejunum (with mesenteric LN) –> ileum –> cecum (with ilio cecal fold) –> proximal loop of the ascending colon –> spiral colon (centripetal, central flexure, centrifugal) –> distal loop of the ascending colon –> transverse colon –> small colon
Within the duodenum, what structure is absent in small ruminants?
Minor papillae