Lab 6: Ruminant Stomach and GI Tract Flashcards
What does the ventral coronary pillar delineate?
Opening of the caudoventral blind sac
What does the dorsal coronary pillar delineate?
opening of the caudodorsal blind sac
What groove corresponds to the caudal pillar?
caudal groove
What grooves correspond to the R and L longitudinal pillars?
R and L longitudinal grooves
What groove corresponds to the cranial pillar?
Cranial groove
Where does the superficial leaf of the greater omentum attach?
Along L longitudinal groove, caudal groove, and R longitudinal groove
Where does the deep leaf of the greater omentum attach?
R longitudinal groove
space between the superficial and deep leaves of the greater omentum
omental bursa
What is the continuation of the reticular groove through the omasum called?
the omasal groove (through the omasal canal)
The entire liver is located on what side of the cow?
R side
what lies in the supraomental bursa?
The intestinal mass
Do cows have a gall bladder?
yes. Present on the visceral surface of the liver
What artery lies in the cranial groove? ***
L ruminal a.
What grooves does the R ruminal a. lie in? ***
R longitudinal and caudal grooves
Where is the reticular artery located? ***
On the L side of the cardia and dorsal aspect of the reticulum
What does the ruminoreticular fold delineate?
cranial sac of the rumen from the reticulum at the ruminoreticular orifice
area where esophagus opens to the reticulum is known as:
cardia
what structure makes up the honeycomb appearance of the mucosa?
reticular crests
2 functions of ruminal papillae *****
1) increase surface area
2) absorb volatile fatty acids (VFAs)
what does the reticulo-omasal orifice lead to?
omasum
what does the omasoabomasal orifice lead to?
abomasum
What drains into the major duodenal papilla in the cow?
common bile duct
what is the torus pyloricus composed of and what is its function? ***
a mound composed of smooth muscle, erectile tissue, and fat between the abomasum and duodenum. functions to help close off the pylorus.
What drains into minor duodenal papilla in the cow? ***
accessory pancreatic duct. This duct is the more functional (and usually the only) duct from the pancreas in cattle
where does the apex of the cecum normally lie in the cow?
at the pelvic inlet
sigmoid colon
curvature in distal part of rectum that is utilized in rectal palpation
where ileum meets large intestine is known as:
cecocolic junction (through the ileal junction)
3 parts of ascending colon in the cow
proximal loop, spiral loop, distal loop
Where can the spiral loop of the ascending colon in the cow be visualized in situ?
L side behind the rumen
Where does distal loop of ascending colon lie in situ?
From connection with spiral loop, passes caudally a short distance where it abruptly turns ventrally at lvl of 5th lumbar vertebra and cranially along the R side of the mesentery
centripetal vs. centrifugal flow in the spiral loop of the ascending colon **
The initial segment of the spiral loop is arranged into “centripetal” turns (infow) until the central flexure where the direction of the turns become “centrifugal” (outflow) and eventually spirals out to the distal loop.
