Lab 5: Abdomen Flashcards
3 tubular structures entering the ventro-medial (visceral) surface of the liver. Which will have the widest lumen?
hepatic artery, portal vein, bile duct. Portal vein has widest lumen
name the opening the esophagus passes through in the diaphragm
esophageal hiatus
Does horse have a gall bladder?
NO
Which organs/structures leave impressions on the liver? (6)
stomach, esophagus, descending duodenum, R kidney, caudal vena cava, R dorsal ascending colon
Compare the epithelium of the blind sac of the stomach vs. the distal stomach
blind sac: whitish, non-glandular, stratified squamous epithelium
distal stomach: pink, glandular
Border between blind sac and distal stomach
margo plicatus
what prevents the horse from vomiting?
the thick cardiac sphincter. Horse can only vomit in severe cases
What drains into the major duodenal papilla in the horse?
Bile duct and pancreatic duct
What drains into the minor duodenal papilla in the horse?
Accessory pancreatic duct
What part of colon passes cranial to the root of the mesentery?
transverse colon
From what side does ileum enter the cecum?
from the medial side
What direction does the cecocolic orifice face?
caudally into the R ventral colon
Why is it important to know pattern of bands and sacculations in the horse?
For identification in abdominal surgery and rectal palpation
Which segment(s) of the colon have distinct sacculations?
R ventral colon, L ventral colon, small colon
Which segment(s) of the colon have no sacculations?
L dorsal colon
Which segment(s) of the colon have indistinct sacculations?
R dorsal colon
How many free and hidden bands does the R ventral colon have?
2 free, 2 hidden (same as the L ventral colon)
How many free and hidden bands does the R dorsal colon have?
2 free, 1 hidden
How many free and hidden bands does the L dorsal colon have?
0 free, 1 hidden
How many free and hidden bands does the L ventral colon have?
2 free, 2 hidden. (same as R ventral colon)
How many free and hidden bands does the small colon have?
1 free, 1 hidden
Does the cecum have bands and/or sacculations?
Yes-both
What does the colic branch of the ileocolic artery supply?
ventral coli
What does the R colic a. supply?
dorsal coli
Where doe the colic br. of ileocolic a. and R colic a. anastomose?
pelvic flexure
Why are colic conditions exacerbated by ischemia at the pelvic flexure?
This is the location where the R colic a. and colic br. of the ileocolic a. anastomose and end, so it is more susceptible to ischemia
What is the peritoneal cavity lined by?
parietal peritoneum
What muscle lies directly ventral to the parietal peritoneum, fascia, and fat?
Rectus abdominis
How many lumbar vertebrae are normally in the horse? What about Arabians?
6 normally, Arabians usually have 5
How many bones fuse to form sacrum in horse?
5 sacral vertebrae
Avg. number of caudal (coccygeal) vertebrae in horse
18
whats another term for sacculations?
haustra
what is another term for the longitudinal smooth muscle bands located on the large and small colon?
teniae coli
