Ruminant Digestive I (17) Flashcards
Dr. Center
In the ruminant, what are the muscles of the abdominal wall from superficial to deep?
cutaneous trunci m.
external abdominal oblique m.
internal abdominal oblique m.
transversus abdominus m.
rectus abdominus m.
Besides the cutaneous trunci m., what is the most superficial muscle of the flank in the ruminant?
external abdominal oblique m.
External abdominal oblique m. fibers run which direction?
caudoventrally — to the linea alba
the most dorsal fibers will appear to run horizontally to the coxal tuber
Where does the external abdominal oblique m. arise from?
caudal aspect of the last 8 ribs (so, 13-8 = ribs 5-13?)
What muscle is directly deep to the external abdominal oblique m.?
internal abdominal oblique m.
Internal abdominal oblique m. fibers run which direction?
cranioventrally
Fibers of the internal abdominal oblique m. arise from the _______ and ________ of the ________
coxal tuber
pelvic tendon
external abdominal oblique m.
Where do internal abdominal oblique muscle fibers insert?
on the last rib and linea alba
Where does the transversus abdominis arise and insert?
arises from the last rib and the extremities of the lumbar transverse processes
inserts into an aponeurosis immediately dorsal to the rectus to join the linea alba, forming the inner rectus sheath
Transversus abdominus m. fibers run which direction?
dorsoventral
What does the rectus abdominis m. arise from?
the ventral surface of the last 10 ribs and travels caudally to pubic brim
In the ruminant, what are the most important nerves supplying the abdominal wall?
T13
L1
L2
gives complete block of abdominal wall
Each nerve is composed of a _____ and _____ branch
dorsal
ventral
Which direction do nerves run in relation to the lumbar transverse processes? How can you use the relative position of the nerves to your advantage for surgery?
caudoventrally
can palpate transverse processes - act as a great landmark
In the ruminant abdomen, the _____ takes up the majority of the left side
rumen
Label 1-5 parts of the rumen
- atrium ruminis
- dorsal sac of rumen
- caudodorsal blind sac
- caudoventral blind sac
- ventral sac of rumen
What is the “entryway” of the rumen?
atrium ruminis
What structures can be visualized on the right ruminant abdomen?
omasum
greater omentum
abomasum
descending duodenum
liver
Label 1-4 of the right ruminant abdomen
- greater omentum
- omasum (covered by lesser omentum)
- abomasum
- pyloric part of abomasum
Which structure of the ruminant abdomen is up more cranially and therefore harder to rectally palpate?
reticulum
Where does the rumen extend?
from the cardia (half way up to the 8th rib) to the pelvic inlet
from the floor of the abdomen to the ceiling
T/F: The rumen does not go past the midline, staying primarily on the left side
FALSE - stretches over to the midline, especially caudally and ventrally to the right flank
The rumen fills the entire [right/left] side
left