Rumen Flashcards

1
Q

What are the 4 muscle layers of the bovine abdomen?

A

1) cutaneous trunci
2) external abdominal oblique (cranio-ventral)
3) internal abdominal oblique (caudo-ventral)
4) transverse abdominus and rectus abdominus

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2
Q

What are 3 reasons by the paralumbar fossa is clinically relevant?

A

External palpation
Rumen auscultation
Incision site

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3
Q

What do dermatomes innervate?

A

Skin (peritoneum zones)

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4
Q

What does the “fore stomach” all include? And what are they all lined with?

A

Reticulum, rumen, and omasum. Lined by non-glandular mucosa with stratified squamous epithelium

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5
Q

What are the cranial and caudal extensions of the rumen (what is its neighbour on each side)?

A

Diaphragm cranially and the pelvic inlet caudally

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6
Q

What are two ways to palpate the rumen?

A

Left paralumbar fossa
Transrectal

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7
Q

At what rib does the ruminant stomach start?

A

The 7th rib

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8
Q

What compartment of the rumen lies right up against the diaphragm?

A

The reticulum

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9
Q

On what side does the omasum sit?

A

On the right side

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10
Q

What are the boundaries of the paralumbar fossa?

A

Caudally - tuber coxae
Dorsally - transverse processes of lumbar vertebrae
Cranioventrally - caudal edge of the 13th rib

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11
Q

What spinal nerves are involved in paravertebral anesthesia of the paralumbar fossa and abdominal wall?

A

T13, L1, L2

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12
Q

What 4 blocks are involved in paravertebral anesthesia of the paralumbar fossa and abdominal wall?

A

Spinal nerves T13, L1, L2
Proximal paravertebral block
Distal paravertebral block
Intertransverse ligament

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13
Q

What opening is at the junction of rumen and reticulum and empties into both?

A

Cardiac opening

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14
Q

What is the continuous opening between the rumen and reticulum?

A

Ruminoreticular opening

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15
Q

What sac in the rumen has well-developed, long papillae?

A

Ventral sac

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16
Q

What sac in the rumen has not developed and short papillae?

A

Dorsal sac and pillars

17
Q

What are ruminal papillae?

A

Soft tissue formations of the lamina propria and submucosa

18
Q

What part of the rumen has a honeycomb lining?

A

Reticulum

19
Q

What has muscular lips on each side and is very important in neonates to allow milk to bypass the rumen?

A

Reticular groove

20
Q

What are the 2 openings of the omasum, and what connects them?

A

Reticulo-omasal orifice and omasoabomasal orifice connected by omasal canal

21
Q

What is the layman’s term for the omasum?

A

Butchers bible because it looks like pages in a book

22
Q

What compartment of the rumen has glandular mucosa and permanent folds?

A

Abomasum

23
Q

What directions of the greater and lesser curvatures of the abomasum face?

A

Greater curvature faces ventrally
Lesser curvature faces dorsally

24
Q

Where are the gastric glands located in the abomasum? And where are the mucous glands?

A

Fundus and body for gastric glands and mucous glands in the pylorus

25
Q

What acts as a ball valve regulating flow?

A

Torus pyloricus

26
Q

Which is more severe and LDA or an RDA?

A

RDA

27
Q

What portions of the rumen are associated with the lesser omentum?

A

Omasum and abomasum

28
Q

What parts of the rumen are associated with the greater omentum?

A

Rumen, reticulum, and abomasum

29
Q

What is a skirt-like sling that contains the intestinal mass and formed by the greater omentum?

A

Supraomental recess

30
Q

What is formed by the greater and superficial leaves of the greater omentum and contains the ventral sac of the rumen?

A

Omental bursa

31
Q

What is the main arterial blood supply of the rumen, and what are the 3 branches?

A

Celiac artery - splenic artery, left gastric artery, hepatic artery

32
Q

What is the venous blood supply of the rumen?

A

Gastric and splenic veins join and open into the portal vein

33
Q

What does the dorsal vagus innervate?

A

Rumen, reticular groove, omasum and abomasum

34
Q

What does the ventral vagus nerve innervate?

A

Primarily reticulum, omasum, and abomasum

35
Q

What side of the midline does the intestinal mass sit, what is it suspended by, and what does it lie within?

A

Sits to the right of the midline, suspended by the great mesentery, and lies within the supra-omental recess

36
Q

What is a non-sacculated, blind-ended, and featureless sac that projects caudally from the supraomental recess?

A

Cecum

37
Q

What segment of the ascending Colon has a sigmoid flex ire as it leaves the cecum?

A

Proximal segment

38
Q

What attaches the descending colon to the ascending duodenum?

A

Duodneo-colic ligament