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ECVS Tobias > 93. Colon > Flashcards

93. Colon Flashcards

1
Q

Which artery supplies the proximal half of the descending colon?

A

B) Middle colic artery

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2
Q

In cats, the cecocolic orifice is located:

A

B) Adjacent to the ileocolic orifice

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3
Q

Which of the following structures tethers the descending colon to the ascending duodenum?

A

A) Duodenocolic ligament

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4
Q

Which portion of the colon is primarily involved in fecal storage?

A

D) Distal colon

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5
Q

Which cells are responsible for mucus secretion in the colon?

A

A) Goblet cells

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6
Q

In which species is the cecum short and comma-shaped?

A

B) Cats

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7
Q

Which of the following is the most common cause of feline megacolon?

A

B) Idiopathic

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8
Q

What is the primary function of short-chain fatty acids in the colon?

A

B) Absorb Na+ and Cl-

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9
Q

Which layer of the colon is most important for tensile strength during healing?

A

B) Submucosa

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10
Q

What is the recommended suture pattern for colonic anastomosis?

A

A) Simple interrupted

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11
Q

The mesocolon is shortest at the level of the right colic flexure.

A

False

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12
Q

The colonic epithelium is involved in both absorption and secretion functions.

A

True

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13
Q

Colonic transit is slower than that of the small intestine, allowing time for fecal mixing.

A

True

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14
Q

The left colic artery supplies the proximal portion of the transverse colon.

A

False

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15
Q

The colon of cats contains numerous aggregated lymphoid nodules similar to those in the small intestine.

A

False

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16
Q

A biofragmentable anastomosis ring provides an inverted wound with high bursting strength.

A

True

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17
Q

Fibrin glue has been shown to have consistently positive results for colonic sealing in veterinary patients.

A

False

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18
Q

Colonic mucosa is composed of columnar and cuboidal epithelial cells arranged in parallel crypts.

A

True

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19
Q

A major component of colonic secretion is K+ and bicarbonate (HCO3-).

A

True

20
Q

The cranial mesenteric artery supplies the majority of the colon.

A

False

21
Q

Describe the role of the vasa recta in colonic blood supply.

A

The vasa recta bifurcate and supply blood to the muscular and submucosal layers.

22
Q

What is the primary clinical sign of idiopathic megacolon in cats?

A

Severe constipation and obstipation.

23
Q

What surgical procedure is indicated for cecal neoplasia in dogs?

A

Typhlectomy.

24
Q

Which diagnostic imaging technique is best for identifying colonic polyps?

A

Colonoscopy.

25
Q

What are the main functions of goblet cells in the colon?

A

Secretion of mucus.

26
Q

Name two common indications for colectomy in cats.

A

Megacolon, neoplasia.

27
Q

What is the function of the ileocolic junction?

A

Prevents reflux of colonic contents into the small intestine.

28
Q

What is the significance of aldosterone in colonic sodium absorption?

A

Enhances sodium absorption via amiloride-sensitive sodium channels.

29
Q

What is the role of the cranial rectal artery in colonic vasculature?

A

Supplies the distal descending colon and rectum.

30
Q

How does colonic wound strength compare to that of the small intestine during healing?

A

Colonic wound healing is slower than the small intestine, with strength returning to 75% at 4 months.

31
Q

A cat presents with chronic obstipation and megacolon. What medical management options are available before considering surgery?

A

Stool softeners, prokinetics, manual evacuation.

32
Q

A dog presents with colonic volvulus. What are the key clinical signs and imaging findings?

A

Abdominal distension, gaseous distension on radiographs.

33
Q

You are performing a subtotal colectomy in a cat with megacolon. What considerations should you have regarding the ileocolic junction?

A

Preserving the ileocolic junction reduces the risk of small intestinal bacterial overgrowth.

34
Q

What complications can arise from a combined abdominal transanal pull-through procedure for colorectal tumors?

A

Wound dehiscence, fecal incontinence.

35
Q

In a dog with a colonic tumor, why might you perform a CT scan prior to surgery?

A

To assess tumor size, invasion, and potential metastasis.

36
Q

Which antibiotic is recommended for perioperative prophylaxis in colonic surgery?

A

C) Cefoxitin

37
Q

Which of the following is a risk factor for colonic wound dehiscence?

A

A) Hypoperfusion

38
Q

Which diagnostic method is best suited for evaluating submucosal colonic lesions?

A

A) Ultrasound

39
Q

What is the most likely complication after colopexy?

A

D) Fecal incontinence

40
Q

In which type of colonic neoplasia is immunohistochemistry most useful?

A

B) Gastrointestinal stromal tumors (GIST)

41
Q

Postoperative hemorrhage is a common complication of biofragmentable anastomosis rings.

A

False

42
Q

Cats with megacolon often respond well to long-term medical management alone.

A

False

43
Q

Colonic anastomosis using staples tends to result in more fibrosis compared to sutures.

A

False

44
Q

The cranial mesenteric artery supplies the entire transverse colon.

A

False

45
Q

The submucosa is the weakest layer of the colon.

A

False

ECVS Tobias (16 decks)

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