Colorectal Anatomy and Physiology Practice Questions

Question 1

Which of the following is not a branch of the inferior mesenteric artery?

Accepted Answer

Middle rectal

Answer

Left colic

Answer

Superior rectal

Answer

Sigmoidal artery

Question 2

During incision and drainage of ischiorectal abscess, which nerve is most likely to be injured?

Accepted Answer

Inferior rectal nerve

Answer

Superior rectal nerve

Answer

Superior gluteal nerve

Answer

Inferior gluteal nerve

Question 3

Episotomy extended posteriorly beyond perineal body injuring structure posterior to it, which structure is injured?

Accepted Answer

External anal sphincter

Answer

Urethral sphincter

Answer

Ischiocavernosus

Answer

Bulbospongiosus

Question 4

The following statements concerning the abdominal part of the sympathetic trunk are not true EXCEPT:

Accepted Answer

Gray rami communicantes are given off to the lumbar spinal nerves

Answer

All the ganglia receive white rami communicantes

Answer

It enters the abdomen behind the lateral arcuate ligament

Answer

The trunk passes in 6 segmentally arranged ganglia

Question 5

Which of the following is the terminal group of lymph nodes for the colon?

Accepted Answer

Preaortic

Answer

Paracolic

Answer

Epicolic

Answer

Ileocolic

Question 6

Which of the following is least important in the maintenance of normal fecal continence?

Accepted Answer

Haustral valve

Answer

Anorectal angulation

Answer

Rectal innervation

Answer

Internal sphincter

Question 7

A patient presents with abdominal distension. Based on the X-ray, which of the following bowel loops are dilated?

Accepted Answer

Jejunum

Answer

Duodenum

Answer

Transverse colon

Answer

Ileum

Question 8

External hemorrhoids are innervated by:

Accepted Answer

Pudendal Nerve

Answer

Lumbar Nerves

Answer

Obturator Nerve

Answer

Gluteal Nerves

Question 9

Which artery supplies the ductus deferens?

Accepted Answer

Deferential artery

Answer

Cremasteric artery

Answer

Inferior epigastric artery

Answer

Vesical artery

Question 10

A patient with a non-obstructing carcinoma of the sigmoid colon is being prepared for elective resection. To minimize the risk of postoperative infectious complications, what should be included in your planning?

Accepted Answer

A single preoperative parenteral dose of antibiotic effective against aerobes and anaerobes may provide initial coverage.

Answer

Postoperative administration for 5 to 7 days of parenteral antibiotics effective against aerobes and anaerobes

Answer

Postoperative administration for 2 to 4 days of parenteral antibiotics effective against aerobes and anaerobes

Answer

Avoidance of oral antibiotics to prevent emergence of Clostridioides difficile

Colorectal Anatomy and Physiology — MCQs

Colorectal Anatomy and Physiology — MCQs

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