Class 2 - Station 4: Nerve Supply to Abdominal Viscera

Question 1

What nerves carry the sympathetic supply to the GI tract?

Answer 1

• Abdominopelvic splanchnic nerves (greater, lesser and least)
• Prevertebral sympathetic ganglioa
• Abdominal aortic plexuses

Question 2

What nerves supply the Gi tract with parasympathetic innervation?

Answer 2

• Cn10 = vagus
• Pelvic splanchnic nerves (S2, S3, S4)

Question 3

What effect does the parasympathetic system have on GI secretion?

Answer 3

Increases

Question 4

What effect does the parasympathetic system have on GI motility and peristalsis?

Answer 4

Increases

Question 5

What effect does the parasympathetic system have on GI blood vessels?

Answer 5

Little effect

Question 6

What effect does the sympathetic system have on GI secretion?

Answer 6

Decreases

Question 7

What effect does the sympathetic system have on GI motility and peristalsis?

Answer 7

Decreases

Question 8

What effect does the sympathetic system have on GI blood vessels?

Answer 8

Vasoconstriction

Question 9

What is the functional difference between the thoracic splanchnic nerves and the pelvic splanchnic nerves?

Answer 9

Thoracic splanchnic = sympathetic

Pelvic splanchnic = parasympathetic

Question 10

What is the effect of a vagotomy on gastric secretion?

Answer 10

Reduction

Question 11

What is the chief difference between the arrangement of ganglia in the sympathetic vs parasympathetic system?

Answer 11

Sympathetic = paravertebral

Parasympathetic = next to or in the target organ