Exam 3 (Chapter 13) - Reticular Formation

Question 1

True or False: The reticular formation is in the thalamus.

Answer 1

False

Question 2

What is the reticular formation made of?

Answer 2

A mixture of neurites and perikarya

Question 3

What is the name of the sensory nucleus in the medulla oblongata that MEDIATES information to the swallowing center?

Answer 3

Nucleus of the solitary tract

Question 4

What is the name of the motor nucleus that EXECUTES the swallowing reflex?

Answer 4

Nucleus ambiguus

Question 5

What are the two descending tracts that originate from the reticular formation?

Answer 5

1) Pontine reticulospinal tract

2) Medullary reticulospinal tract

Question 6

What is the name of the reticular nucleus that projects its fibers to the spinal cord to inhibit pain signals?

Answer 6

Nucleus raphe magnus

Question 7

True or False: The swallowing center in the reticular formation projects to the nucleus ambiguus to trigger the swallowing reflex.

Answer 7

True

Question 8

True or False: Chemotherapy sickness can be prevented by serotonin receptor antagonists that block serotonin receptors in the chemoreceptor trigger zone.

Answer 8

True

Question 9

Where is the micturition center located?

Answer 9

In the pontine reticular formation

Question 10

Is the pontine reticulospinal tract excitatory or inhibitory to the lower motor neurons for flexors? What about the extensors?

Answer 10

Excitatory for extensors; inhibitory for flexors

Question 11

What is the role of the ascending reticular activating system (ARAS)?

Answer 11

The ARAS acts by exciting nonspecific thalamic nuclei, which in turn activate the entire cerebral cortex.

Question 12

Injury to the reticular formation may result in irreversible __________.

Answer 12

Coma

Question 13

Where is the chemoreceptor trigger zone (CTZ) located?

Answer 13

Area postrema