Ch. 11: Pons

Question 1

The pontine sensory nucleus is located in the:
A. Basilar pons
B. Tegmentum

Answer 1

B. Tegmentum

Question 2

The motor tracts from the cerebral cortex descend in the:
A. Basilar pons
B. Tegmentum

Answer 2

A. Basilar pons

Question 3

The most ascending and descending tracts in the pons are located in the:
A. Dorsomedial area
B. Central area
C. Dorsomedial and central areas
D. Lateral tegmentum and basilar pons

Answer 3

D. Lateral tegmentum and basilar pons

Question 4

The primary sensory neurons that mediate facial pain and temperature have their perikarya in the:
A. Nucleus of the mesencephalic tract of the trigeminal nerve
B. Spinal nucleus of the trigeminal nerve
C. Trigeminal ganglion
D. Motor nucleus of the trigeminal nerve

Answer 4

C. Trigeminal ganglion

Question 5

The pontine sensory nucleus of the trigeminal nerve mediates signals for:
A. Touch
B. Temperature
C. Pain
D. Proprioception

Answer 5

A. Touch

Question 6

The nucleus that mediates facial pain and temperature is present in the:
A. Midbrain
B. Pons
C. Medulla
D. Spinal cord

Answer 6

C. Medulla

Question 7

The motor nucleus of the trigeminal nerve innervates the:
A. Tensor tympani muscle
B. Stapedius muscle

Answer 7

A. Tensor tympani muscle

Question 8

The primary sensory neurons that mediate proprioception from the face have their perikarya in the:
A. Nucleus of the mesencephalic tract of the trigeminal nerve
B. Spinal nucleus of the trigeminal nerve
C. Trigeminal ganglion
D. Motor nucleus of the trigeminal nerve

Answer 8

A. Nucleus of the mesencephalic tract of the trigeminal nerve

Question 9

The spinal tract of the trigeminal nerve is made of axons of the _____ neurons. It terminates in the _____ of the trigeminal nerve.
A. Primary sensory, nucleus of the spinal tract
B. Second-order, nucleus of the mesencephalic nucleus of the trigeminal nerve
C. Third-order, pontine sensory nucleus

Answer 9

A. Primary sensory, nucleus of the spinal tract

Question 10

Proprioception from the digastricus muscle originates from \_\_\_\_\_ and is carried by the \_\_\_\_\_ nerve.
A. Free nerve endings, ophthalmic
B. Ruffini's corpuscles, maxillary
C. Muscle spindle, mandibular
D. Pacinian corpuscle, maxillary

Answer 10

C. Muscle spindle, mandibular

Question 11

T/F: Sensory innervation of the orbital area is innervated by the ophthalmic nerve.

Answer 11

True

Question 12

Pontocerebellar fibers originate from the:
A. Pontine sensory nucleus of the trigeminal nerve
B. Pontine nuclei
C. Motor nucleus of the trigeminal nerve
D. Trigeminal nerve

Answer 12

B. Pontine nuclei

Question 13

The trigeminal lemniscus mediates signals for:
A. Pain and temperature
B. Touch
C. Proprioception
D. All of the above

Answer 13

D. All of the above

Question 14

A male golden retriever has had difficulty eating for 3 days and then stopped eating. On the fourth day the owner noticed that the dog’s jaw hangs open and he is unable to close his mouth. Neurologic examination shows hypotonus of masticatory muscles
and fails to respond to stimulus applied to the orbital, cheek, nostril, or mandibular areas. The eyes follow your moving hand. He also shows normal spontaneous blinking of the eyes. What would you expect to see if you examine the palpebral and corneal reflexes?
A. The palpebral reflex is present, but the corneal reflex is absent.
B. The palpebral reflex is absent, but the corneal reflex is present.
C. Both palpebral and corneal reflexes are present.
D. Both palpebral and corneal reflexes are absent.

Answer 14

D. Both palpebral and corneal reflexes are absent.

Question 15

A dog shows atrophy of the left masseter and temporal muscles. The palpebral reflex is also absent on the left eye. A lesion is most likely involving the:
A. Oculomotor nerve
B. Trigeminal nerve
C. Abducent nerve
D. Facial nerve

Answer 15

B. Trigeminal nerve