Ch. 3: Anatomy of the Canine Brain

Question 1

Which of the following represents gray matter?
A. Cerebellar peduncles
B. Crus cerebri
C. Internal capsule
D. Hypothalamus

Answer 1

D. Hypothalamus

Question 2

Which of the following is a part of the rhinencephalon?
A. Basal nuclei
B. Piriform lobe
C. Hypothalamus
D. Occipital lobe

Answer 2

B. Piriform lobe

Question 3

Which of the following is a derivative of the diencephalon?
A. Caudate nucleus
B. Piriform lobe
C. Thalamus
D. Rostral colliculus

Answer 3

C. Thalamus

Question 4

The medial geniculate nucleus projects fibers primarily to the:
A. Piriform lobe
B. Occipital lobe
C. Frontal lobe
D. Temporal lobe

Answer 4

D. Temporal lobe

Question 5

Which structure projects fibers to the occipital lobe?
A. Olfactory bulb
B. Lateral geniculate nucleus
C. Caudal colliculus
D. Crus cerebri

Answer 5

B. Lateral geniculate nucleus

Question 6

The chemoreceptor trigger zone is located in the:
A. Area postrema
B. Trapezoid body
C. Pons
D. Tectum of the midbrain

Answer 6

A. Area postrema

Question 7

The postcruciate gyrus receives:
A. Auditory information
B. Olfactory information
C. Somesthetic/somatosensory information
D. Visual information

Answer 7

C. Somesthetic/somatosensory information

Question 8

The dog shows atrophy on the left half of the tongue. The tongue protrudes to the:
A. Right
B. Left

Answer 8

B. Left

Question 9

The visual reflex is mediated by the:
A. Crus cerebri
B. Medial geniculate nucleus
C. Rostral colliculus
D. Caudal colliculus

Answer 9

C. Rostral colliculus

Question 10

The ectosylvian gyrus is a part of the:
A. Olfactory area
B. Visual area
C. Auditory area
D. motor area

Answer 10

C. Auditory area

Question 11

The tectum is a part of the:
A. Diencephalon
B. Pons
C. Medulla oblongata
D. Midbrain

Answer 11

D. Midbrain

Question 12

Which of the following structures lies immediately caudal to the crus cerebri?
A. Vestibular nuclei
B. Basilar pons
C. Caudate nucleus
D. Optic chiasm

Answer 12

B. Basilar pons

Question 13

A dog shows the following clinical signs of the right eye:
- Pupillary dilation
- Lateral strabismus
- Drooped eyelid
This lesion likely involves the right side of the:
A. Pons
B. Midbrain
C. Medulla oblongata
D. Spinal cord

Answer 13

B. Midbrain

Question 14

The corpus callosum is:
A. A tract that carries primarily motor information to the basal nuclei
B. One of the cerebral commissures
C. Not visible on midsagittal brain section
D. A gray matter of the cerebrum

Answer 14

B. One of the cerebral commissures

Question 15

The midbrain gives rise to the:
A. CNs II and III
B. CN III only
C. CNs III and IV
D. CN V only

Answer 15

C. CNs III and IV

Question 16

The nodulus of the cerebellum is a part of the:
A. Cerebellar hemisphere
B. Vermis

Answer 16

B. Vermis

Question 17

The rostral and caudal colliculi are a part of the:
A. Tegmentum
B. Cerebrum
C. Tectum
D. Pons

Answer 17

C. Tectum

Question 18

If the dog displays ventrolateral strabismus, what other clinical sign would you expect to see?
A. Blindness
B. Pupillary dilation
C. Facial paralysis
D. Loss of facial sensation

Answer 18

B. Pupillary dilation

Question 19

Which statement is correct about the cerebellum?
A. The medullary velum is also known as the vermis
B. The right side of the cerebellum regulates the left side of the body
C. The flocculonodular lobe is essential for equilibrium
D. The nodulus is a part of the cerebellar hemisphere

Answer 19

C. The flocculonodular lobe is essential for equilibrium

Question 20

The dog displays no blinking (or incomplete weak blinking) and dry cornea. Which CN is most likely lesioned?
A. III
B. V
C. VI
D. VII

Answer 20

D. VII

Question 21

Which structure is made of sensory fibers only?
A. Crus cerebri
B. Fasciculus cuneatus
C. Hypoglossal nerve
D. Abducent nerve

Answer 21

B. Fasciculus cuneatus

Question 22

Which statement is correct about the cranial nerves?
A. The vagus emerges from the pons to innervate the visceral organs
B. The spinal root of the accessory innervates the muscles of the larynx and pharynx
C. The vestibulocochlear is made of motor nerve fibers
D. The abducent innervates the lateral rectus and retractor bulbi muscles

Answer 22

D. The abducent innervates the lateral rectus and retractor bulbi muscles

Question 23

The vagus and glossopharyngeal nerves emerge from the:
A. Ventral side of the medulla
B. Lateral side of the medulla
C. Lateral side of the pons
D. Ventral side of the pons

Answer 23

B. Lateral side of the medulla

Question 24

Some axons that form the crus cerebri continue to descend in the medulla as the:
A. Internal capsule
B. Pyramid
C. Trapezoid body
D. Fasciculus cuneatus

Answer 24

B. Pyramid

Question 25

Which structure does not belong to a functional group of structures listed below?
A. Cochlear nerve
B. Acoustic stria
C. Lateral geniculate nucleus
D. Trapezoid body
E. Temporal lobe

Answer 25

C. Lateral geniculate nucleus

Question 26

Which tract mediates signals for proprioception from the upper thoracic and cervical areas of the body?
A. Fasciculus gracilis
B. Spinal tract of the trigeminal
C. Dorsal spinocerebellar tract
D. Fasciculus cuneatus

Answer 26

D. Fasciculus cuneatus

Question 27

The pharyngeal mucosa is innervated by the:
A. CN XI and XII
B. CN IX and X
C. CN VII and XI
D. CN XI

Answer 27

B. CN IX and X

Question 28

Which CNs innervate the taste buds of the tongue?
A. Trigeminal and abducent
B. Facial and glossopharyngeal
C. Abducent and vestibulocochlear
D. Trigeminal and vagus

Answer 28

B. Facial and glossopharyngeal

Question 29

A nerve or tract that carries only motor signals is the:
A. Internal capsule
B. Pyramid
C. Maxillary nerve
D. Glossopharyngeal nerve

Answer 29

B. Pyramid

Question 30

Which of the following would be found on a transverse section of the brain at the level of the midbrain?
A. Optic chiasm
B. Pyramid
C. Rostral colliculus
D. Thalamus

Answer 30

C. Rostral colliculus