Lab 2

Question 2

2?

3?

Answer 2

2- Caudate nucleus

3- Thalamus

Question 3

4?

5?

Answer 3

4- Lateral geniculate nucleus

5- Medial geniculate nucleus

Question 4

Name the cerebral lobe that receives information from the lateral geniculate nucleus

Answer 4

occipital lobe (visual cortex)

Question 5

Name the cerebral lobe that receives information from the medial geniculate nucleus

Answer 5

1. the ectosylvian gyrus in the temporal lobe (auditory cortex)

Question 6

The basal nuclei are a part of the

a. sensory system
b. motor system

Answer 6

b. motor system

Question 7

The thalamus is derived from the:

a. diencephalon
b. mesencephalon
c. telencephalon

Answer 7

diencephalon

Question 8

1

2

Answer 8

1. White matter
2. Gray matter

Question 9

3

4

5

Answer 9

3- Caudate nucleus

4- Corpus callosum

5- Internal capsule

Question 10

6

7

Answer 10

6- Thalamus

7- Hypothalamus

Question 11

What is the functional difference between the corpus callosum and internal capsule?

Answer 11

1. Corpus callosum sends signals back and forth to each hemispheres of brain
2. Internal capsule sends all fibers to and from the cerebral cortex

Question 12

In humans, an experimental surgery that transplants dopamine producing cells into the caudate nucleus is performed to improve some patients with Parkinson’s disease.

If you were to practice this surgery on a dog, how would you surgically access the caudate nucleus with minimum damage to other neural
tissues?

Answer 12

Dorsal, aspect, through corpus callosum to then separate the two hemispheres

Question 13

1

2

3

Answer 13

1. Rostral colliculus (looks like balls)
2. Caudal colliculus (looks like pointy boobs)
3. Trochlear nerve

Question 14

1?

2?

3? (that very small line)

Answer 14

1. Crus cerebri
2. oculomotor nerve
3. Trochlear nerve

Question 15

What structure of the midbrain gives rise to the trochlear nerve?

Answer 15

Caudal colliculus

Question 16

The motor nucleus of the trochlear nerve gives rise to the trochlear nerve. This nucleus is located in the midbrain at the level of the caudal colliculi:

• What clinical sign would you expect to see when this motor nucleus is involved in a lesion of the right midbrain in a dog or cat?

Answer 16

Extorsion of the left eye

Question 17

The motor nucleus of the trochlear nerve gives rise to the trochlear nerve. This nucleus is located in the
midbrain at the level of the caudal colliculi:

• What would you expect to see if the right trochlear nerve is inflamed in a dog or cat?

Answer 17

Extorsion of the right eye

Question 18

c. What is the functional difference between the lateral geniculate nucleus and the rostral colliculus?

Answer 18

1. Lateral geniculate nucleus - conscious visual information - sensory
2. Rostral colliculus is the center for visual reflex - sensory and motor

Question 19

The crus cerebri is a part of the:

a. sensory system
b. motor system

Answer 19

Motor system

Question 20

Where do fibers of the crus cerebri originate?

Answer 20

Originate in the cerebral cortex and descend in the internal capsule

Question 21

List three clinical signs induced by a lesion of the right oculomotor nerve?

Answer 21

1. Ptosis of right eye (drooped eyelid)
2. ventrolateral strabismus
3. Dilated pupil

Question 22

1, What type of matter

2, What type of matter

Answer 22

1- White matter

2- Grey matter

Question 23

3

4

5

Answer 23

3- Caudate nucleus

4- Corpus callosum

5- Internal capsule