Lab 2 Flashcards
(23 cards)
2?
3?
2- Caudate nucleus
3- Thalamus
4?
5?
4- Lateral geniculate nucleus
5- Medial geniculate nucleus
Name the cerebral lobe that receives information from the lateral geniculate nucleus
occipital lobe (visual cortex)
Name the cerebral lobe that receives information from the medial geniculate nucleus
- the ectosylvian gyrus in the temporal lobe (auditory cortex)
The basal nuclei are a part of the
a. sensory system
b. motor system
b. motor system
The thalamus is derived from the:
a. diencephalon
b. mesencephalon
c. telencephalon
diencephalon
1
2
- White matter
- Gray matter
3
4
5
3- Caudate nucleus
4- Corpus callosum
5- Internal capsule
6
7
6- Thalamus
7- Hypothalamus
What is the functional difference between the corpus callosum and internal capsule?
- Corpus callosum sends signals back and forth to each hemispheres of brain
- Internal capsule sends all fibers to and from the cerebral cortex
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?
Dorsal, aspect, through corpus callosum to then separate the two hemispheres
1
2
3
- Rostral colliculus (looks like balls)
- Caudal colliculus (looks like pointy boobs)
- Trochlear nerve
1?
2?
3? (that very small line)
- Crus cerebri
- oculomotor nerve
- Trochlear nerve
What structure of the midbrain gives rise to the trochlear nerve?
Caudal colliculus
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?
Extorsion of the left eye
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?
Extorsion of the right eye
c. What is the functional difference between the lateral geniculate nucleus and the rostral colliculus?
- Lateral geniculate nucleus - conscious visual information - sensory
- Rostral colliculus is the center for visual reflex - sensory and motor
The crus cerebri is a part of the:
a. sensory system
b. motor system
Motor system
Where do fibers of the crus cerebri originate?
Originate in the cerebral cortex and descend in the internal capsule
List three clinical signs induced by a lesion of the right oculomotor nerve?
- Ptosis of right eye (drooped eyelid)
- ventrolateral strabismus
- Dilated pupil
1, What type of matter
2, What type of matter
1- White matter
2- Grey matter
3
4
5
3- Caudate nucleus
4- Corpus callosum
5- Internal capsule
