Brainstem Anatomy

Question 1

Signs and symptoms of cranial nerve lesion usually present on the ___ side to the lesion if the nucleus or nerve is damage.

Answer 1

Ipsilateral.

Question 2

Damage to the nucleus or nerve fibers presents as a ___ motor neuron lesion.

Answer 2

Lower.

Question 3

What is occurring when there are upper motor neuron signs?

Answer 3

Corticobulbar fibers are causing the impairment.

Question 4

What tracts make up the “long tract”, and how do their lesions present?

Answer 4

LONG TRACT

1. Corticospinal
2. Dorsal Column Medial Leminiscus
3. Spinothalamic

Present contralateral to lesion.

Question 5

What’s one way a LMN lesion looks different than an UMN lesion?

Answer 5

UMN = no gag reflex

Question 6

What separates sensory from motor in the 4th ventricle?

Answer 6

Sulcus limitans.

Question 7

Where in the 4th ventricle is the division between the pons and medulla?

Answer 7

At the widest point of the 4th ventricle, corresponding to the vestibular nucleus area.

Question 8

What features are seen at every level of the brainstem?

Answer 8

Reticular formation
Medial leminiscus
Spinothalamic
Corticospinal

Question 9

Where in the brainstem is the reticular formation and what functional areas is it associated?

Answer 9

The core. Motor and sensory; many different functions.

Question 10

T/F In the trigeminal system, pain and temperature and crude touch are separate from discriminative touch and proprioception?

Answer 10

True.

Question 11

Were are pain and temperature, discriminative touch from in the trigeminal complex?

Answer 11

PAIN AND TEMP
-spinal tract and nucleus of V (C3 to caudal pons)

DISCRIMINATIVE TOUCH
-main sensory nucleus of trigeminal in rostal pons

Question 12

Where do the muscles of mastication travel?

Answer 12

To Mesencephalic nucleus in midbrain.

Question 13

Where do sensations of the face relay before going to the post central gyrus?

Answer 13

Contralateral VPM of thalamus.