Corticobulbar Fun Facts

Question 1

Corticobulbar Fibers to Hypoglossal Nucleus. If central lesion?

Answer 1

will cause contralateral denervation of the tongue

Question 2

Corticobulbar Fibers to Hypoglossal Nucleus. If peripheral (lower) lesion?

Answer 2

Will cause ipsilateral denervation of the tongue

Question 3

A 53- year old man is injured in a traffic accident. Six months later, a neurological examination reveals residual weakness affecting the left side of the tongue. An injury to the hypoglossal nerve has occurred at the level of the hypoglossal canal. The weakness of the tongue reflects injured???

Answer 3

Lower motor neurons

Question 4

Corticobulbar Fibers to PPRF (conjugate eye movements).. If central lesion (either to the frontal eye field BA8 or to the internal capsule)

Answer 4

The patient will have a gaze TOWARD the side of the lesion (draw out the pathway to help)

Question 5

Corticobulbar Fibers to PPRF (conjugate eye movements). If peripheral lesion (exiting from the abducens or occulomotor nucleus)

Answer 5

It depends on the side, will lose the extraocular muscle that innervates it (lateral rectus or medial rectus)

Question 6

Corticobulbar Fibers to Facial Nucleus. Contralateral Central Facial Lesion??

Answer 6

Loss of lower facial muscles but still able to move forehead due to partial innervation from the ipsilateral cortex

Question 7

Corticobulbar Fibers to Facial Nucleus. Ipsilateral Central Facial Lesion.

Answer 7

No loss because the majority of the innervation comes from the contralateral cortex

Question 8

Corticobulbar Fibers to Facial Nucleus. Peripheral Facial Lesion?

Answer 8

Will result in total loss of muscle innervation on the ipsilateral side