Cranial nerves

Question 1

Where do 2nd order cranial nerves synapse? ‘

Answer 1

Cranial nerve 2nd neurones decussate in the brainstem and synapse in the thalamus to become order 3rd neurones

Question 2

Where do 1st order cranial nerves synapse?

Answer 2

The brain stem

Question 3

What is the significance of bilateral cranially innervated?

Answer 3

They receive innovation from both sides of the brain. The clinical significance is that when is a there so clinical application when at

Question 4

Which is the only contralateral cranial nerve?

Answer 4

Hypoglossal ((CNXII)

This is very similar to spinal- opposite sides innovate each other

Question 5

What is the main difference between SOME and corticobulbar motor pathways?

Answer 5

Some cortico bulbar pathways are bilaterally innervated- fibres from both left and right sides of the brain innervate the lower motor neurone

Question 6

What are the 3 different trigeminal sensory nuclei?

Where are they each located?

Answer 6

1) chief sensory nuclei- pons
2) spinal nucleus - medulla
3) mesencephalic - midbrain