The Cranial Nerves and the Circle of Willis

Question 1

If the optic nerve (II) or olfactory tract is interrupted, will it regenerate?

Answer 1

No, it will not regenerate

Question 2

What lies directly above the tentorium?
A. The parietal lobes.
B. The temporal lobes.
C. The occipital lobes.
D. The frontal lobes.
E. The cerebellum.

Answer 2

The occipital lobes

Question 3

What brain stem region lies or sits in the tentorial notch (incisure)?
A. Pons.
B. Cerebellum.
C. Temporal lobes.
D. Midbrain.
E. Hypothalamus.

Answer 3

Midbrain

Question 4

What is the name of the sensory ganglion that is located in the temporal bone where the arrow is pointing?
A. Otic ganglion.
B. Pterygopalatine ganglion.
C. Submandibular ganglion.
D. Geniculate ganglion.

Answer 4

Geniculate ganglion

Question 5

What are the major structural differences between dorsal root ganglia (DRG) and autonomic ganglia?
A. The DRG contain the cell bodies of sensory neurons whereas the sympathetic ganglia contain the synaptic junctions between preganglionic and postganglionic neurons.
B. One is derived from neural crest and the other from neural tube.
C. Both have synapses.
D. One belongs to the CNS and the other belongs to the PNS.

Answer 5

The DRG contain the cell bodies of sensory neurons whereas the sympathetic ganglia contain the synaptic junctions between preganglionic and postganglionic neurons.

Question 6

What cells form the myelin sheaths around the axons in CN II and VIII?
A. Astrocytes and Schwann cells, respectively.
B. Ependymal cells and Schwann cells, respectively.
C. Oligodendrocytes and Schwann cells, respectively.
D. Oligodendrocytes and fibroblasts, respectively.
E. Schwann cells and oligodendrocytes, respectively.

Answer 6

Oligodendrocytes and Schwann cells, respectively.