4.2.1 Cranial Nerves and the CNS

Question 1

What do the cranial nerves supply?

Answer 1

Supplying tissues and structures of the head and neck region including special sense organs

Question 2

What part of the nervous system are cranial nerves part of?

Answer 2

Peripheral, not I and II they are continuations of the forebrain and thus are part of the CNS

Question 3

How do cranial nerves arise?

Answer 3

Arise as pairs

Question 4

What are most cranial nerves associated with?

Answer 4

Associated with the brainstem, this is the location of their nuclei

Question 5

What are the different types of fibres that cranial nerves have?

Answer 5

Sensory
Motor
Parasympathetic
Mix of all or some

Question 6

Where can cranial nerves be injured?

Answer 6

• During its route outside of the CNS
• Brainstem
• Neurones within forebrain/brainstem which connect other parts of brain to cranial nerves

Question 7

How many cranial nerves are from each region of the brain?

Answer 7

2 CN arise from forebrain
I, II
2 CN arise from midbrain
III, IV
4 CN arise from pons
V, VI, VII, VIII
4 CN arise from medulla
IX, X, XI, XII

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Question 8

Name all of the cranial nerves and their locations

Answer 8

I- Olefactory, forebrain
II- Optic, forebrain

III- Oculomotor, midbrain
IV- Trochlear, midbrain

V- Trigeminal, pons
VI- Abducens, pons
VII- Facial, pons
VIII- Vestibulocochlear, pons

IX- Glossopharyngeal, medulla
X- Vagus, medulla
XI- Accessory, medulla
XII- Hypoglossal, medulla