Cranial nerves

Question 1

List the cranial nerves

Answer 1

1. Olfactory
2. Optic
3. Oclomotor
4. Trochlear
5. Trigeminal
6. Abducens
7. Facial
8. Vestibulocochlear
9. Glossopharyngeal
10. Vagus
11. Accessory
12. Hypoglossal

Question 2

List motor/ sensory/ both in order

Answer 2

1. Sensory
2. Sensory
3. Motor
4. Motor
5. Both
6. Motor
7. Both
8. Sensory
9. Both
10. Both
11. Motor
12. Motor

Question 3

What innervates the muscle that closes the eye and what is this muscle’s name?

Answer 3

1. Orbicularis Oculi

2. The palperbreal branch of the auriculopalperbral: Facial nerve = CN 7, SVE

Question 4

What innervates the muscle that lifts the upper eye lid and eyebrow and what is this muscle’s name

Answer 4

1. Superciliaris

2. The palperbreal branch of the auriculopalperbral: Facial nerve = CN 7, SVE

Question 5

What innervates the muscle that draws lateral palpebral angle posteriorly and what is this muscle’s name

Answer 5

1. Retractor anguli occuli

2. The palperbreal branch of the auriculopalperbral: Facial nerve = CN 7, SVE

Question 6

What innervates the muscle that Lifts the upper eyelid and what is this muscle’s name

Answer 6

1. Levetor palpebrae superioris

2. Occulomotor CN3, SE

Question 7

What innervates the smooth muscles of the upper and lower lids?

Answer 7

1. Sympathetics (AE) from cranial cervical ganglion supply

Question 8

What is the role of the orbicularis oculi?

What would happen if it doesn’t work properly?

Answer 8

1. To close the eye and so sweep tears across the front of the eye, keeping it clean and moist. If this fails to work, corneal ulcers develop

Question 9

What is the sensory nerve supply to the region around the eye?

Answer 9

1. Trigeminal
2. Ophthalmic division to upper lid, maxillary to lower lid. except dogs=
3. zygomaticotemporal is a branch of the maxillary