USAHS NEUROSCIENCE EXAM 3 NEWEST

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USAHS NEUROSCIENCE EXAM 3 NEWEST

ACTUAL EXAM COMPLETE 100 EXAM

QUESTIONS AND CORRECT ANSWER S

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**Question: What is the cranial nerve exit for the olfactory

nerve?**

**Answer :** Cribriform plate

**Rationale:** The olfactory nerve (CN I) exits the skull

through the cribriform plate of the ethmoid bone, allowing olfactory sensory neurons to reach the nasal mucosa.

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**Question: What is the cranial nerve exit for the optic nerve?**

**Answer :** Optic canal

**Rationale:** The optic nerve (CN II) exits the orbit via the

optic canal in the sphenoid bone, carrying visual information from the retina to the brain.

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**Question: What is the cranial nerve exit for the oculomotor

nerve?**

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**Answer :** Superior orbital fissure

**Rationale:** The oculomotor nerve (CN III) exits the

midbrain and passes through the superior orbital fissure to innervate most extraocular muscles, the pupil, and the lens.

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**Question: What is the cranial nerve exit for the trochlear

nerve?**

**Answer :** Superior orbital fissure

**Rationale:** The trochlear nerve (CN IV), after exiting

dorsally from the midbrain, travels through the superior orbital fissure to innervate the superior oblique muscle.

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**Question: How many branches does the trigeminal nerve have

and what are their exits?**

**Answer :**

• 3 branches
• Ophthalmic (V1) - Superior orbital fissure
• Maxillary (V2) - Foramen rotundum

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d. Mandibular (V3) - Foramen ovale (Note: Foramen spinosum

is for the middle meningeal artery, not V3) **Rationale:** The trigeminal nerve (CN V) has three branches: V1 (ophthalmic) exits via the superior orbital fissure, V2 (maxillary) via the foramen rotundum, and V3 (mandibular) via the foramen ovale, providing sensory and motor innervation to the face.

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**Question: What is the cranial nerve exit for abducens?**

**Answer :** Superior orbital fissure

**Rationale:** The abducens nerve (CN VI) exits the pons and

passes through the superior orbital fissure to innervate the lateral rectus muscle for lateral eye movement.

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**Question: What is the cranial nerve exit for the facial

nerve?**

**Answer :** Stylomastoid foramen and internal acoustic

meatus

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**Rationale:** The facial nerve (CN VII) enters the temporal

bone via the internal acoustic meatus with CN VIII, then exits through the stylomastoid foramen to innervate facial muscles.

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**Question: How many branches does the facial nerve have?

What is the nerve exit?**

**Answer :**

• Greater petrosal nerve - Foramen lacerum (via hiatus of the

facial canal, then joining with deep petrosal nerve to exit via foramen lacerum)

- Note: CN VII has five major terminal branches (temporal,

zygomatic, buccal, mandibular, cervical) exiting the stylomastoid foramen, but your Question specifies the greater petrosal nerve.

**Rationale:** The greater petrosal nerve, a parasympathetic

branch, exits early via the foramen lacerum to the pterygopalatine ganglion; terminal branches exit the stylomastoid foramen.

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