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USAHS NEUROSCIENCE EXAM 3 NEWEST 2024
ACTUAL EXAM COMPLETE 100 EXAM
QUESTIONS AND CORRECT ANSWER S
(VERIFIED ANSWER S) |ALREADY GRADED
A+||BRAND NEW VERSION!!
**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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