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Re: Lecture 68: Functional Components Cranial Nerves - True False

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Posted by lae2 on December 09, 2021 at 14:47:08:

In Reply to: Re: Lecture 68: Functional Components Cranial Nerves - True False posted by Alexis on December 08, 2021 at 22:31:58:

: Cranial Nerve Functional Components
: 1. The olfactory nerve fascicles pass through the cribriform plate of the ethmoid bone to enter the nasal cavity from the anterior cranial fossa.

: - true. Correct

: 2. A fracture of the cribriform plate may cause a CSF leak.

: - true. Correct

: 3. The olfactory nerve has native SVA and GVE components.

: - false ⇒ only SVA. Correct.

: 4. A hypophyseal tumor is expected to disrupt central vision.

: - false ⇒ peripheral vision disruption. Correct.

: 5. The chiasmatic groove is posterior to the hypophyseal fossa.

: - false ⇒ anterior. Correct.

: 6. The afferent limb of the pupillary light reflex is mediated by the SSA component of the oculomotor nerve.

: - false ⇒ not SSA. Mediated by SSA of optic nerve.

: 7. A lesion of the proximal superior division of the oculomotor nerve is expected to disrupt GSE and GVE components.

: - false ⇒ superior division doesn't do GVE. Correct.

: 8. Preganglionic GVE cell bodies from the Edinger-Westphal nucleus synapse in the submandibular ganglion.

: - false ⇒ ciliary ganglion. Correct.

: 9. The short ciliary nerves host native GSA fibers non-native preganglionic GVE fibers.

: - false ⇒ opposite of what it says. False, but non-native post gang.

: 10. Postganglionic GVE fibers having cell bodies in the ciliary ganglion mediate accommodation as well as pupillary dilation.

: - false ⇒ pupillary constriction not dilation. Correct.

: 11. A lesion of the greater superficial petrosal nerve at the lacerate foramen disrupts preganglionic GVE fibers that influence lacrimation.

: - true. Correct.

: 12. The short ciliary nerves host non-native postganglionic fibers from both divisions of the autonomic nervous system.

: - true. Correct.

: 13. A lesion of the internal carotid nerve is expected to disrupt preganglionic sympathetic GVE fibers and cause unilateral mydriasis.

: - false ⇒ postganglionic and you'd have miosis. Correct.

: 14. A cavernous sinus infection is expected to cause unilateral pupil dilation given that the sympathetic root of the ciliary ganglion remains healthy.

: - we aren't sure. True. Take out III but spare spare sympathetic.

: 15. A mild ptosis in a young person may be caused by a GVE disturbance whereas a frank ptosis is caused by GSE disturbance.

: - false ⇒ SVE for frank ptosis??. True. Levator palpebrae superioris is GSE.

: 16. Sneezing while looking at bright light is thought to be, in part, mediated by the GSA component of the trigeminal nerve.

: - can you explain the pathway of this reflex??. Corneal irritation. V1 referred to V2 and sneeze reflex.

: 17. The infraorbital nerve, while in the infraorbital canal, carries non-native postganglionic GVE fibers en route to the lacrimal gland.

: - false ⇒ lacrimal nerve. Correct. Follow zygomaticotemporal. Branches before canal.

: 18. The lacrimal nerve proper is GSA only and does not mediate lacrimation.

: - true. Correct. Has hitchhikers that do so.

: 19. Traveling along with the distal parts of the lacrimal nerve are postganglonic GVE fibers whose cell bodies are located in the pterygopalatine ganglion.

: - true. Correct.

: 20. The extraocular muscles, with the exception of the superior oblique, are innervated by SVE fibers.

: - false => extraocular muscles are GSE & GVE. False. But extraocular are all GSE.

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