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Re: T/F Functional Components of the Cranial Nerves

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Posted by lae2 on December 10, 2014 at 08:18:27:

In Reply to: T/F Functional Components of the Cranial Nerves posted by Ichneumia Rapidae on December 06, 2014 at 14:37:36:

: 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 AGREE.

: 2. A fracture of the cribriform plate may cause a CSF leak. TRUE? AGREE. !!!!!!!!!!!!!!!!!!!!!!!

: 3. The olfactory nerve has native SVA and GVE components. FALSE, only SVA. Does it carry non-natives? AGREE. !!!!!!!!!

: 4. A hypophyseal tumor is expected to disrupt (central) vision. False, peripheral, disrupted because most medial fibers to hypophyseal fossa in chiasmatic groove are responsible for peripheral vision. AGREE.

: 5. The chiasmatic groove is (posterior) to the hypophyseal fossa. FALSE, anterior AGREE.

: 6. The afferent limb of the pupillary light reflex is mediated by the SSA component of the (oculomotor) nerve. FALSE, Optic. CN:III is GVE, GSE, responsible for efferent limb? AGREE.

: 7. A lesion of the proximal (superior) division of the oculomotor nerve is expected to disrupt GSE and GVE components. FALSE, inferior. AGREE.

: 8. Preganglionic GVE cell bodies from the Edinger-Westphal nucleus synapse in the (submandibular) ganglion. FALSE, ciliary AGREE.

: 9. The short ciliary nerves host native GSA fibers non-native preganglionic GVE fibers. TRUE, and postganglionic sympathetic fibers! FALSE!!!!!!!!!

: 10. Postganglionic GVE fibers having cell bodies in the ciliary ganglion mediate accommodation as well as pupillary (dilation). FALSE, constriction AGREE.

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

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

: 13. A lesion of the internal carotid nerve is expected to disrupt preganglionic sympathetic GVE fibers and cause unilateral mydriasis. FALSE x2. AGREE.

: 14. A cavernous sinus infection is expected to cause unilateral pupil dilation given that the sympathetic root of the ciliary ganglion remains healthy. TRUE, oculomotor nerve carrying GVE preganglionic parasympathetic fibers would be disrupted causing unopposed dilation, thus you have mydriasis. AGREE.

: 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, sympathetic AGREE.

: 16. Sneezing while looking at bright light is thought to be, in part, mediated by the GSA component of the trigeminal nerve. TRUE, something to do with corneal light sensitivity? AGREE. !!!!!!!!!!!!!!!!

: 17. The infraorbital nerve, while in the infraorbital canal, carries non-native postganglionic GVE fibers en route to the lacrimal gland. FALSE?, probably zygomatic nerve, zygomaticotemporal n. carry these fibers? AGREE. !!!!!!!

: 18. The lacrimal nerve proper is GSA only and does not mediate lacrimation. TRUE, native lacrimal nerve fibers are GSA (trigeminal). AGREE. !!!!!!!!!

: 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 AGREE.!!!!!!!!!!

: 20. The extraocular muscles, with the exception of the superior oblique, are innervated by SVE fibers. FALSE, all extra ocular muscles are innervated by GSE fibers. Trochlear nerve for superior oblique m. AGREE.

: Mongooses have oval pupils. !!!!!!!!!

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