Posted by CB on October 07, 2011 at 21:00:45:
In Reply to: Functional Components of the Cranial Nerves posted by lae2 on October 07, 2011 at 15:14:49:
: Functional Components of the Cranial Nerves - Learning Objectives and Review Questions
: True/False
: 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.
: 2. A fracture of the cribriform plate may cause a CSF leak. True.
: 3. The olfactory nerve has native SVA and GVE components. False- only SVA
: 4. A hypophyseal tumor is expected to disrupt central vision. False- peripheral
: 5. The chiasmatic groove is posterior to the hypophyseal fossa. False- anterior
: 6. The afferent limb of the pupillary light reflex is mediated by the SSA component of the oculomotor nerve. False- optic. The sneeze-preventing reflex is apparently trigeminal though (GSA?)
: 7. A lesion of the proximal superior division of the oculomotor nerve is expected to disrupt GSE and GVE components. False- inferior division carries the GVE fibers
: 8. Preganglionic GVE cell bodies from the Edinger-Westphal nucleus synapse in the submandibular ganglion. False- this is the oculomotor nerve- ciliary ganglion.
9. The short ciliary nerves host native GSA fibers non-native preganglionic GVE fibers. False- these are V1 (opthlamic) nerve derived native fibers, but the post-ganglionic, not pre-ganglionic (dotted blue line)
: 10. Postganglionic GVE fibers having cell bodies in the ciliary ganglion mediate accommodation as well as pupillary dilation. True- focus lens (ciliary body) and constrict pupil (sphincter pupilla)
: 11. A lesion of the greater superficial petrosal nerve at the lacerate foramen disrupts preganglionic GVE fibers that influence lacrimation. True-- pterygopalantine ganglion is distal to the foremen lacerum?
: 12. The short ciliary nerves host non-native postganglionic fibers from both divisions of the autonomic nervous system. True.
: 13. A lesion of the internal carotid nerve is expected to disrupt preganglionic sympathetic GVE fibers and cause unilateral mydriasis. Mydriasis is dialated pupil- apparently. False- as it would result in constriction.
: 14. A cavernous sinus infection is expected to cause unilateral pupil dilation given that the sympathetic root of the ciliary ganglion remains healthy. True- the oculomotor nerve lies within the cavernous sinus. This constricts the pupil.
: 15. A mild ptosis in a young person may be caused by a GVE disturbance whereas a frank ptosis is caused by GSE disturbance. True? Mild ptosis results from sympathetic denervation (innervation of the superior tarsal muscle?). Uncertain of frank ptosis (GSE would be levator palpabrae superioris via oculomotor?)
: 16. Sneezing while looking at bright light is thought to be, in part, mediated by the GSA component of the trigeminal nerve. True.
: 17. The infraorbital nerve, while in the infraorbital canal, carries non-native postganglionic GVE fibers en route to the lacrimal gland. False- carried on zygomaticotemporal nerve.
: 18. The lacrimal nerve proper is GSA only and does not mediate . lacrimation. True
: 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- so these fibers jump ship the zygomaticotemporal?
: 20. The extraocular muscles, with the exception of the superior oblique, are innervated by SVE fibers. False- all GSE.
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