Review: Symp and PS, CN's

Question 1

olfactory nerve

Answer 1

• SVA= smell
• CN I, passes through cribiform plate.
• lesion can result from trauma to frontal portion of skull, or tumors of frontal lobe
• will cause anosmia/hyponosmia

Question 2

Components of optic n?

Answer 2

• SSA = for vision
• optin n. is completely invested in all layers of meninges, it is composed of axons of ganglion cells (third order neurons)
• ONLY n. completely invested in meninges

Question 3

Testing for CN II?

Answer 3

visual acuity, visual fields, pupillary light reflex

Question 4

pathologies of CN II?

Answer 4

• the first nerve to be affected by increased intracranial pressure: central retinal v. can be compressed and occluded
• demyleniation of optic n: CN II is susceptible to CNS demyelination pathologies, i.e. MS.
• ## Optic Neuritis: inflammation of optic n can be caused by MS, toxic substances, infections, diabetes.

Question 5

Occulomotor n.

Answer 5

• GSE- component to eye mm. (levator palpebrae and 4/6 of extraocc. eye mm.)
• GVE-P PS to ciliary mm. and sphincter pupillae m.
• nuclei are located in mesencephalon: Edinger-Wesphal nucleus