neuro4a

Question 1

nucleus of CN 3 symptoms

Answer 1

bilateral ptosis and weakness of contralateral SR; failure of eye elevation

Question 2

Cn 3 lesion in the subarachnoid space

Answer 2

meningismus, constitutional symptoms, and other CN defects

Question 3

Tentorial edge compression

Answer 3

can cause a CN3 issue plue depresed level of consciousness, hemiparesis, and hitosy of trauma or supratentorial mass lesion

Question 4

CN4 muscle

Answer 4

SO that intorts and depresses the adducted eye

Question 5

CN4 lesion

Answer 5

oblique diplopia, worse on dow gaze when affected eye is adducted (diplopia when reading or going downstairs)

Question 6

contralateral head tilt

Answer 6

seen in patients with Cn4 palsy

Question 7

Cn6 innervates what muscle

Answer 7

LR,

Question 8

CN6 lesions

Answer 8

esotropia, esp on ipsalateral gaze

Question 9

most common causes of CN3 nerve dysfunction in older adults

Answer 9

microvascular occlusion and ischemia, associated with htn, DM, and atherosclerosis

Question 10

MLF (medial longitudinal fasciculus)

Answer 10

connects the contralateral abducens nuc and paramedian pontine reticular formation with the ipsilateral 3rd nerve nucleus