Neuro-Ophthalmologist Flashcards Preview

MS2 - Nervous System > Neuro-Ophthalmologist > Flashcards

Flashcards in Neuro-Ophthalmologist Deck (18):
1

If you interrupt the sympathetic input, you get an abnormal __________ reaction.

dark (that is, the pupil won't dilate in the dark)

2

Interruption of the parasympathetic input results in _______________.

abnormal light reaction

3

Horner syndrome results in _____________.

small pupil and mild ptosis (baby ptosis)

4

Painful Horner syndrome can be _____________.

carotid artery dissection – extremely important because it can be stroke

5

Most of the axons that stimulate miosis are due to the __________ response.

near response (the light response only takes up about 10% of the fibers)

6

A disorder that leads to defective quadrants of the visual field are called _____________.

quadrantanopia

7

What does homonymous field defect mean?

That each eye has the same piece missing (e.g., both eyes cannot see the upper right quadrant)

8

Lesions to the ___________ produce "pie-in-the-sky" visual disturbances without affecting the central focus.

inferior occipital

9

Learn the retinotopy of the occipital cortex.

Imagine a small circle at the center of the visual divided into quadrants: 1 is UL, 2 is LL, 3 is UR, and 4 is LR. The quadrants are represented on the opposite hemisphere, and on the opposite side of the calcarine sulcus (so 1 – the UL – is on the right hemisphere inferior to the calcarine sulcus). The smallest number ism most superficial (so 1 is superficial) and then count up by 4s (so 5 is deep to 1 and 9 is deep to 5).

10

Afferent pupillary defects must occur in the axons of ____________.

cells prior to the LGN

11

The most important question to ask in a double-vision case is _______________. Later ask which directions make the diplopia worse or whether it's worse with neat or far objects.

"is it present when one eye is closed?"

12

Physiologic anisocoria is less than __________.

1.0 mm

13

The _____________ muscle is innervated by the sympathetic nervous system and leads to dilation of the pupil.

radial iris

14

Where is the first-order neuron in the Horner-system pathway?

Hypothalamus to spinal cord

15

The superior oblique muscle moves the eye _____________.

down and intorsion

16

The inferior oblique muscle moves the eye ______________.

up and extorsion

17

Static downbeat nystagmus can result from what condition?

Arnold-Chiari with compression of the flocculonodular lobe

18

What is a tonic pupil?

An abnormally dilated pupil because of "a portion not wired up to the light reaction"; results from damage to ciliary ganglion that provides parasympathetic input; slow reaction to light – faster reaction to accommodation

Decks in MS2 - Nervous System Class (111):