Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
How many axons in the ON
|
1.2 million
|
|
|
ON diameter in the fundus and after passing lamina cribrosa
|
1mm in fundus, 3mm after passing lamina cribrosa due to myelin addition
|
|
|
Oligodendroglia begin where
|
Lamina cribrosa
|
|
|
Nerve fiber layer is how thick?
|
200 microns
|
|
|
What is the cause of ON swelling?
|
Not true edema b/c not extracellular
usually axoplasmic stasis = dilated axons |
|
|
Ischemic optic neuropathy caused by lesion where?
|
post ciliary arteries (off ophthalmic artery ->sup or inf)
have penetrating branches to ON head |
|
|
ON hypoplasia sign
|
double ring sign
sclera ring around optic nerve |
|
|
What is the cause of ON hypoplasia
|
abnormal pruning
|
|
|
Inf vf defects in kids caused by what
|
ON hypolasia in kids of diabetic mom
|
|
|
Demorsiers syndrome
|
micky-mouse sign - absense of septum pellucidum
must rule out pituitary abnormalities |
|
|
What to rule out in ON hypoplasia
|
tumors
Demorsiers syndrome diabetic mom |
|
|
Tilted disc key feature
|
associated with pseudobitermporal hemianopias - do not respect vertical
segmental nasal hypoplasia |
|
|
Morning Glory disc anomaly association
|
encephaloceles
moyamoya |
|
|
Optic nerve colobomas found where?
|
inferiorly
|
|
|
ON Coloboma/hypoplasia -> rule out what
|
basal encephalocele
brain tissue herniating into a sinus |
|
|
Optic disc drusen are what and what does it mimic?
|
hilum bodies on optic nerve
mimics papilledema |
|
|
ON drusen association
|
Retinitis pigmentosa
|
|
|
Papilledema implies what
|
elevated intracranial pressure, usually bilateral
|
|
|
Pseudotumor cerebri most common presentation (4)
|
headaches
also transient visual obscurations venous-soufle 6th nerve palsy |
|
|
Dandy Criteria for dx of pseudotumor cerebri (3)
|
Elevated Intracranial Pressure
Normal Imaging Normal neuro exam |
|
|
Med causes of psuedotumor cerebri (4)
|
Vit A
tetracyclines human growth hormone maladixic acid |
|
|
How to monitor Pseudotumor cerebri
|
VF testing
|
|
|
Treatment for pseudotomor cerebri
|
weight loss
diamox topamax |
