Exam (elaborations)
MCPHS Anterior Seg Cornea Exam Questions And Accurate Answers
- Course
- Institution
MCPHS Anterior Seg Cornea Exam Questions And Accurate Answers...
[Show more]
Content preview
MCPHS Anterior Seg Cornea Exam Questions AndAccurate Answers
Corneal Innervation
Derived from ciliary nerves that penetrate cornea in deep peripheral stroma, lose
myelination shortly after entering cornea. Terminate in wing cells of epi
Cornea: Epithelium
surface layer, 55um, barrier function (block debris, bacteria, foreign), constantly
regenerated + sloughed
Cornea: Bowman's Layer
Basement membrane, 5um, prevents forward corneal swelling
Cornea: Stroma
Majority of the cornea, 485um, strength + elasticity
Cornea: Dua's Layer
Newly discovered, 10-15um, Unknown fxn
Cornea: Descemet's Layer
basement membrane, 10um, health of endothelial cell
Cornea: Endothelium
Innermost layer, 5um = 1 cell thick, barrier pump maintaining appropriate corneal
hydration
, Arcus Senilis
Degenerative change involving deposition of lipid in peripheral cornea. Gray/white arc
progresses into a ring with sharp peripheral border and diffused central border. Limbal
intervening zone.
Fish-Eye Disease
LCAT deficiency -- progressive arcus which begins in adolescence. May result in
complete opacification. Usually asymptomatic besides cosmesis.
Lipid Degeneration
Dense yellow-white opacity that may fan out with feathery edges. Deposits consist of
cholesterol, fats, phospholipids. Two types: (primary + secondary)
Spheroidal Degeneration
Clear to yellow-gold spherules seen in subepithelium, within Bowmans, or in superficial
corneal stroma. They may darken with age. Three types: (primary corneal involvement,
corneal involvement 2^ to underlying, conj involvement)
Amyloid Degneration
Groups of proteins with starch-like characteristics. Stains with Congo Red, birefingence
in polarized light, and dichromism in green light. Primary of secondary forms
Salzmann's Nodular Degeneration
Yellow-white to blue elevated lesions on cornea. Usually annular pattern in
mid-periphery. Adjacent to corneal scars or pannus. F>>M.
Terrien's Marginal Degeneration
Non-inflammatory peripheral thinning with pannus. White/grey band 1-2mm that starts
superonasally and spreads circumferentially. A gutter forms between opacity and
limbus (depression)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Chrisyuis. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now