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19 Cards in this Set

  • Front
  • Back
1. What do you call the tight junction that forms a zone or belt around the entire cell and joins it with each of the adjacent cells?
zonula occludens
In what type of intercellular junction are the plasma membranes separated by a narrow intercellular space that contains a specific glycoprotein cell adhesion molecule that contributes to cell stability and adhesion?
zonula adherens
What are the two names for the round button like intercellular junctions
macula occludens or macula adherens
A. What is the radius of curvature of the cornea? of sclera?
8mm=corneal radius of curvature
12mm=scleral radius of curvature
B. When viewed from the front, what is the vertical corneal diameter? horizontal corneal diameter?
B. vertical corneal diamter=11mm
C. horizontal corneal diameter=12mm
What is the central corneal thickness? peripheral corneal thickness?
central corneal thickness=0.53mm, peripheral corneal thickness=0.71mm
What do you call the fine ridges on the surface of corneal epithelial cells that enhance the stability of the tear film?
ridgelike projections-microplicae
fingerlike projections-microvilli
What are the three types of cells that make up the corneal epithelium?
1) Surface cells
2) Wing Cells
3) Basal Cells
What are the three types of cells that make up the corneal epithelium?
1) Surface Cells
2) Wing Cells
3) Basal Cells
What is the posterior shape of corneal epithelial wing cells, posterior shape?
posterior concave, anterior convex
In what corneal layer does keratoconus first present?
usually central focal disruptions in the basement membrane and Bowman's layer, folds in the posterior stroma and Descemet's occur next
What is the thickness of the corneal epithelium in realtion to the other layers?
50 microns, 10% of total corneal thickness
What is the thickness of Bowman's membrane?
8-14 microns
What is the thickness of the corneal stroma in relation to the other corneal layers?
90% of entire corneal thickness, 470 microns
What are stromal lamellae made up of
coaxial bundles of collagen fibers that lie parallel to each other that extend the entire length of the cornea and are held in place by mucopolysaccharides and glycoproteins.
Would the orientation of the fibrils in picture c or d be an example of a transparent cornea?
picture c because the fibrils are equally spaced allowing for scattered light to be eliminated by destructive interference according to Maurice.
How many microns thick is each corneal lamellae?
2 microns
How thick is Descemet's membrane?
fetal Descemet's is approximately 5 microns but by age 40 Descemet's is up to 15 microns