CORNEA

Question 1

Comprises 10% of total weight of cornea

Answer 1

Cornea epithelium

Question 2

Corneal epithelium consisting of 5-6 layers of cells are joined together by tight junctions called ______

Answer 2

desmosomes

Question 3

corneal epithelium is attached to bowman’s membrane by ______

Answer 3

hemidesmosomes

Question 4

squamous cells w/ microvilli projecting at tear film trapping fluid thus prevent drying of cells

also acts as convex mirror

Answer 4

Epithelial or Surface cells

Question 5

middle cells of epithelium

Answer 5

Wing cells or Polyhedral

Question 6

inner cells which secrete and rest on 60-65 nm thick basement membrane

Answer 6

Columnar/Cuboidal or BASAL CELLS

Question 7

acellular homogenous, area,

less resistant to deformation, trauma & passage of foreign bodies or microorganisms

Answer 7

Bowman’s membrane

Question 8

avascular, but richly contain the sensory nasocilary nerves of CN5

consists of collagen fibrils, loosely adherent to each other

Answer 8

Corneal Stroma or Substancia proper

Question 9

fixed, long flat cells which produced the collagen materials

Answer 9

Keratocytes

Question 10

very strong layer impervious to air

it is strong enough to withstand up to 2 bars of pressure

Answer 10

Dua’s layer

Question 11

true, very elastic & resistant membrane which prevent corneal perforation

product of secretions of endothelium, acting as its basement membrane

can regenerate

Answer 11

Descemet’s membrane

Question 12

lines the descemet’s membrane bathed by aqueous

responsible for deturgescence

controlling influx of water from AH

Answer 12

Endothelium

Question 13

cell type of corneal epithelium

Answer 13

stratified squamous non-keratinized cells

Question 14

cells of corneal endothelium

Answer 14

flat mesothelial hexagonal cells - CUBOIDAL CELLS

Question 15

thickness of bowman’s membrane

Answer 15

12 um

Question 16

thickness of dua’s layer

Answer 16

6-15 um

Question 17

thickness of descemet’s membrane

Answer 17

10 um

Question 18

layer which has no capacity to regenerate

Answer 18

Bowman’s membrane

Question 19

has the 4 - 4.5% dry weight of cornea

Answer 19

mucopolysaccharides MPS

Question 20

far more serious damage than epithelium

causing marked and permanent swelling & loss of transparency

Answer 20

Fuch’s endothelial dystrophy

Question 21

clouding of vision accompanied by seeing colored haloes around lights

caused by edema resulting from HARD contact lens wear (deprived of O2)

Answer 21

Sattler’s veil