Conjunctiva - Regions (M2)

Question 1

what does mucus contain

Answer 1

mucin
water
epithelial cells
dead leukocytes
inorganic salts

Question 2

what is the function of mucus

Answer 2

lubrication and protection of ocular surface

Question 3

3 regions of conjunctiva and what do they form

Answer 3

Form conjunctival sac.
- Palpebral conjunctiva
- Forniceal conjunctiva
- Bulbar conjunctiva

Question 4

location of palpebral conjunctiva

Answer 4

lines underside of eyelids

Question 5

regions of palpebral conjunctiva

Answer 5

marginal conjunctiva
tarsal conjunctiva
orbital conjunctiva

Question 6

location of marginal conjunctiva

Answer 6

present at eyelid margin.
forms mucocutaneous junction.
contains lid wiper region.

Question 7

location of tarsal conjunctiva

Answer 7

present in area of tarsal plate –> firmly adherent to tarsal plate which provides smooth tarsal surface

Question 8

location of orbital conjunctiva

Answer 8

present of edge of tarsal plate to the forniceal conjunctiva.
loose tissue that allows for free movement of the globe.

Question 9

function and location of forniceal conjunctiva

Answer 9

aka conjunctival fornix.
cul de sac that connects palpebral and bulbar conjunctiva.
- deepest laterally, extending posterior to the equator of the globe.
- not present medially (plica and caruncle present medially instead).
loose tissue that allows for free movement of globe

Question 10

function and location of bulbar conjunctiva

Answer 10

lines the anterior globe - covers anterior tenon’s capsule/sclera and eom insertions.
merges with tenon’s capsule and anterior sclera within 3 mm of cornea –> layers become continuous with cornea

Question 11

what are the 2 specialized areas of bulbar conjunctiva medially

Answer 11

plica semilunaris.
caruncle.

Question 12

location and function of plica semilunaris

Answer 12

cresent-shaped fold of bulbar conjunctiva.
allows full lateral movement of the eye without the tissue stretching.
makes up the floor of the lacrimal lake (tear reservoir).
contains high conc. of goblet cells.

Question 13

location and function of caruncle

Answer 13

mound of bulbar conjunctiva/skin:
- conjunctival elements: non-keratinzed epithelial cells, goblet cells, accessory lacrimal glands.
- skin elements: hair follicles, sebaceous glands, sweat glands.
overlies medial edge of plica.
function is poorly understood - hairs trap oil, mucus, debris