Conjunctiva Flashcards
Where is the conjunctiva adhered to on the globe
Adhered to the tarsal place from lid margins to limbus
The 6 parts of the conjunctiva
Marginal
Tarsal
Palpebral
Fornix
Bulbar
Limbal
Blood supply
Ophthalmic artery
The two layers of the conjunctiva
Epithelium
Stroma
Structure of the epithelium
Made up of non keratinised, stratified squamous cells
May contain goblet cells
Structure of stroma
Fibrous connective tissue
What does the stroma of the conjunctiva contain (4)
Blood vessels
Nerves
Lymphatic system
Accessory lacrimal glands (Krause and Wolfring)
Function of conjunctiva (6)
Prevents foreign bodies going behind the eye
Provides oxygen to cornea in closed eye
Hosts glands that make up tear components
Aids surface with allergy response & infection control
Goblet cells produce mucin and Krause & Wolfring produce serous fluid
Provides smooth movement of lids over cornea
Glands of Krause (2)
20-40 in upper fornix
6-8 in lower fornix
Glands of Wolfring (3)
5 in upper tarsal (none in lower)
No direct nervous control
Beneath is fibrous layer of collagen and elastin
Blood drainage: Superiorly
Supra orbital vein
Blood drainage: Inferiorly
Inferior palpebral vein and facial vein
Function: Marginal
Sweep tears across globe
Features: Marginal (7)
Non keratinised
5-6 layers
Basal cells = columnar
Superficial cells = squamous
No goblet cells
Very little stroma
Squared edge to move tears
Where does the marginal conjunctiva start
Orifices of tarsal gland
