Conjunctive And Eyelids Flashcards
Regions of conjunctiva
Marginal conjunctiva
Tarsal conjunctiva
Palpebral conjunctiva
Conjunctival fornix
Bulbar conjunctiva
Limbal conjunctiva
Conjunctiva functions
Prevents foreign bodies
Provides oxygen when eyes are closed
Smooth lubricated movements of lids
Gross structure of conjunctiva
Two main layers; Epithelium (non-keratinised) and Stroma (fibrous connective tissue)
Marginal conjunctiva
Non-keratinised
5-6 layers
No goblet cells
Squared edge to sweep tears across the eye
Tarsal conjunctiva
Non-keratinised
2-3 layers
Many blood vessels to supply nutrients when lids are closed
Palpebral conjunctiva
Increased goblet cells
Accessory glands of Krause and Wolfring
Rich blood supply
The fornix (conjunctiva)
Max. Concentration of goblet cells (mucin for tears)
Superior lid; fibrous layer continuous with sheath of levator muscle
Inferior lid; fibrous layer continuous with inferior rectus
Bulbar conjunctiva
Double layer of epithelial cells
Goblet cells decrease
Stroma thins and blends with tenon’s capsule
Attaches the eye to close conjunctival sac
Limbal conjunctiva
No goblet cells
Epithelium blends into corneal epithelium
Fold under surface
Firmly bids the conjunctiva to the eye
Conjunctiva blood supply
Ophthalmic artery
Upper lid; marginal/peripheral palpebral arcades
Lower lid; marginal arcades
Conjunctival drainage
Superiorly; veins drain into supra orbital vein
Inferiorly; drain into inferior palpebral vein then into facial vein
Eyelid function
Protect cornea
Provides some constituents of tear film
Moves tears
Supports eye position
Eyelid function
Protect cornea
Provides some constituents of tear film
Moves tears
Supports eye position
Lid margins
Approx. 2mm wide and 30mm long
Two portions; ciliary and lacrimal regions
Tissue structure of eyelids
Skin
Muscle
Fibrous layer
Conjunctiva
