Conjunctiva Flashcards
What is the function of the conjunctiva
Protection and lubrication fot the eye
What are the three parts of the eye
Palpebral conjunctiva
Conjunctival fornices
Bulbar conjunctiva
Where does the palpebral conjunctiva line
Lines the under surface of the top and bottom eyelids
What are the three portions the palpebral conjunctiva is divided into
Marginal
- transitional zone between eyelid and conjunctiva proper
Tarsal
- Posterior to tarsal plate of eyelid
Orbital
- Coverse between the tarsal plate and fornix
What are the charasterstics of the tarsal layer
Thin and highly vascular, thus inner surface of eelid appears pinkish red
Underlying tarsal glands are also visible thr transparent tarsal conjunctiva as vertical parallel streaks
Which layer can easily get accumulated with fluid
Bulbar conjunctiva
give a description of the conjunctival fornices
A fold lining the conjunctival sac (allows free movement of the eyeball) formed by palpebral and bulbar conjunctiva
What constitutes the conjunctival structure
Epithelium
Stroma
Where is the epithelium (conjunctiva) thinnest and thickest and which structures are it continuous with
Extermelly thin behind tasal, increase in layers at limbus and is continous with corneal epithelium
Continous with epidermis of skin or eyelid at the edge of marginal conjunctiva
What does the epithelium (conjunctiva) consist of
Non- keratinised epithelium and goblet cells
Where are goblet cells more and least
Zero cells at limbus and marginal conjunctiva
Maximum at conjunctival fornix
What is the function of goblet cells
Secretes mucin laye of the tear film
Describe the limbus
has a corrugated under surface (palisades of Vogt)
What is the limbus filled with
Fine blood vesels, nerves and lymphatics in the papillae of stroma at limbus
Where is the conjunctival stroma thinnest and thickest
VIrtually absent at marginal conjunctiva
Extremely thin over the tasal conjunctiva, thickens beyond the edge of tarsal plate
Thinner at bulbar conjunctiva