Conjunctiva Flashcards

1
Q

What is the function of the conjunctiva

A

Protection and lubrication fot the eye

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2
Q

What are the three parts of the eye

A

Palpebral conjunctiva

Conjunctival fornices

Bulbar conjunctiva

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3
Q

Where does the palpebral conjunctiva line

A

Lines the under surface of the top and bottom eyelids

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4
Q

What are the three portions the palpebral conjunctiva is divided into

A

Marginal
- transitional zone between eyelid and conjunctiva proper

Tarsal
- Posterior to tarsal plate of eyelid

Orbital
- Coverse between the tarsal plate and fornix

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5
Q

What are the charasterstics of the tarsal layer

A

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

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6
Q

Which layer can easily get accumulated with fluid

A

Bulbar conjunctiva

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7
Q

give a description of the conjunctival fornices

A

A fold lining the conjunctival sac (allows free movement of the eyeball) formed by palpebral and bulbar conjunctiva

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8
Q

What constitutes the conjunctival structure

A

Epithelium
Stroma

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9
Q

Where is the epithelium (conjunctiva) thinnest and thickest and which structures are it continuous with

A

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

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10
Q

What does the epithelium (conjunctiva) consist of

A

Non- keratinised epithelium and goblet cells

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11
Q

Where are goblet cells more and least

A

Zero cells at limbus and marginal conjunctiva

Maximum at conjunctival fornix

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12
Q

What is the function of goblet cells

A

Secretes mucin laye of the tear film

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13
Q

Describe the limbus

A

has a corrugated under surface (palisades of Vogt)

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14
Q

What is the limbus filled with

A

Fine blood vesels, nerves and lymphatics in the papillae of stroma at limbus

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15
Q

Where is the conjunctival stroma thinnest and thickest

A

VIrtually absent at marginal conjunctiva

Extremely thin over the tasal conjunctiva, thickens beyond the edge of tarsal plate

Thinner at bulbar conjunctiva

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16
Q

What is the conjunctival blood supply for palpebral conjunctiva and conjunctival fornix

A

Palpebral arcades
- peripheral and marginal tarsal arcades

Anterior ciliary arteries

17
Q

What is the conjunctival blood supply for bulbar conjunctiva

A

Posterior conjunctival arteries anastomose with anterior conjunctival arteries

18
Q

What is the cranial nerve that supplyies the conjunctiva

A

Sensory innervation from opthalmic and maxillary division of trigeminal nerve CN V

19
Q

What nerve innervates the bulbar conjunctiva

A

Long ciliary nerves

20
Q

What nerve innervates the superior and inferior palpebral conjunctiva and conjuntiva foirnix

A

Superior conjunctival fornix and palpebral conjunctiva
- lacrimal nerve
- frontal nerve

Inferior conjunctival fornix and palpebral conjunctiva
- lacrimal nerve and infraorbital nerve