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CLO > Conjunctiva > Flashcards

Conjunctiva Flashcards

1
Q

Where is the conjunctiva adhered to on the globe

A

Adhered to the tarsal place from lid margins to limbus

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2
Q

The 6 parts of the conjunctiva

A

Marginal

Tarsal

Palpebral

Fornix

Bulbar

Limbal

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3
Q

Blood supply

A

Ophthalmic artery

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4
Q

The two layers of the conjunctiva

A

Epithelium

Stroma

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5
Q

Structure of the epithelium

A

Made up of non keratinised, stratified squamous cells

May contain goblet cells

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6
Q

Structure of stroma

A

Fibrous connective tissue

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7
Q

What does the stroma of the conjunctiva contain (4)

A

Blood vessels

Nerves

Lymphatic system

Accessory lacrimal glands (Krause and Wolfring)

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8
Q

Function of conjunctiva (6)

A

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

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9
Q

Glands of Krause (2)

A

20-40 in upper fornix

6-8 in lower fornix

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10
Q

Glands of Wolfring (3)

A

5 in upper tarsal (none in lower)

No direct nervous control

Beneath is fibrous layer of collagen and elastin

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11
Q

Blood drainage: Superiorly

A

Supra orbital vein

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12
Q

Blood drainage: Inferiorly

A

Inferior palpebral vein and facial vein

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13
Q

Function: Marginal

A

Sweep tears across globe

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14
Q

Features: Marginal (7)

A

Non keratinised

5-6 layers

Basal cells = columnar

Superficial cells = squamous

No goblet cells

Very little stroma

Squared edge to move tears

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15
Q

Where does the marginal conjunctiva start

A

Orifices of tarsal gland

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16
Q

Function: Tarsal

A

Provide oxygen to cornea in closed eye condition

17
Q

Features: Tarsal (6)

A

Non keratinised

2-3 layers

Surface cells = columnar

Few goblet cells

Little stroma

A lot of blood vessels for closed eye

18
Q

Function: Palpebral

A

Host accessory glands

19
Q

Features: Palpebral (4)

A

More goblet cells

Thicker stroma & glandular layer

Rich blood supply

Hosts Krause and Wolfring

20
Q

Features: Fornix (4)

A

Max goblet cells

Produces mucin

Superiorly fibrous layer continuous with levator muscle

Inferiorly continuous with rectus muscle

21
Q

Features: Bulbar (3)

A

Double layer of epithelial cells

Number of goblet cells decrease

Stroma thins & blends with tenon’s capsule - firmly attached to limbus

CLO (13 decks)

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