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12 Cards in this Set
- Front
- Back
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What is the conjunctiva?
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-continuous with the skin of the eyelids -palpebral conjunctiva covers the inner surface of the eyelid -bulbar conjunctiva covers the surface of the eyeball -lined by stratified squamous epithelium, and contains goblet cells, which secrete the deepest, mucus, layer of tear film, which adheres to the surface of the globe. It is highly vascular. |
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What are the layers of the cornea?
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(1. conjunctiva) 2. Bowman’s membrane (basal lamina) 3. Thick transparent fibrous layer 4. Descemet’s membrane 5. Endothelium (inner lining of the cornea) |
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Where does cornea get its nutrients from? |
avascular, so nutrients and oxygen are obtained from the aqueous humour, and oxygen is also obtained from air |
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Where does the cornea join the sclera?
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cornea joins with the sclera at the point of the limbus; the sclera is vascular, but otherwise similar to the cornea
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What produces aqueous humour?
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produced by ciliary processes of ciliary body |
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Function of aqueous humour?
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provides nutrients for lens and cornea. It also maintains intraocular pressure (25mm.Hg), |
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What is vitreous humour? What produces it?
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-gelatinous, so has very loose connective tissue: contains water, hyalouronic acid and collagen |
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What helps prevent retinal detachment?
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The pressure from the vitreous humour |
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What is the retina?
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inner layer of the eyeball, it develops from the optic vesicle, which is an outgrowth of the diencephalon. It remains connected to the diencephalon via the optic nerve. It can be divided into two parts:
1. non-visual retina (lines the back of the ciliary body) 2. optic part of the retina |
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What is the choroid? What does
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pigmented, highly vascular layer, containing:
a. tapetum lucidum (inner layer, nearest retina): reflective and coloured, so increases sensitivity to poor light b. vascular layer: nutritive c. black/connective layer (outer layer, nearest sclera) |
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Function of CB
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produces aqueous humour and vitreous humour, and is involved in lens accommodation, as its muscle fibres stretch the lens into a flatter shape, allowing distant vision |
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