Uvea

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  • Created by: JackMuir2
  • Created on: 30-12-20 14:22
What is the diameter of the iris?
Around 13mm
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What is the region of the anterior iris that divides the iris into the 'ciliary' and 'pupillary' regions?
Collarette
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What is the range of pupil diameters?
1mm to 8mm
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What is dilation and constriction of the pupil called, respectively?
Mydriasis and Miosis
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In the iris during pupil constriction/dilation which zone's width alters the most?
Ciliary Zone
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What are Fuch's crypts?
Openings in the anterior iris that allow for the deeper layers of the iris to be bathed in aqueous humour
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What best describes the 'anterior border layer' of the iris?
No epithelium and features a dense covering of melanocytes
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Which muscle is contained within the iris stroma?
Sphincter Pupillae
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What are the dimensions of the sphincter pupillae?
Around 1mm wide and 0.1mm thick
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The iris epithelium is...?
A double epithelial layer that appears only on the posterior surface
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The iris epithelium appears black, why is this?
The whole whole layer is deeply pigmented
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What is the portion of the iris epithelium visible around the pupil called?
Pupillary Ruff
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What special feature of radial blood vessels in the iris allows them to move during mydriasis and miosis?
They have a spiral course
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Where are the arteries in the iris derived from?
From the MAC in the ciliary body
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Where are sensory nerves found in the iris?
In the iris root
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Which 'pupillae' muscle has primarily sympathetic innervation?
Dilator Pupillae
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Which 'pupillae' muscle has primarily parasympathetic innervation?
Sphincter Pupillae
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Where does the innervation for the sphincter and dilator pupillae muscles come from?
The Oculomotor (III) nerve, and cells in the Superior cervical ganglion, respectively
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The pars plicata of the ciliary body is...?
The further anterior portion which features many ridges
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Where are the Zones of Zinn located?
They run from the pars plana, pass through the ciliary processes and onto the lens capsule
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What is the supraciliaris
The outer layer of the ciliary body which lines the sclera
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Contraction of the ciliary muscle results in...?
Reduced tension on Zonules of Zinn and increase in the lens' dioptric power
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How many Ciliary processes are present on the pars plicata?
70 to 80
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The ciliary epithelium is....?
A double layer of cells extending from the iris root to the retina
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What are Desmosomes?
A cell structure specialised for cell to cell adhesion
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From where does the ciliary body receive its blood supply?
From the major arterial circle
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Venous drainage from the ciliary body is via the....?
Vortex veins posteriorly and the anterior ciliary veins (to a lesser extent)
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Where does the choroid lie?
It lines the sclera from the ora serrata to the edge of the optic disc
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How thick is the choroid?
Around 0.2mm
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What does the suprachoroid carry to the anterior urea?
Blood vessels and nerves
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What are the layers of different sized blood vessels in the choroidal stroma called?
Haller's Layer (large vessels) and Sattler's Layer (small vessels)
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What is not an unusual feature of the capillary beds in the choriocapillaris?
They supply nutrition AND remove substances from surrounding tissue
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What are the lumps of material, formed with age on the cuticular lamina by the RPE, known as?
Drusen
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How do the blood arteries and veins in the choroid change in size when the reach the capillary layer?
Drastically smaller
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Where do the veins in the choroid drain to?
To the posterior half of the globe, into the four vortex veins which eventually drain into the superior and inferior ophthalmic veins
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Other cards in this set

Card 2

Front

What is the region of the anterior iris that divides the iris into the 'ciliary' and 'pupillary' regions?

Back

Collarette

Card 3

Front

What is the range of pupil diameters?

Back

Preview of the front of card 3

Card 4

Front

What is dilation and constriction of the pupil called, respectively?

Back

Preview of the front of card 4

Card 5

Front

In the iris during pupil constriction/dilation which zone's width alters the most?

Back

Preview of the front of card 5
View more cards

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