The Iris

Question 1

Location: Anteriorly

Answer 1

Covered by the aqueous

Question 2

Location: Posteriorly

Answer 2

In contact with crystalline lens

Question 3

Location: Peripherally

Answer 3

Continues with ciliary body at iris root

Question 4

Dimensions: Diameter

Answer 4

13mm

Question 5

Dimensions: Thickness at Root

Answer 5

0.1mm

Question 6

Dimensions: Thickness at Collarette

Answer 6

0.6mm

Question 7

Function (4 features)

Answer 7

• Controls the amount of light reaching retina
• Reduces aberrations (acts as a stop)
• Communicates emotion
• Provides a route for metabolites to and from the aqueous.

Question 8

Blood Supply

Answer 8

Major arterial circle in ciliary body

Question 9

Nerve Supply: Motor

Answer 9

Innervation from oculomotor nerve - CN3

Question 10

Waste Product Removal

Answer 10

Follows path back to ciliary body and then drains into ciliary veins or vortex veins

Question 11

Layers: Anterior

Answer 11

Anterior Border Layer

Question 12

Layers: Middle

Answer 12

Stroma

Question 13

Layers: Posterior

Answer 13

Epithelium

Question 14

Another word for: Dilation

Answer 14

Mydriasis

Question 15

Another word for: Constriction

Answer 15

Miosis

Question 16

Pupil reflexes occur in what situations (4 points)

Answer 16

Pain

Accommodation

Retinal Illuminance

Emotion

Question 17

Iridodonesis

Answer 17

Iris tremor - occurs when lens missing or displaced so iris not supported.