Normal eye anatomy and Aqueuous humor pathway Flashcards Preview

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Flashcards in Normal eye anatomy and Aqueuous humor pathway Deck (24)
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1

tunics of the eye?

1. retina (inner)
2. uvea or vascular (middle)
3. fibrous tunic (outer)

2

eye segments

anterior and posterior (vitreous chamber) segment

3

posterior eye segment

vitreous chamber

4

anterior eye segment is divided to

anterior and posterior chamber

5

fibrous tunic is divided to

sclera and cornea

6

uvea tonic is divided to

iris - ciliary body - choroid

7

retina is divided to

pigmented layer and neural layer

8

vascular arcades of retina

retinal artery
retinal vein

9

retinal - in the central of macula ?

Fovea

10

vessels that perforate into eye with optic nerve

central retinal vein
central retinal artery

11

The central retinal artery branches off the

ophthalmic artery (from internal carotid artery)

12

ciliary muscle contraction - receptors

M3

13

ciliary epithelium - function (and control by)

nonpigmented epithelium of ciliary --> body produces aqueous humor (decreases by β-blocker, α2-agonists and carbonic anhydrase inhibitors)

14

dilator muscle of iris - receptor

a1

15

splinter muscle of iris- receptor

M3

16

trabecular meshwork function

collects aqueous honor that flows through anterior chamber --> canal of Schlemm

17

ciliary muscle function

control accommodation

18

vision accommodation (adaptaing to short range focus) mechanism

ciliary muscle contraction --> releases the tension (relaxation) on the lens caused by the zonular fibers --> lens becomes more spherical --> adapts to short range focus.

19

aqueous humor outflow

- Trabecular flow (90%) --> drainage through trabecular meshwork --> Canal of Schlemm --> episcleral vasculature
- Uveoscleral outflow (10%) --> drainage into uvea and sclera

20

α1 - agonists effect on aqueous humor

decrease aqueous humor synthesis via vasoconstriction

21

β - blockers effect on aqueous humor

decrease humor synthesis (ciliary epithelium has β receptors)

22

acetazolamide effect on aqueous humor

decrease humor synthesis via inhibition of carbonic anhydrase

23

prostagladin effect on aqueous humor

increase uveoscleral outflow

24

Ophthalmoscopy (funduscopy) - how to identify left and right eye

the macula is in the center of the image, and the optic disk is located towards the nose