CHAPTER 14- Ocular anatomy and physiology Part 2 (2)

Question 1

How do electrical signals leave the retina?

Answer 1

The electrical signals leave via ganglion cell axons, which make up the optical nerve.

Question 2

There are 2 major blood vessels that occur within the optic disc. What are they and what do they do?

Answer 2

1- Central retinal artery (CRA)

2- Central retinal vein (CRV)

These supply and drain blood to and from the retina

Question 3

What is the macula region?

Answer 3

The region where there are no blood vessels

Question 4

Where is the region which has the most densely packed photoreceptors and what does this result in?

Answer 4

The fovea. As a result, the fovea has the highest acuity vison.

Question 5

The ocular adnexa incorporate those parts of the orbital region that are outside of the eyeball, including:

Answer 5

1- Extraocular muscles (eye movement)

2- Eyelids (spreading of tear film)

Question 6

What does the extraocular muscles include?

Answer 6

Includes six sets of skeletal muscles which can produce a range of eye movements.