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NEURO > Anatomy of the Eyeball > Flashcards

Anatomy of the Eyeball Flashcards

1
Q

What are the 3 layers of the eyeball?

A

Fibrous coat
Vascular coat
Sensory coat (retina)

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2
Q

2 parts of the fibrous coat of the eyeball?

A

Sclera (posterior 5/6ths)

Cornea (anterior 1/6)

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3
Q

3 components of the vascular coat of the eyeball?

A

Choroid

Ciliary body

Iris

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4
Q

Where does the retina end? What is this called?

A

At the “equator” of the eyeball

Called the ora serrata

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5
Q

What do the extrinsic muscles of the eyeball attach to?

A

The fibrous coat

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6
Q

Why are the cornea and lens of the eyeball transparent while the sclera is white & opaque?

A

Because the collagen fibres in the cornea and lens are regularly arranged while those of the sclera are not

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7
Q

Function of the choroid?

A

Supply blood to the outer layers of the retina

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8
Q

How many layers of the retina are there?

A

10

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9
Q

Functions of the ciliary body?

A
  1. Suspends the lens and contains muscle fibres that contract to change its shape
  2. Aqueous humor production
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10
Q

Function of the iris?

A

Control the diameter of the pupil

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11
Q

What is aqueous humor and where is it located?

A

Watery fluid in the eyeball

located in front of the lens (anterior compartment)

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12
Q

What is vitreous humor and where is it located?

A

Gel like fluid in the eyeball

Located behind the lens

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13
Q

What is the shape of the lens?

A

Bi-convex

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14
Q

What are the suspensory ligaments of the eyeball called? How much of the lens do they attach to?

A

Zonules

The full circumference of the lens is attached to zonules

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15
Q

What is the intraocular pressure? What determines this pressure?
Normal intraocular pressure value?

A

The fluid pressure within the eye

Determined by aqueous humor production/reabsorption

about 21mmHg

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16
Q

Effect of the vitreous humor on the retina?

A

Exerts a tamponade pressure on the retina to make sure it remains attached to the choroid

17
Q

Divisions of the anterior segment of the eye and where they are located?

A

Anterior chamber - in front of the iris

Posterior chamber - behind the iris

18
Q

Pathway of aqueous humor from production to drainage?

A
  • Produced in ciliary body
  • Moves into posterior chamber of anterior segment
  • Flows through pupil to anterior segment
  • Drains into the trabecular meshwork
  • Flows into Schlemms canal
  • Canal drains into episcleral veins
19
Q

What is the trabecular meshwork?

A

Aqueous humor drainage system at the angle of the anterior chamber

NEURO (52 decks)

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