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vision Flashcards

1
Q

What is the orbit?

A

Cavity or socket of the skull which houses the eye

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2
Q

What is the function of the orbit?

A

Protects and stabilizes the eye

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3
Q

What is the superior orbital fissure?

A

Opening between lesser and greater wings of sphenoid bone

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4
Q

What is the function of superior orbital fissure?

A

Allows cranial nerves, arteries, and veins to communicate with eye

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5
Q

What is optic canal?

A

Foramen which the optic nerve passes to reach the brain

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6
Q

Definition of eye

A

Slightly irregular, hollow sphere

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7
Q

What are the three layers of the eye?

A

Fibrous, vascular, and inner layer

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8
Q

What is in the fibrous layer of the eye?

A

Dense avascular - sclera and cornea

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9
Q

What is in the vascular layer of the eye?

A

Choroid, ciliary bodies, iris

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10
Q

What is in the inner layer of the eye?

A

Fluids (vitreous and aqueous humor) - shape and retina

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11
Q

What are the functions of sclera?

A

Protects eye and gives shape

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12
Q

What is sclera?

A

Is the white portion of the eye and is tough

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13
Q

What is the pupil?

A

Opening in center of eye

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14
Q

What is neurological function?

A

Pupils’ reaction to light

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15
Q

Where is iris located in the eye?

A

Between cornea and lens (colored part of the eye)

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16
Q

What is the function of the iris?

A

Contract and relax muscle and controls light levels inside eye

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17
Q

What are the muscles in iris?

A

Sphincter and dilator muscle

18
Q

What is sphincter muscle?

A

Circular and contracts

19
Q

What is dilator muscle?

A

Radial and dilates

20
Q

What are the muscles of the eye?

A

Medial rectus, lateral rectus, superior rectus, inferior rectus, superior oblique, inferior oblique

21
Q

What is inferior rectus important for?

A

Depression, downward rotation, adduction

22
Q

What is superior rectus important for?

A

Elevation and upward rotation

23
Q

What is medial rectus important for?

A

Strongest muscles and adduction - towards the nose

24
Q

What is lateral rectus important for?

A

Abduction

25
Q

What is inferior oblique important for?

A

Elevation, adduction, and rotation of globe. Keeps the eyeballs level as head tilts.

26
Q

What is superior oblique important for?

A

Abduction, depression, rotation of globe. Keeps the eyeballs level as head tilts.

27
Q

What muscles is the oculomotor?

A

Inferior rectus, superior rectus, medial rectus, and inferior oblique

28
Q

What muscle is the abducens?

A

Lateral rectus

29
Q

What muscle is trochlear?

A

Superior oblique

30
Q

What is conjunctiva?

A

Transparent thin mucous membrane that covers the outer surface of the eye

31
Q

What is the function of conjunctiva?

A

Secretes oils and mucous that moisten and lubricates the eye

32
Q

Where is palpebral conjunctiva?

A

Lines eyelid

33
Q

Where is bulbar conjunctiva?

A

Anterior surface of eyeball

34
Q

Where is conjunctival sac?

A

Slit like space between the eyeball and eyelid

35
Q

What is cornea?

A

Transparent, dome-shaped window covering the front of the eye

36
Q

What is the function of the cornea?

A

Extremely sensitive and bends light in the eye

37
Q

What is the corneal reflex - blink reflex

A

Involuntary blinking of the eyelids elicited by stimulation of the cornea, or bright light

38
Q

What has no blood vessels?

A

Cornea

39
Q

What has a lot of blood vessels?

A

Choroid

40
Q

Where is choroid located?

A

Posterior opening for the optic nerve and dark brown membrane

41
Q

What is the vitreous humor

A

Holds retina in place via increased pressure

42
Q

What is aqueous humor?

A

Forms by filtration from capillaries in ciliary processes

Flashcards (55 decks)

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