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Nervous System > Eye > Flashcards

Eye Flashcards

1
Q

Tunics of the eye

A

Outer fibrous tunic: sclera, cornea
Middle vascular tunic: iris, ciliary body, choroid
Inner neural tunic: retina

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2
Q

Sclera

A

posterior connective tissue, appears white, tendons of extrinsic eye muscles attach here

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3
Q

Cornea

A

transparent collagen, covers lens, refracts the light

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4
Q

Iris

A

contains blood vessels & pigmented cells
smooth muscle that contracts diameter of pupil
-circular pupillary (constricts)
-radial pupillary (dilates)

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5
Q

Pupil

A

opening that allows light to enter posterior eye

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6
Q

Choroid

A

capillary network brings blood supply to retina

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7
Q

Ciliary Body

A

smooth muscle that attaches to suspensory ligaments

changes shape of lens

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8
Q

Suspensory Ligaments

A

attach to lens and change its shape during visual accommodation

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9
Q

Lens

A

organized layer of connective tissue cells, refract light to focus visual image on retina

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10
Q

Retina

A

entends anteriorly to ora serrata, contains photoreceptors

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11
Q

Rods

A
  • very light sensitive (night vision)
  • grainy images
  • black and white
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12
Q

Cones

A
  • requires adequate light (day vision)
  • sharp clear images
  • detect color
  • three types of cones
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13
Q

Fovea centralis

A

Focus point, contains highest concentration of cones for sharpest vision

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14
Q

Blind spot

A

where optic nerve leaves the eye

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15
Q

Posterior cavity

A

from lens to iris, filled with vitreous humor

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16
Q

anterior cavity

A

from lens to cornea, filled with aqueous humor

17
Q

Conjunctiva

A

venous epithelium covering anterior sclera and inner eyelid, lubricates and moistens eye

18
Q

Lacrimal apparatus

A

produces, distributes, and removes tears

19
Q

Lacrimal gland

A

produces 1 mL of tears a day

20
Q

Visual pathway

A 
photoreceptors
bipolar cells
ganglion cells
optic nerve
optic chiasm
optic tract
1/4 to superior colliculi of corpora quadrigemina(midbrain)
3/4 to thalamus
visual cortex of occipital lobe

Nervous System (6 decks)

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