unit 8: special senses, eye (1) Flashcards

1
Q

the fibrous coats of the eye are derived from the ___, while the lens, retina, choroid and pigmented layers are derived from the ___

A

mesoderm

ectoderm

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2
Q

the __ tunic is outermost, and contains the sclera & cornea

A

fibrous

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3
Q
  • thick, dense, frim, opaque white part of fibrous tunic that maintains shape if pressure INSIDE eye INCREASES
  • extraocular muscles attach here
A

sclera

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4
Q

tiny openings in sclera allow __ __ and __ to pass through

A

BV

neurons

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5
Q
  • anteriorly, sclera transitions to the cornea at the __ and is lined with ___
  • posteriorly, it is continuous w/ fibrous sheath covering CN __
A

limbus
conjunctiva
II

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6
Q

clear, transparent anterior part of fibrous tunic that is the primary REFRACTORY part of the eye, and is convex antiorly

A

cornea

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7
Q
corneal epi
anterior limiting lamina
substantia propria
posterior limiting lamina
endothelium
--five layers (ANT to POST) that make up the \_\_\_
A

cornea

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8
Q

__ __, within the cornea, is continuous with the conjunctiva

A

corneal epi

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9
Q

largest part of the cornea is the __ ___

A

substantia propria

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10
Q

endothelium covers the inside surface of the cornea and lines the ___ layer

A

iridocorneal

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11
Q

the vascular tunic is made up of these three things

A

choroid
ciliary body
iris

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12
Q

part of vasc tunic that is thin with a rich blood supply, the vessels of which are heavily supplied by autonomic, vasomotor fibers and may have a coolin effect

A

choroid

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13
Q

the choroid of the vasc tunic is loosely attached to the ___, except where optic nerve penetrates, at which point it is firmly attached

A

sclera

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14
Q

the choroid of vasc tunic is __ __ in order to limit passage of light thru sclera to retina as well as thru retina to sclera

A

darkly pigmented

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15
Q

part of vasc tunic continuous w/ the choroid posteriorly and the iris anteriorly, that suspends the lens

A

ciliary body

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16
Q

ciliary body of vasc tunic produces aqueous fluid in anterior segment of eye as well as some ___ of the vitrous body

A

GAGs

17
Q

the ciliary muscle, contained in the ciliary body, contracts to allow lens to become more ___, allowing for ___ vision

A

convex

near

18
Q
  • colored part of eye that divides the anterior segment into anterior and posterior chamber
  • made up of sphincter pupillae and dilator pupillae
A

iris

19
Q

__ __ muscle in iris contains fibers circumferentially arranged that CONSTRICT the pupil
-innervated by ____ fibers

A

sphincter pupillae

parasymp

20
Q
  • __ __ muscle in iris causes pupil to become larger when it contracts
  • innervated by __ fibers
A

dilator pupillae

sympathetic

21
Q

nervous tunic (RETINA) is an outgrowth of the ___ and is a thin layer in contact with the ___ posteriorly and the ___ body internally

A

diencephalon
choroid
vitreous

22
Q

from external to internal:

  • pigmented layer
  • rods and cones
  • external limiting membrane
  • outer nuclear layer
  • outer plexiform layer
  • inner nuclear layer
  • inner plexiform layer
  • ganglion cell layer
  • nerve fiber layer
  • internal limiting membrane
A

retina layers

23
Q

vision pathway

1) ____: rods and cones synapse with
2) inner nuclear layer, ___ cells relay info to:
3) ganglionic layer, ___ cells carry info to:
4) lateral geniculate body, ___ here form optic radiation to synapse in:
5) brodmann area __ of occipital love

A
photoreceptors
bipolar
multipolar
axons
17
24
Q

two retinal structures visible upon fundoscopic exam are the __ __ and __ __

A

optic disc

macula lutea

25
Q
  • retinal structure that is the point where the optic nerve attaches to the eyeball, appears white/yellowish
  • deviates to nasal side of eye
A

optic disc

26
Q

the optic disc contains NO ___ but major BV enter the eyeball

A

photoreceptors

27
Q

retinal structure that is a darker area in the center of the fundus, cones are the only photoreceptors here

A

macula lutea

28
Q

__ __ is in the center of the macula lutea, and is the area of clearest vision

A

fovea centralis