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histology > eye > Flashcards

eye Flashcards

1
Q

sensory receptord

A

interface between the nervous system and the internal and external environemnt

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2
Q

general senses

A

temperature, pain touch, proprioception

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3
Q

special senses

A

small, taste, balance, hearing, vision

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4
Q

simplest receptors

A

free nerve ending

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5
Q

retina receptors

A

specific and only respond to light

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6
Q

receptive fields

A

receptors far apart and hard to localize stimulus

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7
Q

exteroceptors

A

information about the external environment

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8
Q

proprioceptors

A

inormation about body position

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9
Q

interoceptors

A

inforation about the inside of the body

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10
Q

eye accessory structures

A

-Palpebrae (eyelids)
-canthus (eyelid at corner)
-palbrae fissure (btwn eyelid)
-lashes
-conjunctiva (epithelial linning eye)
-glands

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11
Q

what triggers blink

A

root hair plexus

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12
Q

conjunctiva

A

inside linning eyelid
-produces fluid to keep wet
-ocular conjunctiva= outer
-palbral= inner

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13
Q

glands

A

protection or lube

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14
Q

glands of zeis

A

-sebacesous
-eyelashes

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15
Q

tarsals

A

-keep eyelid from sticking together w lipid rich product
-inner amrgin of eye

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16
Q

lacrimal gland

A

make tears

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17
Q

lacrimal carnumcle

A

-thick secretions
-canthus area

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18
Q

cyst

A

from infection of tarsals gland

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19
Q

sty

A

infection of any other gland

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20
Q

lacriminal apparatus

A

-lacrimal gland
-canaliculi
-sac
-nasolacriminal duct

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21
Q

tear flow

A

-made in lacrimal gland to the ocular surface then the nasolacrimal canal (foramen), enters nasal cavity (runny nose tears)

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22
Q

eye tunics

A

fibrous tunic, vascular tunic and neural tunic

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23
Q

posterioir cavity

A

vitreous fluid

24
Q

posterioir chamber

A

aqeuous fluid

25
Q

blind spot

A

optic disk
-there is no retina there

26
Q

eye layers

A

retina to choiroid to sclera

27
Q

fovea

A

only cones

28
Q

vascular tunics (MIDDLE)

A

choiroid and ciliar body and iris
-blood vessels, intrinsic and lymphatics
-regulate light entering eye
-secrete aqueous fluid
-accomodation
-pigment of eye

29
Q

fibrous tunic (OUTER LAYER)

A

cornea and sclera
-attach extraocular muscles

30
Q

nueral tunic

A

neural part (inner) and pigmented part (outer)
RETINA

31
Q

accomodation caused by

A

cilliary body contraction
-changes focal length to focus on diff diatances
-18 dioptres

32
Q

anterioir cavity

A

made of anterioir ad posteiroir chamber
-aqueous

33
Q

aqueous fluid enters through?

A

posterioir chamber and flows trough pupil area and enters through anterioir chamber through canal of schlemm and enters venous circulation

34
Q

canal of schlemm

A

maintain homeostasis by drainging aqueous fluid to systemic n.s.

35
Q

build up of fluid in schlemm

A

glaucoma

36
Q

detached retina

A

aquious fluid is not putting enough pressure against the retina

37
Q

vitrious fluid

A

support eye shape, lens, retina

38
Q

limbis stem cells

A

keep cornea functioning

39
Q

layers of the cornea

A

stratified squamous, stroma and posterioir epithelium

40
Q

lens

A

epithelium and laminated fibers
-has germinal zone, capsule, fibers
-no organelles bc would block light
-refracts light
-10mm diameter

41
Q

lens fibers

A

secondary anucleated
-terminal differentiation

42
Q

best color vision

A

fovea centralis

43
Q

optic nerve

A

cranial nerve 2

44
Q

do all fibers cross at the chiasm

A

no

45
Q

what regulates light enetering eye globe

A

iris whihc is in front of the eye

46
Q

what hold the lens

A

suspensory ligaments

47
Q

does the lense grow through life

A

yes

48
Q

lens parts

A

capsule, epithelium and fibers (fibers on anterioir)

49
Q

does the lense have nerves, bv or c.t

A

no

50
Q

crystaline lense capsuel

A

basement membrane completely surroinding it
-made of collagen 4 whihc is made by the epithelium

51
Q

lense epithelium

A

maintain homeostasis of pressure and everything
-nak pump and ions
-progineter for new lens fibers

52
Q

lens fiber

A

4-7 micro diameter and 12mm long
-honecomb
-new fibers get added to the outer cortex
-no organelles or nuc (denucleate)

53
Q

thickest base membrane in the body?

A

lens capsul

54
Q

lens if

A

64 water and 35 protein

55
Q

get nutrient

A

diffusion

histology (20 decks)

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