Vision (BIO 181-201) Flashcards Preview

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Flashcards in Vision (BIO 181-201) Deck (41)
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1

Conjunctiva

-thin, protective mucous membrane
-stratified columnar epithelium
-areolar connective tissue and goblet cells (mucous)

2

palpebral conjunctiva

lines eyelids
extends to cover eye except for cornea

3

bulbar conjunctiva

covers back of eye

4

lacrimal apparatus

-glads and ducts associated with them
-produces fluids and gets rid of excess fluid in a process

5

superior rectus

looks up
oculomotor nerve

6

inferior rectus

looks down
oculomotor nerve

7

lateral rectus

looks laterally
abducens nerve

8

medial rectus

looks medially
oculomotor nerve

9

superior oblique

eye rolls
looks down and laterally
trochlear nerve

10

inferior oblique

eye rolls
looks up and laterally
oculomotor nerve

11

cornea

covers iris
translucent

12

outer cornea

stratified squamos epithelia

13

middle cornea

collage fiber and fibroblasts

14

inner cornea

simple squamos

15

sclera

covers eye (not cornea)
outermost layer
white of eye
dense connective tissue
fibroblasts
collagen fibers
a bit rigid and firm
gives eyeball shape
protects inside structures
attachment for 6 extrinsic eye muscles

16

iris

pigmented with melanocytes
changes size of pupil
between cornea and lens
regulated amount of light
circular and radial smooth muscles

17

pupil

-hole
-black because you can see chorroid (has melanocytes)

18

pigmented retina

1 cell layer thick
next to chorroid

19

neural retina

sensory information
photoreceptors
neural layer

20

lens

proteins

21

crystallins

lens proteins
layers
translucent
cataracts appear when they precipitate

22

anterior chamber

anterior to lens
between cornea and lens
filled with aqueous humor

23

posterior chamber

anterior to lens
between iris and lens
filled with aqueous humor

24

aqueous humor

-always produced
-excess exits in canal of Schelmm to venus circulation (every 90 minutes)

25

vitreous chamber

back of eye
contains vitreous body

26

vitreous body

gel-like
maintains position of retina
formed as embryo
never replaced

27

Rods

sensitive to light
enable to see in low light
no color vision
light scatters in retina
not in macula lueta or fovea centralis

28

rod photopigment

bipolar photoreceptor cells

29

rodopsin

opsin and retinal
forms in dark
reacts to light

30

light and dark adaptation

in light, opsin and retinal break down and come together in the dark to form rodopsin

31

bleaching

going from dark room to light room
opsin and retinal break apart

32

cones

color vision
see sharply
come to point
one axon
need bright light
photoreceptor cells
modified bipolar neuron

33

Cone photopiments

react to light
retinal and opsin

34

iodopsin

blue opsin

35

chlorocruorin

green opsin

36

eryrhrocruorin

red opsin

37

fovea centralis

greatest density of cones

38

macula lutea

no rods, only cones

39

visual fiels

nasal or temporal vision field

40

nasal (central) half

enter eye, focus on temporal retina

41

temporal (peripheral) half

focus on nasal retina