Exam 3: Eye Flashcards Preview

Anatomy A-215 > Exam 3: Eye > Flashcards

Flashcards in Exam 3: Eye Deck (43):
1

Palpebrae

-eyelids

2

External Landmark: Sclera

-whites of the eye

3

External Landmark: Cornea

-transparent center part in front of the iris

4

External Landmark: Iris

-pigmented part of eye

5

External Landmark: Pupil

-opening of iris

6

Conjunctiva

-lines sclera and eyelid
-function: secretes mucus as a lubricant

7

Conjuctivitis

-pink eye
-imflamed conjunctiva

8

Lacrimal Apparatus (function, structures, contents)

-produces/collects tears (lacrimal fluid)
-consists of lacrimal gland, lacrimal canaliculi, lacrimal puncti, and nasolacrimal duct
-contains water, sodium ions, antibodies (fight infections, lysozyme-antibacterial agent)

9

Lacrimal Gland

-produces and secretes tears

10

Lacrimal Canaliculi

-from lacrimal puncti to nasal lacrimal duct
-drain tears

11

Nasolacrimal Duct

-internal
-drains tears into nasal cavity, where they are eventually swallowed

12

Why do you get a runny nose when you cry?

-overproduction of tears overflows system

13

Medial Recuts

-moves eye medially (adducts)

14

Lateral Rectus

-moves eye laterally (abducts)

15

Superior Rectus

-elevates and moves eye medially (adducts)

16

Inferior Rectus

-depresses and moves eye medially (adducts)

17

Superior Oblique

-depresses (pupil moves inferiorly) and moves eye laterally
-attaches to superior posterior part of eye

18

Inferior Oblique

-elevates (pupil moves superiorly) and moves eye laterally
-attaches to inferior posterior part of eye

19

Website to help learn eye movements

anatomy.hsc.wvu.edu/ReillyDental/VirtualPatients/ExtraocularSkeletalMuscle.swf

20

Lens

-biconvex, transparent structure inside eyeball
-function: refracts light rays
-held in place by suspensory ligaments

21

Suspensory Ligaments

-actually change shape of lens due to what type of vision
How?
-when taut, make lens fatter for far vision
-when looser, make lens 'puffier' for near vision

22

Fibrous Tunic

-avascular
-made up of sclera and cornea

23

Sclera (Function)

-supports and maintains eye shape

24

Cornea (Structure)

-curved transparent structure anterior to iris and pupil

25

Vascular Tunic

-contains blood vessels to nourish eye
-consists of choroid, cilliary body, and iris (listed posterior to anterior)

26

Choroid

-dark brown membrane
-function: refracts light rays

27

Cillary Body

-ring of smooth muscle tissue that surrounds the lens
-attaches to lens via suspensory ligaments
-functions: changes pull on suspensory ligaments and secretes aqueous humor
-far vision: cilliary relaxes, suspensory tight
-near vision: cillary contract, suspensory loose

28

Aqueous Humor

-fluid very similar to CSF in composition and function
-brings nutrients in and removes waste
-drains into dural venous sinuses

29

Iris

-pigmented colored part of eye
-contains pupil
-function: constricts or dilates pupil to regulate amount of light entering eye

30

Retina

-converts light rays to nerve impulses
-consists of pigmented layer and neural layer

31

Pigmented Layer

-outer layer of retina adjacent to choroid
-function: absorb stray light rays

32

Neural Layer

-inner layer of retina
-function: its photoreceptors receive light information and convert it into nerve impulses that are sent, via CN II (optic nerve) to the brain
-2 types: rods and cones

33

Rods

-work in dim/low light
-image fuzzy not very sharp

34

Cones

-work in bright light, produce clear, sharp image
-perceive color

35

Glaucoma

-buildup of pressure in space containing aqueous humor
-1 cause: increased pressure in space-not draining properly (too much aqueous humor)
-can cause blindess

36

Optic Disc (Blind Spot)

-area where the optic nerve exists the eye
-contains no photoreceptors-only axons

37

Macula Lutea

-lateral to optic disc
-in center is Fovea Centralis

38

Fovea Centralis

-area of sharpest vision
-only cones (so needs light)

39

Anterior Cavity

-between cornea and lens
-filled with aqueous humor

40

Posterior Cavity

-between lens and retina
-contains vitreous humor

41

Vitreous umor

-gelatinous-helps maintain shape of eye
-not constantly made
-have same amount since birth

42

Pathway of Processing Visual Information

-light rays enter eye through cornea and are refracted
-light rays are further refracted by lens
-light rays focus on retina
-light ray information is converted to nerve impulses by photoreceptors
-nerve impulses transmitted to the brain via CN II (Optic Nerve)

43

LASIK Eye Surgery

-reshape cornea with laser