Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
UB ANA 113 Lec 19
The Visual System
| Question | Answer |
|---|---|
| orbit | Protection for the eyeball. Frontal and maxillary bones are major components. |
| eyebrow | Protect eyes from dust. Oil glands on hair continuously produce and trap dust. |
| eyelid, eyelashes | Protect Eye from dust. Blinking keeps front of eye clean and moist. Ex. You blink more in a smoky/dusty environment. |
| conjuctive | Thin transparent membrane that secretes clear mucous. On Back of eyelid and anterior surface of eyeball |
| conjunctivitis | bacterial infection of conjunctiva. "Pink eye" - blood vessels of sclera dialate to kill bacteria, eye looks pink |
| lacrimal gland | -produces tears -upper lateral portion of orbit -Controlled by facial nerve (7th cranial) |
| nasolacrimal duct | -collects tears -between eye and lateral wall of nasal cavity |
| extrinsic muscles of the eye | voluntary movement of the eyeball |
| How many (main) layers does the eyeball have? | 3 - Outer, Middle(vascular), and inner |
| What is in the outermost layer of the eyeball? | sclera and cornea |
| sclera | OUTER LAYER -white part of eye -tough outermost cover = fibrous -protects inner structures of eye -contains blood vessels |
| cornea | OUTER LAYER -multilayered -transparent -normally no blood vessels but if you scratch it they will grow in and never leave |
| choroid | MIDDLE LAYER -blood vessels supplying interior eyeball |
| ciliary body | MIDDLE LAYER - moves and changes shape of lens - has smooth muscle |
| iris | MIDLE LAYER - color portion - changes size of pupil to protect retina from strong light |
| How Many layers does the retina have? | 10 Major |
| pigmented layer ... where? | INNER EYE -of the retina |
| nervous layer ... where and how many | INNER EYE -of the retina -9 layers |
| rods and cones - function | where the impulse is initially detected |
| bipolar cells - L and F | L - Nervous layer of retina. F - carry impulse along from rods and cones to ganglionic cells |
| ganglionic cells - L and F | L - nervous layer of retina. F - receive impulse from bipolar cells. Axons form optic nerve. |
| fovea centralis | -area of sharpest vision on the retina. -where your eye tries to focus light |
| optic disc | -where the optic nerve attaches to the eyeball. -blind spot of the eye -does not have all layers of the retina |
| What are the cavities of the interior eyeball? | Anterior and posterior cavities |
| What separates the anterior and posterior cavities of the eyeball | The lens |
| Which cavity (anterior or posterior) is further divided into anterior and posterior chambers? | Anterior |
| What divides the 2 chambers of the anterior eyeball? | the Iris |
| What substance is contained in the anterior cavity of the eyeball? | aqueous humor |
| aqueous humor | -in anterior cavity of eyeball - "watery" - ciliary body produces |
| glaucoma | excess aqueous humor forces cornea forward causing an increase in pressure |
| Another name for the posterior cavity of the eyeball | vitreous chamber |
| vitreous humor | -In posterior cavity of the eyeball -gelatin like -will always have the same amount as when you were born - not produced anymore |
| Composition of the lens | Elastic CT, contains some protein |
| Function of the lens | changes shape to focus an image |
| cataracts | excess protein in the lens... pupil must get larger to compensate. Clouding occurs |
| Action of pupil when you look at something close | moves anterior, becomes thicker |
| Action of pupil when you look at something far | move posterior, becomes thin |
| Visual pathway | light hits rods and cones and is converted to an electrical impulse in the retina and is transmitted to the occipital lobe of the brain |
| cones (b/w or color?) | Color... Cones = Color |
| rods (b/w or color?) | black and white -also, dim light |
Created by:
HugsAndKisses
Popular Anatomy sets