Special Senses- The Eye Flashcards Preview

Honors Anatomy & Physiology > Special Senses- The Eye > Flashcards

Flashcards in Special Senses- The Eye Deck (9):
1

vision
# sensory receptors in eyes?
what do eyes detect?
wavelengths they detect?
which colors have which wavelengths?
how is color seen?
white vs black light?

more then 1/2 of all sensory receptors located in eyes
- eyes detect visible light
- 400 to 700 nm wavelengths
- exhibits colors
- 400 nm violet
- 700 nm red
-color seen is wavelength reflected
- white light: all wavelengths reflected
- black: all wavelengths absorbed

2

accessory structures of the eye (4)

eyelids
eyebrows & eyelashes
lacrimal apparatus
extrinsic eye muscles

3

eyelids
which muscles move? function of eyelids?

orbicularis oculi- closes lid
levator palpebrae superioris- opens lid (lifts up)
FUNCTION: shade, protect, lubricate eye

4

2 different parts of eyelid?

tarsal glands or Meibomian glands
Conjunctiva

5

tarsal glands or Meibomian glands
description? function?

modified sebaceous glands
keep eyelids from adhering to each other
(under upper eyelid) (every time blink, secrete seb. oils)

6

Conjunctiva
description? function?

(THIN, contains tiny blood vessels)
lines eyelids & attached to "white" of the eye
-conjuctivitis: "pink eye" (inflammation)
protective mucus membrane

7

Eyebrows & eyelashes
description? function? contains? their function?

protects from foreign substances, perspiration, direct sunlight
-contains Sebaceous Glands 2 eyelash follicles
-lubricaiton
- Sty: inflammation of sebaceous gland (can affect eyesight if not treated, pimple on eye)

8

Lacrimal apparatus
description? function?

structures that produce & drain tears
-function: Protect, Clean, Lubricate the eyeball

9

Extrinsic Eye Muscles
description? # of muscles that control movements? which?

Extend from bony orbit to sclera (white) of eye
-surrounded by fat tissue
-6 muscles control eyeball movements
-controlled by cranial nerves 3, 4, 6