1. The Senses

2. cow eye dissection video
Eye Anatomy
Cornea
Outer protective layer
Iris
Colored part of the eye
Contains muscles to open & close the pupil
Pupil
Size adjusts with light
Shrinks in bright light
Opens in dim light
Lens
Focuses light onto the retina
Vitreous Gel
Fluid filled sac provides nutrients to eye
Retina
Back of the eye
Contains rods & cones
Optic Nerve
Sends impulses to brain
Optic nerve
cornea
vitreous
lens
pupil
iris
retina
cow eye dissection video

3. Vision Process 1) Light passes through pupil#3 #2 #1
1) Light passes through pupil
2) Lens focuses light onto retina
3) Photoreceptors of the retina create impulses
4) Impulse travels up optic nerve to brain

5. Read the color of the text Read the color of the text

6. Ear Anatomy Pinna Outer ear Eardrum
Amplifies sound by 3 bones: malleus, incus, stapes
Cochlea
Contains mechanoreceptors (measures pressure)

7. Sound Transmission
1) Sound waves (vibration of the air) enters the ear canal
2) Eardrum & the small bones vibrate
3) Fluid in the cochlea vibrates
4) Hair cells in the cochlea bend
5) Impulse transmitted through the auditory nerve and to the brain

9. Cochlear Implants
Up to 22 electrodes sending signals to auditory nerve system.

10. Smell & Taste Nose Scent chemicals dissolve in mucus
Impulse travels from olfactory nerve to brain
Tongue
Chemicals dissolve in saliva
Chemoreceptors in taste buds creates impulse
Sweet, sour, bitter, salty & umami.

11. Touch, Temperature, Pain
Mechanoreceptors in skin sense pressure
Upper layer: gentle touches
Lower layer: heavy pressure
Thermoreceptors & Pain receptors detect temps and chemicals released by damaged cells
Impulses sent to brain