1. The Senses

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

3. 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

4. Sound Transition Animation

5. Click here if it doesn’t play

6. Eye Anatomy Sense: Vision
Cornea
Protective layer of the eye
Iris
Colored part of the eye
Contains muscles to open & close the pupil
Pupil
Size adjusts with light
Small: more light
Large: less light
Lens
Focuses light onto the retina
Retina
Back of the eye
Contains photoreceptors
Rods: detect absence of light (black & white)
Cones: detect color
Optic Nerve
Sends impulses to brain
Eye Anatomy Sense: Vision

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

8. The shape of the cornea can change where the light gets focused… that’s what causes near or far sightedness

9. Read the color of the text Read the color of the text

10. Cow Eye Dissection
Or click here if it doesn’t play

11. Sense: Smell & Taste Nose Tongue Scent chemicals dissolve in mucus
Impulse travels from olfactory nerve to brain
Tongue
Chemicals dissolve in saliva
Chemoreceptors in taste buds creates impulse

12. Sense: Touch (Temperature, Pain, Pressure)
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

13. REview Name the 5 senses. Label the diagram of the eye.
Which eye part:
Protects the outer eye?
Contains rod and cone cells?
Focuses light?
Name the three bones behind the ear drum?
Name the bone of the ear that has hair cells.
Which sense is:
related to the optic nerve?
related to the olfactory nerve?
related to the auditory nerve?
Which receptors detect temperature changes?
REview