• Cornea
Eye Anatomy
– Outer protective layer
• Iris
– Colored part of the eye
– Contains muscles to open
& close the pupil
Optic
nerve
• Pupil
cornea
vitreous
– Size adjusts with light
• Shrinks in bright light
• Opens in dim light
• Lens
lens
pupil
iris
– Focuses light onto the
retina
• Vitreous Gel
– Fluid filled sac provides
nutrients to eye
• Retina
– Back of the eye
– Contains rods & cones
retina
cow eye
dissection
video
• Optic Nerve
– Sends impulses to brain
Vision Process
#3
#1
• 1) Light passes through cornea & pupil
• 2) Lens focuses light onto retina
• 3) Photoreceptors of the retina create impulses
– Impulse travels up optic nerve to brain
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Read the color of the text
Read the color of the text
Ear Anatomy
• Pinna
– Outer ear
• Eardrum
– Amplifies sound by 3 bones: malleus, incus, stapes
• Cochlea
– Contains mechanoreceptors (measures pressure)
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) Cilia of “hair cells” in the cochlea bend (impulse generated)
5) Impulse transmitted through the auditory nerve and to the brain
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
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
1) Name the 5 senses.
2) Label the diagram of the eye.
3) Which eye part:
 Protects the outer eye?
 Contains rod & cone cells?
 Focuses light?
4) Name the three bones behind
the ear drum?
5) Name the bone of the ear that
has hair cells.
6) Which sense is:
 related to the optic nerve?
 related to the olfactory
nerve?
 related to the auditory
nerve?
7) Which nerves detect:
 temperature changes?
 Pressure?
 Chemicals?
Kobe Kuiz