The human eye and ear
, I
The human eye: Rod
cells Cone cells
Three layers • more effective • more effective
in low light in high light
• outer fibrous layer intensity (dim intensity
(bright light)
• middle vascular layer light)
• Responds
• Responds
• Inner light sensitive layer slowly to light rapidly to light
• Group of cells • Single cell pass
pass impulses impulses to a
to a singular single nerve
nerve fiber fiber
Both: photosensitive
Posterior
Posterior suspensory ·, th
-
·
shamber
(filled with lig aments
aqueous
humour)
Ana T
·
Cornedtranspare
a
·
refracts -T
Sanchange
light,
Shapenation
·
refracts light
size of pupil
Iris
colour
gives
↓
optis
nerve
·
Transmits
signals from
retina to brain
Conjunctiva
.
nerve
impulses
·
Staysmoist Choroid
· > a
>
-
vebral
cortex
Makes tears-lachymal a b
·suppliesblod
·
· Sensitive to dust
gland
·
black to absorb
Cillary Muscle sclera Stray light and improve
image clarity
.Lillary bodyarepares
6
layer-inelastic
.
· butar
connective tissue
to
Change Shape of lens ·
Protection Structure
Retina
+
during accomodation .
·
Inner
pigmented layer
light sensitive
·
Dim vision +
Photoreceptors : Rod cells
·
- >
movement
Cone
~ cells- > Bright light +
nervous tissue color
layer
, I
The human eye: Rod
cells Cone cells
Three layers • more effective • more effective
in low light in high light
• outer fibrous layer intensity (dim intensity
(bright light)
• middle vascular layer light)
• Responds
• Responds
• Inner light sensitive layer slowly to light rapidly to light
• Group of cells • Single cell pass
pass impulses impulses to a
to a singular single nerve
nerve fiber fiber
Both: photosensitive
Posterior
Posterior suspensory ·, th
-
·
shamber
(filled with lig aments
aqueous
humour)
Ana T
·
Cornedtranspare
a
·
refracts -T
Sanchange
light,
Shapenation
·
refracts light
size of pupil
Iris
colour
gives
↓
optis
nerve
·
Transmits
signals from
retina to brain
Conjunctiva
.
nerve
impulses
·
Staysmoist Choroid
· > a
>
-
vebral
cortex
Makes tears-lachymal a b
·suppliesblod
·
· Sensitive to dust
gland
·
black to absorb
Cillary Muscle sclera Stray light and improve
image clarity
.Lillary bodyarepares
6
layer-inelastic
.
· butar
connective tissue
to
Change Shape of lens ·
Protection Structure
Retina
+
during accomodation .
·
Inner
pigmented layer
light sensitive
·
Dim vision +
Photoreceptors : Rod cells
·
- >
movement
Cone
~ cells- > Bright light +
nervous tissue color
layer
