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Senses (The Eye (retina (iris (muscle (smooth (dilates, consctricts),…
Senses
The Eye
Fibrous layer
Sclera "white"
Dense irregular connective tissue
protective
anchor for extrinsic eye muscles
superior oblibue
superior rectus
lateral rectus
medial rectus
inferior oblique
inferior rectus
gives shape
vascular layer
chorid "black"
absorbs light
prevents scattering
nourishes layers near it
especially retina
cornea
transparent
allows light in
helps focus light on retina
ciliary body
continuous with choroid
smooth muscle
changes shape of lens
to focus on distant or near objects
retina
tan color
very thin
location of photoreceptors
rods
most abundant
sensitive to light
cones
sensitive to color
forms optic canal
axons converge to form optic nerve
lens
focus light on retina
iris
anterior to lens
muscle
smooth
dilates
consctricts
sphincter
pupil(hole)
allows light to enter eye
color
optic disc
no photoreceptors
"blind spot"
macula lutea
posterior pole
center is fovea centralis
light focus here
clearest vision
segments
anterior
aqueous"watery" humor
brings nutrients
lens + cornea
avascular
maintain pressure in eye
boundries
cornea to iris
posterior
filled with vitreous humor
viscous "thick" liquid
clear
supports retina + lens
maintains pressure in eye
boundries
iris to lens
Sensory receptors
Exteroceptors
sensitive to stimuli from environment
skin
special senses
sight
smell
sound
taste
Interceptors
sensitive to stimuli from internal organs
proprioceptors
sensitive to stimuli from
muscle
tendons
ligaments
strecthing
balance
body orientation
joints
Types
Thermoreceptors
cold
warm
photoreceptors
light
baroreceptors
pressure
blood pressure
chemoreceptors
chemicals
blood vessels
mechanoreceptors
touch
vibration
strecth
pressure