Senses
Kaitlyn Iliff Anatomy 2041 Section 33
sensory receptors monitor external & internal environment, described by location within body or location of stimuli they respond
exteroceptors sensitive to stimuli outside body & located at or near body surface.
touch receptors
pressure receptors
pain receptors
temperature receptors
MOST of the special sense organs
interoceptors visceroceptors, receive stimuli from the internal viscera.
monitor
feel
viscera pain
nausea
hunger
faintness
changes in chemical concentration
temperature
stretching tissue
taste stimuli
receive stimuli from
lungs
digestive tube
bladder
proprioceptors monitor degree of stretch of these locomotory organs & send input on body movements to the CNS.
located in musculoskeletal organs
tendons
joints
skeletal muscles
ligaments
Stimulus type
mechanoreceptors
respond to mechanical forces
touch
pressure
stretch
vibrations
baroreceptor
monitors blood pressure
thermoreceptors
respond to temperature changes
chemoreceptors
respond to chemicals in solution and to changes in blood chemistry
photoreceptors
in the eye respond to light
nocireceptors
respond to harmful stimuli that result in pain
THE EYE
cones color vision
rods allow light
optic disc axons converge to form optic nerve
blind spot
posterior pole only cones, place of sharpest vision, center of macula lutea.
posterior segment
anterior segment
filled with vitreous humor, viscous liquid, transmits light, supports retina and lens, maintains normal pressure and shape of eye.
filled with aqueous humor, transmit light, nourishes two parts the lens and the cornea, maintains pressure/shape.
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Information is from the book for our Anatomy class online and class notes
optic disc raised disc on the retina
retina contains cells that trigger nerve impulses
vitreous humor gelatinous tissue filling eye posterior to lens
choroid pigmented vascular area of eye
aqueous humor clear fluid between lens and retina
sclera white part of eye surrounding cornea
cornea covers the iris, pupil & anterior chamber
lens posterior to iris, focus light on retina
iris posterior to the cornea, dilate or constrict to allow more/less light into the eye.
pupil opening