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19 terms

Chapter 12 - Section 12.3 - Sense Organs

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sclera
Tough, white outer layer of the eye
choroid coat
middle layer of the eye; contains blood vessels
retina
The light sensitive layer of the eye which is composed of receptors (rods and cones).
aqueous humor
anterior cavity of the eye filled with clear, watery fluid
vitreous humor
the clear colorless transparent jelly that fills the posterior chamber of the eyeball
nearsightedness
a condition in which nearby objects are seen more clearly than distant objects
farsightedness
condition in which vision for distant objects is better than for near objects
rods
rod-shaped receptor in the retina of the eye that is sensitive to dim light but not color
cones
Receptor cells in the retina that are sensitive to bright light and produce color vision.
pinna
visible part of the outer ear. It collects sound and directs it into the auditory canal
eardrum
the membrane that seperates the outer ear from the middle ear and that vibrates when sound waves strike it (tympanic membrane)
hammer
the bone attached to the eardrum
anvil
the bone between the hammer and the stirrup
stirrup
a tiny U shaped bone that passes vibrations from the anvil to the cochlea
oval window
membrane that covers opening between middle ear and inner ear
cochlea
a coiled tube that is found in the inner ear and that is essential to hearing
semicircular canal
3 loops of fluid filled tubes that that are attached to to the cochlea; maintains equilibrium
olfactory cells
sensitive nerve cells in nasal passages.
eustachian tubes
tube connecting ear to throat; helps to equalize pressure