Chapter 8 Flashcards
General sense organs
detect stimuli; widely distributed throughout the body
Special sense organs
large and complex organs or bylocalized grouping of specialized receptors
sclera
white outer coat of the eyeball
choroid
middle layer of the eyeball that contains a dark pigment to prevent the scattering of lightrays
retina
innermost layer of they eyeball; contains rods and cones and continues posteriorlly with the optic nerve
conjunctiva
mucous membrane that covers the eyelids and sclera in the front
lacrimal gland
makes tears
pupil
black center of the iris; hole in the ciliary muscle
lens
help focus on close and far objects
presbyopia
when lenses lose the ability to focus on close objects because our lenses lose elasticity and can’t bring object into focus
cataract
when a lens loses transparency and becomes milky
rods
receptors for night vision
cones
receptors for day vision
fovea centralis
has the most concentration of cones of any area of the retina
aqueous humor
watery fluid in front of lenses
vitreous humor
jelly like fluid behind the lens
glaucoma
prssure within the eye that could lead to blindness
optic disc
blind spot
auricle
appendage on the side of the head surrounding the opening of the external auditory canal
typanic membrane
the “ear drum” or partition between external or middle ear
ceruminous glands
produce a waxy substance called cerebrum that may collect in thecanal and impar hearing by absorbing or blocking sound waves
ossicle
ear bone
malleus
hammer shaped bones
incus
anvil shaped bones
stapes
stirrup shaped bones
eutachian tube
connects throat with middle ear
perilymph
watery fluid in the bony labrinth
vetibule
adjacent to oval windows between
cristaabpullaris
generates nerve impulses when you move your head
organ or corti
the organ of hearing
