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Flashcards in Chapter 8 Deck (30):
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Special sense organs

large and complex organs or bylocalized grouping of specialized receptors

1

General sense organs

detect stimuli; widely distributed throughout the body

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sclera

white outer coat of the eyeball

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choroid

middle layer of the eyeball that contains a dark pigment to prevent the scattering of lightrays

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retina

innermost layer of they eyeball; contains rods and cones and continues posteriorlly with the optic nerve

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conjunctiva

mucous membrane that covers the eyelids and sclera in the front

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lacrimal gland

makes tears

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pupil

black center of the iris; hole in the ciliary muscle

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lens

help focus on close and far objects

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presbyopia

when lenses lose the ability to focus on close objects because our lenses lose elasticity and can't bring object into focus

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cataract

when a lens loses transparency and becomes milky

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rods

receptors for night vision

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cones

receptors for day vision

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fovea centralis

has the most concentration of cones of any area of the retina

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aqueous humor

watery fluid in front of lenses

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vitreous humor

jelly like fluid behind the lens

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glaucoma

prssure within the eye that could lead to blindness

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optic disc

blind spot

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auricle

appendage on the side of the head surrounding the opening of the external auditory canal

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typanic membrane

the "ear drum" or partition between external or middle ear

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ceruminous glands

produce a waxy substance called cerebrum that may collect in thecanal and impar hearing by absorbing or blocking sound waves

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ossicle

ear bone

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malleus

hammer shaped bones

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incus

anvil shaped bones

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stapes

stirrup shaped bones

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eutachian tube

connects throat with middle ear

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perilymph

watery fluid in the bony labrinth

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vetibule

adjacent to oval windows between

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cristaabpullaris

generates nerve impulses when you move your head

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organ or corti

the organ of hearing