Ch. 7.7 Special Senses Key Terms
a clear, watery fluid that fills the space between the cornea and iris. It helps maintain the forward curvature of the eyeball and refracts light rays.
aqueous humor
A mucous membrane, called the ----, lines the eyelids and covers the front of the eye to provide additional protection and lubrication.
conjunctiva
a circular structure located behind the pupil and suspended in position by ligaments.
lens
bends
refracts
The first section is the ---, which acts as the entrance to the two other parts of the inner ear.
vestibule
he pinna is elastic cartilage covered by skin. It leads to a canal, or tube, called the external auditory meatus, or
auditory canal
a circular, transparent part of the front of the sclera. It allows light rays to enter the eye.
cornea
transmits the impulses from sound waves to the auditory nerve.
organ of corti
The innermost layer of the eye is the
retina
the jellylike substance that fills the area behind the lens.
vitreous humor
The outer ear contains the visible part of the ear, sen called the pinna, or
auricle
The middle ear is connected to the pharynx, or throat, by a tube called the
eustachian tube
It contains three small bones (ossicles): the malleus, the incus, and the stape
ossicles
The outermost layer is the tough connective tissue called the
sclera
the middle layer of the eye
choroid coat
the colored portion of the eye. It is located behind the cornea on the front of the choroid coat.
iris
The outer ear contains the visible part of the ear, sen called the
pinna
located in the inner ear. These canals contain a liquid and delicate, hairlike cells that bend when the liquid moves with head and body movements.
semicircular canals
shaped like a snail's shell, contains delicate, hairlike mechanoreceptor cells, which compose the organ of Corti, a receptor of sound waves.
cochlea
the eye produce tears, which constantly moisten and cleanse the eye.
lacrimal glands
The opening in the center of the iris is called the
pupil
separates the outer ear from the middle ear. It vibrates when sound waves hit it and transmits the sound waves to the middle ear.
The middle ear is a small space, or cavity, in the temporal bone
tympanic membrane