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Eyes and Ears- Anatomy
Anatomy of the eyes and ears
Terms in this set (48)
Primary function is to capture light and transform it into images that the brain interprets.
Thin folds of skin that cover and protect the eye. provide protection and help lubricate the eyes
transparent part of the outer layer of the eye. the iris and pupil are visible through it.
covers the front of the eye and refracts light rays inward
thick watery substance that is continuously replenished. maintains the curvature of the lens. located between the lens and cornea
Converges light rays to a focal point on the back wall of the eye ( the Retina) by acting like a biconvex lens.
Small muscles in the eye that control the lens. located around the iris and lens
Holds the lens in place and regulates its thickness.
The colored part of the eye. contains smooth muscles and controls the size of the pupil. located in the front of the lens
Regulates the amount of light that enters the eye by controlling the size of the pupil.
Is an opening that allows light to enter the eye.
Is a gelatinous substance that gives shape to the eye. located between the lens and the retina.
Receives the images we see.
Is a thin, blood-rich, transparent membrane covering the white portion of the eye and lining the eyelid. protects the eye from infection.
Is the middle layer of the eye. A thin layer of blood vessels in the eye.
Is the white part of the eye. Protects the eye and is the outer layer of the eye.
When the sphincter muscles contract, the pupil shrinks.
Responsible for the transmission of sight impulses to the brain. located at the back of the eye and connects to the brain.
Transmits signals from the eye to the brain.
Responsible for the transmission of feeling from the eye and surounding areas. located around the eye and connects to the brain.
Trasnmits sensory information, including pain and temperature, from the eye and surrounding areas to the brain
Are tear glands that are slightly antimicrobial. located in the upper portion of the eye.
Secrete fluids (tears) that protect and lubricate the eye.
Converts sound waves into electrical nerve impulses and help with balance and equilibrium.
Acts as a funnel, collecting and channeling sound waves. consists of four parts, auricle, external auditory canal, ceruminous glands, and the tympanic membrane (ear drum).
Capture and funnel sound waves toward the ears interior.
External Auditory Canal (ear canal)
A tube that leads from the auricle to the tympanic membrane. the outer third of the canal contain many short hairs and ceruminous glands.
Specialized glands that produce cerumen (ear wax). located in the outer third portion of the external auditory canal.
Tympanic Membrane (ear drum)
Sound waves converted to mechanical vibrations and separates the external and middle ear.
Contains the Auditory Ossicles and the Eustachian Tube
Consist of three small bones- the malleus, incus, and stapes. each bone is the size of a match head.
Conduct mechanical vibrations from the tympanic membrane to the inner ear.
A tube that connects the middle ear to the upper part of the pharynx. Equalizes the air pressure on both sides of the tympanic membrane.
Consists of three areas- the vestibule, semicirular canals, and the cochlea.
A small chamber that collects sound vibrations that enter the internal ear. located in the central section of the inner ear.
Are three half-circular canals arranged at right angels to each other. Each canal contains a fluid called endolymph.
Located in the upper section of the inner ear. Controls balance, sense, body position, and equilibrium.
Picks up vibrations from the stapes and transforms the sounds waves into signals for transmission.
Organ of Corti
Site within the cochlea that contains mechanically sensitive hair cells. located within the cochlea. converts sound waves into nerve impulses via the hair cells.
When the radial (dilator) muscles contract and the pupil dilates.
Perceive colors, bright light, and color vision.
Responsible for non-color vision under dim light conditions and sense motion.
A cup-like depression or pit in the retina, is the greatest point of visual acuity because it contains more cones than rods.
Are sent to the optic nerve where they are transmitted to the brain and interpreted as images.
To clean and lubricate the eye.
Attached to the tympanic membrane, vibrates in unison with the membrane and strikes the incus.
Attaches perpendicularly to the malleus, acts as a lever and displaces the stapes.
Vibrates the oval window in the cochlea
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