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Senses (Chapter 15)

Surrounds the entrance to the external canal; protects the canal; channels sound waves into the canal. Pinna
Channels sound waves to the tympanum. External Auditory Canal
Thin membrane that separates the external ear from the middle ear; vibrates in response to sound waves. Tympanum
Auditory ossicle attached to the tympanum; AKA the hammer. Malleus
The auditory ossicle attached to the oval window; AKA the stirrup. Stapes
The middle auditory ossicle; AKA the anvil. Incus
The bones in the middle ear; transmit sound waves from the tympanum to the oval window. Auditory ossicles
Thin membrane that causes the fluid in the cochlea to vibrate in response to sound waves carried by the ossicles. Round window
Thin membrane that separates the fluid in the cochlea form the air in the middle ear. Oval window
Contains receptors that provide sensation of hearing. Cochlea
Helps maintain balance when the head and body are moved suddenly. Dynamic
Maintains posture and stability when the body is motionless. Static
Provides information about position with respect to gravity. Static
Provides information about rotational movements of the head. Dynamic
Receptors are found in the semicircular canals. Dynamic
Receptors are found in the vestibule Static
Inherited bone disorder that impairs conduction by causing structural irregularity in the stapes. Otosclerosis
"ringing in the ear" Tinnitus
Middle ear infection Otitis media
Sensation of spinning Vertigo
Progressive hearing loss associated with aging Presbycusis
Chronic inner ear disease characterized by progressive nerve deafness and vertigo Meniere's disease
Nearsightedness Myopia
An irregularity in the cornea Astigmatism
"pink-eye" Conjunctivitis
Chlamydial conjunctivitis Trachoma
Cloudy spots in the eye's lens Cataracts
Often caused by diabetes mellitus Retinopathy
Farsightedness Hyperopia
"night-blindness" Nyctalopia
Loss of only the center of the visual field. Scotoma
Excessive intraocular pressure caused by abnormal accumulation of aqueous humor. Glaucoma
Rich in blood and contains a dark pigment that prevents light scattering within the eye. Choroid
Pigmented portion of the eye that control the diameter of the pupil. Iris
Allows light to enter the eye. Pupil
Attached to the lens; changes the shape of the lens during focusing. Ciliary body
Contains the photoreceptors (rods and cones); converts light into a nerve impulse. Retina
Blind spot; where the optic nerve exits the eyeball. Optic disc
Yellow spot; area of high cone density. Macula lutea
Contains only cones and is the area of greatest visual acuity. Fovea centralis
Focuses light into the retina. Lens
Holds the lens upright and is attached to the ciliary body. Suspensory ligament
Contains aqueous humor. Anterior chamber
Contains vitreous humor. Vitreous chamber
White of the eye. Sclera
Anterior portion of the fibrous tunic; clear and transparent. Cornea
Muscles that constrict the pupil when contracted. Circular muscles
Muscle that dilate the pupil when contracted. Radial fibers
Produces tears. Lacrimal apparatus
Mucous membrane that lines the internal surface of the eyelids and continues over the anterior surface of the eyeball to the other edge of the cornea. Conjunctiva
Inflammation of the conjunctiva. Conjunctivitis
Modified swear glands that lie between the eyelashes and help lubricate the eyeball. Ciliary glands
Inflammation of the ciliary glands. Sty
Secrete an oily substance. Meibomian glands
Dilute salt solution that cleanses, moistens, and protects the eye surface. Tears
Light bending. Refraction
Ability to focus for close (under 20 ft.) vision. Accomodation
Normal vision. Emmetropia
Inability to focus well on close objects (farsightedness). Hyperopia
Nearsightedness. Myopia
Blurred vision due to unequal curvatures of the lens or cornea. Astigmatism
Medial movement of the eyes during focusing on close objects. Convergence
The ear is divided into _____ major sections. Three (3)
The function of the ossicles is to ________ sound vibrations through the middle ear. Amplify & Carry
Another name for the eardrum is the _______. Tympanic membrane
The ______ in the inner ear houses the structure that converts sound vibrations into nerve impulses. Cochlea
The collective name for the three tiny bones found in the middle ear is _________. Ossicles
The name of the first of the three tiny bones found in the middle ear is _______. Malleus (Hammer)
The name of the second of the three tiny bones found in the middle ear is _______. Incus (Anvil)
The name of the third of the three tiny bones found in the middle ear is _______. Stapes (stirrup)
__________ are located in the inner ear deal with balance & equilibrium. Semicircular canals
A tube connecting th eback of the throat with the middle ear is the __________. Eustachian
_______ is a term used to denote "ringing" in the ears. Tinnitus
A structure called the __________ carries nerve impulses from the inner ear to the brain. Auditory nerve
The flap of the outer ear is called the _____. Auricle
The main task of the Eustachian tube is to ________ the air pressure in the middle ear to the air pressure of the outer ear. Equalize
The auricle's function is to direct __________ into the canal of the outer ear. Sound vibrations
Created by: kserrano005