Physiology Ch. 12 (The Ear)

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Introduction to the Human Body Ch. 12- The Ear

outer ear

part of ear which collects sound waves and directs them to the external auditory canal and includes the pinna/auricle, external auditory canal, and eardrum/tympanic membrane

auricle

a skin-covered flap of elastic cartilage that plays a small part in collecting sound waves and directing them towards the external auditory canal

external auditory canal

a curved tube in the temporal bone connecting the outer and middle ears

ceruminous glands

modified sweat glands, located in external ear canal, secretes cerumen (earwax)

cerumen

Earwax, substance secreted by the ceruminous glands in the external auditor canal of the external ear

tympanic membrane

(eardrum) A structure that separates the outer ear from the middle ear and vibrates in response to sound waves.

middle ear

the chamber between the eardrum and cochlea containing three tiny bones (hammer [malleus], anvil [incus], and stirrup [stapes]) that concentrate the vibrations of the eardrum on the cochlea's oval window

Eustachian tube

(auditory tube) connects the middle ear with the upper part of the throat.

auditory ossicles

3 smallest bones in the body, Malleus, Incus, Stapes. transmit the sound vibrations from the eardrum to the oval window and the round window which connect to the middle and inner ear

oval window

membrane across the opening between the middle ear and inner ear that conducts vibrations to the cochlea

inner ear

part of the ear that contains the liquid filled cochlea; here sound vibrations are converted into electric impulses that travel through a nerve to the brain. Divided into the (outer) bony labyrinth and (inner) membraneous labyrinth.

bony labyrinth

series of cavities in the temporal bone, (cochlea, vestibule, and semicircular canals) and contains perilymph.

membraneous labyrinth

a series of sacs and tubes with the same general shape as the bony labyrinth. contains endolymph.

vestibule

oval-shaped middle part of the bony labyrinth. The membraneous labyrinth in the vestibule consists of the utricle and saccule.

utricle

larger of two sacs within the membranous labyrinth of the vestibule in the inner ear that contains the receptor organ for static equilibrium

saccule

smaller of two sacs within the membranous labyrinth of the vestibule in the inner ear containing a receptor organ of static equilibrium

semicircular canals

three bony channels (anterior, posterior, lateral), filled w/ perilymph, in which lie in the membraneous semicircular canals filled with endolymph. They contain receptors for equilibrium.

ampulla

the dilated portion of a canal or duct especially of the semicircular canals of the ear

semicircular ducts

the membraneous semicircular canals filled w/ endolymph and floating in the perilymph of the bony semicircular canals; they contain cristae that are concerned with dynamic equilibrium.

cochlea

the sense organ for hearing. A bony spiral canal that is divided into the scala vestibuli (begins at oval window), the scala tympani (ends at round window), and the cochlear duct.

round window

a small opening between the middle and internal ear, directly inferior to the oval window, covered by the secondary tympanic membrane

organ of Corti

(spiral organ), organ of hearing that consists of hair cells and supporting cells that rest on the basilar membrane and extend into the endolymph of the cochlear duct.

equilibrium

a state of balance

static equilibrium

the maintenance of the posture in response to changes in the orientation of the body, mainly the head, relative to the ground, (A form of equilibrium where there are no processes occurring anywhere in the system.)

dynamic equilibrium

the maintenance of body position, mainly the head, in response to sudden movement, such as rotation. (A condition that is stable within certain levels)

vestibular apparatus

collective term for the organs of equilibrium, which includes the saccule, utricle, and semicircular ducts.

maculae

small, thickened regions in the walls of the saccule and the utricle.

hair cells

Sensory receptors found in the inner ear. Cochlear hair cells respond to vibration in the cochlea caused by sound waves and vestibular hair cells respond to changes in position and acceleration (used for balance).

supporting cells

cells that support hair cells

otolithic membrane

thick, gelatinous, glycoprotein layer located directly over hair cells of the macula in the saccule and uricle of the internal ear

otolith

calcium carbonate particles embedded in the otolithic membrane that functions in maintaining static equilibrium

vestibular branch

conducts nerve impulses to the vestibulocochlear branch

crista

a crest or ridged structure. a small elevation inthe ampulla of each semicircular duct that contains receptors for dynamic equilibrium

cupula

a mass of gelatinous material covering the hair cells of a crista; a sensory receptor in the ampulla of a semicircular canal stimulated when the head moves

Deafness

partial or complete loss of hearing. Sensorineural deafness: caused by the impairment if hair cells in the cochlea or damage of the cochlear branch of the vestibulocochlear nerve. Conduction deafness: caused by impairment of the outer and middle ear mechanisms for transmitting sounds to the cochlea.

Meniere's disease

Collection of fluid in the labyrinth of the inner ear and a degeneration of the hair cells in the cochlea and vestibule

Otitis Media

an acute, ear infection caused by bacteria from the throat

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