Chapter 7 Flashcards
pitch
a perceptual dimension of sound; corresponds to the fundamental frequency
hertz
cycles per second
loudness
a perceptual dimension of sound; corresponds to intensity
timbre
a perceptual dimension of sound; corresponds to complexity
tympanic membrane
the eardrum
ossicle
one of the three bones of the middle ear
malleus
the hammer; the first of the three ossicles
incus
the anvil; second of the three ossicles
stapes
the stirrup; the last of the three ossicles
cochlea
the snail shaped structure of the inner ear that contains the auditory transducing mechanisms
oval window
an opening in the bone surrounding the cochlea that reveals a membrane, against which the baseplate of the stapes presses, transmitting sound vibrations into the fluid within the cochlea
organ of corti
the sensory organ on the basilar membrane that contains the auditory hair cells
hair cell
the receptive cell of the auditory apparatus
deiters’s cell
a supporting cell found in the organ of corti; sustains the auditory hair cells
basilar membrane
a membrane in the cochlea of the inner ear; contains the organ of corti
tectorial membrane
a membrane located above the basilar membrane; serves as a shelf against which the cilia of the auditory hair cells move
round window
an opening in the bone surrounding the cochlea of the inner ear that permits vibrations to be transmitted via the oval window into the fluid in the cochlea
cilia
the hairlike appendages of a cell involved in movement or in the transducing sensory information; found on the receptors in the auditory and vestibular system
tip link
an elastic filament that attaches the tip of one cilium to the side of the adjacent cilium
insertional plaque
the point of attachment of a tip link to a cilium
cochlear nerve
the branch of the auditory nerve that transmits auditory information from the cochlea to the brain
olivocochlear bundle
a bundle of efferent axons that travel from the olivary complex of the medulla to the auditory hair cells on the cochlea
cochlear nucleus
one of a group of nuclei in the medulla that receives auditory information from the cochlea
superior olivary complex
a group of nuclei in the medulla; involved with auditory functions, including localization of the source of sounds
lateral lemniscus
a band of fibers running rostrally through the medulla and pons; carries fibers of the auditory system
tonotopic representation
a topographically organized mapping of different frequencies of sound that are represented in a particular region of the brain
core region
the primary auditory cortex, located on a gyrus on the dorsal surface of the temporal lobe
belt region
the first level of auditory association cortex; surrounds the belt region
parabelt region
the second level of auditory association cortex; surrounds the belt region
place code
the system by which information about different frequencies is coded by different locations on the basilar membrane
rate code
the system by which information about different frequencies is coded by the rate of firing of neurons in the auditory system
cochlear implant
an electronic device surgically implanted in the inner ear that can stimulate the basilar membrane
fundamental frequency
the lowest, and usually most intense frequency of a complex sound; most often perceived as the sounds’ basic pitch
overtone
the frequency of complex tones that occurs at multiples of the fundamental frequency
phase differences
the difference in arrival times of sound waves at each of the eardrums
intensity difference
the difference in sound intensities at each of the eardrums
vestibular sac
one of a set of two receptor organs in each inner ear that detect changes in the tilt of the head
semicircular cancel
one of the three ringlike structures of the vestibular apparatus that detect changes in head rotation
utricle
one of the vestibular sacs
saccule
one of the vestibular sacs
ampulla
an enlargement in a semicircular canal; contains the cupula and the crista
cupula
a gelatinous mass found in the ampulla of the semicircular canals; moves in response to the flow of the fluid in the canals
vestibular ganglion
a nodule on the vestibular nerve that contains the cell bodies of the bipolar neurons that convey vestibular information to the brain
cutaneous sense
one of the somatosense; includes sensitivity to stimuli that involve the skin
proprioception
perception of the body’s position and posture
kinesthesia
perception of the body’s own movements
organic sense
a sense modality that arises from receptors located within the inner organs of the body
glabrous skin
skin that does not contain har; found on the palms and soles of the feet
merkel’s disk
a touch sensitive cutaneous receptor important for detection of form and roughness, especially by finger tips
ruffini corpuscle
a touch sensitive cutaneous receptor important in detecting stretching or static force against the skin, most important in proprioception
meissner’s corpuscle
a touch sensitive cutaneous receptor important in detecting edge contours or braille like stimuli especially by fingertips
pacinian corpuscle
a vibration sensitive cutaneous receptor important in detecting vibration from an object being held
mechanoreceptor
a senory neuron that responds to mechanical stimuli: for example those that produce pressure, stretch, or vibration of the skin or stretch of muscles or tendons
phantom limb
sensations that appear to originate in a limb that has been amputated
umami
the taste sensation produced by glutamate
chorda tympani
a branch of the facial nerve that passes beneath the ear drum; conveys taste information from the anterior part of the tongue and controls the secretion of some salivary glands
nucleus of the solitary tract
a nucleus of the medulla that receives information from visceral organs and from the gustatory system
olfactory epithelium
the epithelial tissue of the nasal sinus that covers the cribriform plate; contains the cilia of the olfactory receptors
olfactory bulb
the protrusion at the end of the olfactory tract; receives input form the olfactory receptors
mitral cell
a neuron located in the olfactory bulb that receives information from olfactory receptors; axons of mitral cells bring information to the rest of the brain
olfactory glomerulus
a bundle of dendrites of mitral cells and the associated terminal buttons of the axons of olfactory receptors