What does Tonotopic organization mean?

Asked By: Bali Korblein | Last Updated: 8th May, 2020
Category: medical health brain and nervous system disorders
4.1/5 (152 Views . 23 Votes)
Medical Definition of tonotopic
: relating to or being the anatomic organization by which specific sound frequencies are received by specific receptors in the inner ear with nerve impulses traveling along selected pathways to specific sites in the brain.

Click to see full answer


Herein, what does the term Tonotopic organization mean?

Definition. Tonotopic organization expresses gradients in the representation (maps) of sound properties. In a strict sense, tonotopic organization refers only to frequency maps as established by pure tone stimuli.

Also Know, what is Tonotopic organization quizlet? cortex. Tonotopic organization. The systematic mapping of. sound frequency to the place of maximum stimulation. within the auditory system that begins in the cochlea and is preserved through the auditory cortex.

Consequently, what does the Tonotopic organization of auditory pathways entail?

Tonotopic organization is maintained throughout the auditory system. Tonotopic organization means that cells responsive to different frequencies are found in different places at each level of the central auditory system, and that there is a standard (logarithmic) relationship between this position and frequency.

What does it mean for there to be a Tonotopic representation in primary auditory cortex?

The primary auditory cortex is organized in vertical columns with the cells in each column sensitive to the same main sound frequency. Adjacent columns are organized according to the tonotopic representation (from lower frequency to higher frequency moving from posterior to anterior).

32 Related Question Answers Found

How do we know where sound is coming from?

Your brain is able to do this by comparing tiny differences in the way that sounds affect each ear. A sound in front or behind affects each ear the same way, with intermediate effects in-between. The brain uses these differences, even as small as a 100,000th of a second, to calculate where the sound is coming from.

What is the function of the cochlea?

Of those structures, the cochlea, a structure resembling a snail shell in our inner ear, is responsible for the transfer of pressure waves into nerve impulses. A sound wave travels through the ear canal to the tympanic membrane or eardrum, where vibrations are amplified.

How do we hear?

How do we hear? Sound waves travel into the ear canal until they reach the eardrum. The eardrum passes the vibrations through the middle ear bones or ossicles into the inner ear. The inner ear is shaped like a snail and is also called the cochlea.

What are auditory receptors called?

Auditory Receptors
Resting on the basilar membrane of the cochlear duct is the spiral organ of Corti (Fig. The neuroepithelial receptor cells are classified as inner and outer hair cells. The inner hair cells are the receptors for hearing, while the outer hair cells are for modulation.

How are sound waves transduced?


In the auditory system, sound vibrations (mechanical energy) are transduced into electrical energy by hair cells in the inner ear. Sound vibrations from an object cause vibrations in air molecules, which in turn, vibrate the ear drum. These vibrations then pass into the cochlea, the organ of hearing.

Where is the organ of Corti located?

The organ of Corti is located in the scala media of the cochlea of the inner ear between the vestibular duct and the tympanic duct and is composed of mechanosensory cells, known as hair cells.

Where is sound processed in the brain?

The primary auditory cortex lies in the superior temporal gyrus of the temporal lobe and extends into the lateral sulcus and the transverse temporal gyri (also called Heschl's gyri). Final sound processing is then performed by the parietal and frontal lobes of the human cerebral cortex.

What does the organ of Corti consist of?

The organ of Corti is a specialized sensory epithelium that allows for the transduction of sound vibrations into neural signals. The organ of Corti itself is located on the basilar membrane. The organ of Corti rests on the basilar membrane and contains two types of hair cells: inner hair cells and outer hair cells.

Where is the Helicotrema located?

The cochlea and vestibule, viewed from above. The helicotrema (from Greek ?λιξ meaning coil and τρη^μα meaning hole) is the part of the cochlear labyrinth where the scala tympani and the scala vestibuli meet. It is the main component of the cochlear apex. The hair cells near this area best detect low frequency sounds.

How does the auditory system work?


When a sound wave is sent through the external auditory canal, it vibrates the eardrum. The eardrum then sends the vibrations through the ossicles through the “handle” of the malleus. The malleus then strikes the incus, which moves the stapes. The stapes sends the vibrations to the inner ear through the oval window.

Where are Stereocilia located?

In the vestibular system, the stereocilia are located in the otolithic organs and the semicircular canals. Hair cells in the vestibular system are slightly different from those in the auditory system, in that vestibular hair cells have one tallest cilium, termed the kinocilium.

Why is the auditory system important?

In humans, connections of these regions with the middle temporal gyrus are probably important for speech perception. The frontotemporal system underlying auditory perception allows us to distinguish sounds as speech, music, or noise.

What is the structure and function of the parts of the hearing system?

The ear is divided into three main parts – the outer ear, the middle ear, and the inner ear. The inner ear is filled with fluid. The inner ear also contains the receptors for sound which convert fluid motion into electrical signals known as action potentials that are sent to the brain to enable sound perception.

How do cochlear implants work?

Hearing aids amplify sounds so they may be detected by damaged ears. Cochlear implants bypass damaged portions of the ear and directly stimulate the auditory nerve. Signals generated by the implant are sent by way of the auditory nerve to the brain, which recognizes the signals as sound.

Who can get cochlear implants?


Both children and adults can be candidates for cochlear implants. People who are candidates for this device may have been born deaf or become deaf after learning to speak. Children as young as 1 year old are now candidates for this surgery.

Where are low frequency sounds sensed?

High-pitched sounds are detected by cells with shorter hair bundles, located closest to where sound enters the ear; lower-pitched sounds are detected by cells with taller hair bundles located further in, and that pattern progresses through the several thousand hair cells that are essential for hearing.

What are the parts of the auditory system?

The auditory system is a body system that is responsible for the sense of hearing. It is divided into two subsystems- the peripheral auditory system (outer ear, middle ear and inner ear) and the central auditory system (from the cochlear nucleus up to the primary auditory cortex).