1
Question
The correct sequence of regions in the organisation of auditory mechanoreceptor organ is:
The correct sequence of regions in the organisation of auditory mechanoreceptor organ is:
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Solution
The correct option is C Pinna → auditory canal → tympanic membrane → malleus → incus → stapes → cochlea → auditory nerve
Auditory mechanoreceptor organ which is also known as the ear has three parts: - Outer ear
- Middle ear
- Inner ear
The outer ear consists of the cartilaginous pinna that opens into an external auditory canal which leads inwards.
Tympanic membrane or the ear drum is present at the end of the external auditory canal. It separates the outer ear from the middle ear.
In the middle ear, there are three small bones or ossicles -malleus, incus and stapes that are arranged behind the tympanic membrane in a chain-like fashion. Malleus is attached to the tympanic membrane while the stapes is attached to the oval window of the cochlea (structure present in the inner ear).
The inner ear consists of cochlea and the vestibular apparatus.
Cochlea contains a structure called the "organ of Corti" which has several rows of hair cells all along its coiled course which serve as the auditory receptors.
The sound waves travel through the pinna via the auditory canal and reach the ear drum. The vibations produced by the ear drum are then, transferred to the three ear ossicles (malleus, incus and stapes) which are present in the middle ear. They, then, reach the oval window. From the oval window, the vibrations are transferred to the cochlea. In response to the vibrations, the hair cells present in the organ of corti in cochlea bend and press themselves against the tectorial membrane (a thin elastic membrane which is a part of cochlea). This results in the generation of nerve impulses. These impulses are then, transferred to the auditory cortex of the brain through the auditory nerves.
Therefore, the correct sequence of regions (based on their organisation in the ear as well as based on the transmission of sound waves to the brain) is : Pinna → external auditory canal → tympanic membrane (ear drum) → malleus → incus → stapes → cochlea → auditory nerve.
Auditory mechanoreceptor organ which is also known as the ear has three parts:
- Outer ear
- Middle ear
- Inner ear
Tympanic membrane or the ear drum is present at the end of the external auditory canal. It separates the outer ear from the middle ear.
In the middle ear, there are three small bones or ossicles -malleus, incus and stapes that are arranged behind the tympanic membrane in a chain-like fashion. Malleus is attached to the tympanic membrane while the stapes is attached to the oval window of the cochlea (structure present in the inner ear).
The inner ear consists of cochlea and the vestibular apparatus.
Cochlea contains a structure called the "organ of Corti" which has several rows of hair cells all along its coiled course which serve as the auditory receptors.
The sound waves travel through the pinna via the auditory canal and reach the ear drum. The vibations produced by the ear drum are then, transferred to the three ear ossicles (malleus, incus and stapes) which are present in the middle ear. They, then, reach the oval window. From the oval window, the vibrations are transferred to the cochlea. In response to the vibrations, the hair cells present in the organ of corti in cochlea bend and press themselves against the tectorial membrane (a thin elastic membrane which is a part of cochlea). This results in the generation of nerve impulses. These impulses are then, transferred to the auditory cortex of the brain through the auditory nerves.
Therefore, the correct sequence of regions (based on their organisation in the ear as well as based on the transmission of sound waves to the brain) is : Pinna → external auditory canal → tympanic membrane (ear drum) → malleus → incus → stapes → cochlea → auditory nerve.