Maximus Gage
The ear does have muscles, and these can be found in the middle ear. The two muscles in the middle ear are the tensor tympani and the stapedius, and they function to protect the ear from loud noises. All muscles produce low-frequency sound during contraction, and the sound produced by the muscles in proximity to the ear is called 'physiological noise'.
| Characteristics | Values |
|---|---|
| Number of muscles in the middle ear | Two |
| Names of muscles in the middle ear | Tensor Tympani and Stapedius |
| Function of the Tensor Tympani muscle | Protects the middle ear from loud noises |
| Origin of the Tensor Tympani muscle | The auditory tube (eustachian tube) |
| Insertion point of the Tensor Tympani muscle | The manubrium of the ear drum |
| Innervation of the Tensor Tympani muscle | The mandibular division of the trigeminal nerve (V), through the trigeminal ganglion |
| Implication of muscle contraction near the ear | Production of low-frequency sound |
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What You'll Learn
- The Tensor Tympani muscle and the Stapedius muscle protect the middle ear from loud noises
- The Tensor Tympani originates from the auditory tube and inserts onto the manubrium of the ear drum
- The Stapedius is innervated by the mandibular division of the trigeminal nerve
- The medial olivocochlear system connects to the outer hair cells
- The middle ear muscles produce low-frequency sound during contraction
The Tensor Tympani muscle and the Stapedius muscle protect the middle ear from loud noises
The ear does have muscles. There are two muscles within the middle ear that function to protect it from loud noises: the Tensor Tympani and the Stapedius. The Tensor Tympani muscle originates from the auditory tube (also known as the Eustachian tube) and inserts onto the manubrium of the ear drum. It is innervated by the mandibular division of the trigeminal nerve (V), through the trigeminal ganglion. In people with hyperacusis, there is an increased reactivity of the TT reflex as part of the startle response to loud sound. The lowered reflex threshold for TT contraction can be activated by the anticipation of loud sound. The Stapedius muscle is the other middle ear muscle that protects the ear from loud noises. The medial olivocochlear system connects to the outer hair cells and suppresses otoacoustic emissions. The role of this system has been extensively studied, but the role of the complementary network has not.
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The Tensor Tympani originates from the auditory tube and inserts onto the manubrium of the ear drum
The ear does have muscles. There are two muscles within the middle ear: the tensor tympani and the stapedius. The tensor tympani originates from the auditory tube (also known as the eustachian tube) and inserts onto the manubrium of the ear drum. The function of the tensor tympani and the stapedius is to protect the middle ear from loud noises.
The tensor tympani is a large brown muscle. It is innervated by the mandibular division of the trigeminal nerve (V), through the trigeminal ganglion. The trigeminal nerve is the largest of the 12 cranial nerves and is responsible for sensation in the face and motor functions such as biting and chewing. The tensor tympani is also associated with hyperacusis, a condition characterised by an increased sensitivity to sound. In people with hyperacusis, there is an increased reactivity of the TT reflex as part of the startle response to loud sounds. The lowered reflex threshold for TT contraction can be activated by the anticipation of loud sound.
The tensor tympani and the stapedius are middle ear muscles. They are part of the efferent pathways that regulate the sensitivity of the auditory system. The medial olivocochlear system is the other major efferent pathway that regulates auditory sensitivity. It connects to the outer hair cells. The medial olivocochlear system has been extensively studied for its role in suppressing otoacoustic emissions. However, the role of the middle ear muscles in this process has not been as widely studied.
All muscles produce low-frequency sound during contraction. This can be a source of "physiological noise" during auditory selective attention experiments. The potential role of muscle sound in these experiments has not been adequately considered. Further experiments are needed to better understand the implications of muscle sound for selective attention.
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The Stapedius is innervated by the mandibular division of the trigeminal nerve
The ear has two muscles within the middle ear: the Tensor Tympani and the Stapedius. These muscles function to protect the ear from loud noises. The Stapedius is innervated by the mandibular division of the trigeminal nerve.
The trigeminal nerve is the fifth cranial nerve and has three branches: the ophthalmic, maxillary, and mandibular. The mandibular nerve is the third branch and is the largest of the three divisions. It carries both afferent and efferent fibres. The mandibular nerve originates from the trigeminal ganglion of Gasser and exits the skull through the foramen ovale. Once it reaches the viscerocranium, it divides into two divisions: anterior and posterior. Both divisions further divide into smaller branches that innervate the structures of the face. The mandibular nerve provides general sensory innervation to the buccal membranes of the mouth (i.e. the cheek). It also branches to supply the second and third molar teeth.
The Tensor Tympani muscle originates from the auditory tube (eustachian tube) and inserts onto the manubrium of the ear drum. It is innervated by the mandibular division of the trigeminal nerve (V), through the trigeminal ganglion. The trigeminal ganglion is a group of nerve cells located in the head that transmit sensory information to the brain.
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The medial olivocochlear system connects to the outer hair cells
The ear has two muscles within the middle ear: the tensor tympani and the stapedius. These muscles function to protect the ear from loud noises. The tensor tympani muscle originates from the auditory tube (also known as the eustachian tube) and inserts onto the manubrium of the ear drum. The medial olivocochlear system connects to the outer hair cells and is one of the two major efferent pathways that regulate the sensitivity of the auditory system. The other pathway is the middle ear muscles, which include the tensor tympani and stapedius. The medial olivocochlear system plays a role in suppressing otoacoustic emissions, although the complementary network of middle ear muscles has not been as extensively studied. Studies of selective attention have found that decreases in otoacoustic emissions from contralateral stimulation can be attributed to the medial olivocochlear system. However, it is important to note that the results of these studies can be influenced by parallel muscle activity.
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The middle ear muscles produce low-frequency sound during contraction
The ear does have muscles, and there are two muscles within the middle ear: the tensor tympani and the stapedius. These muscles function to protect the ear from loud noises. The tensor tympani muscle originates from the auditory tube (or eustachian tube) and inserts onto the manubrium of the ear drum. The stapedius muscle is innervated by the mandibular division of the trigeminal nerve (V), through the trigeminal ganglion.
All muscles produce low-frequency sound during contraction, and the middle ear muscles are no exception. The tensor tympani and stapedius muscles are the source of "physiological noise" during auditory selective attention. This noise is reduced during attention, suggesting that selective attention may reduce physiological noise in the ear canal by reducing the activity of muscles close to the ear.
The role of the middle ear muscles in producing low-frequency sound during contraction has not been extensively studied. However, it is known that the medial olivocochlear system, which connects to the outer hair cells, plays a role in suppressing otoacoustic emissions. The middle ear muscles may also play a role in this process, but the results of studies can be confounded by parallel muscle activity.
Further experiments are needed to fully understand the implications of muscle sound for selective attention experiments, in which muscles near the ear are likely to be active.
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Frequently asked questions
Yes, there are two muscles within the middle ear: the Tensor Tympani and the Stapedius.
The muscles in the ear function to protect it from loud noises. All muscles produce low-frequency sound during contraction, which can be a source of "physiological noise" during auditory selective attention.
The sensitivity of the auditory system is regulated via two major efferent pathways: the medial olivocochlear system that connects to the outer hair cells, and by the middle ear muscles.
