Dominic Stone
Humans have three muscles attached to the external ear that allow for ear movement. These muscles are vestigial, meaning they are remnants of evolution that once allowed our evolutionary ancestors to pivot their ears to and fro. While modern human ears are firm and their muscles are weak, some people have a greater degree of control over these muscles and can wiggle their ears. These vestigial muscles are intriguing because they activate in response to positive emotions, and they may also indicate the direction of sounds a person is paying attention to.
| Characteristics | Values |
|---|---|
| Number of muscles attached to the ear | 3 |
| Muscle that still displays an active reflex | Transversus auriculae |
| Muscle that controls the movement of the human ear | Transverse Auricular Muscle (TAM) |
| Ear movement in humans | Rare |
| Ear movement in animals | Used to rotate the ear towards the source of a sound |
| Ear movement in humans | Used to indicate the direction of sounds a person is paying attention to |
| Ear movement in animals | Used to express emotions |
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What You'll Learn
- Humans have vestigial ear muscles that are evolutionary remnants
- Ear muscles are tiny and weak, making it hard to move the ears
- Some people can wiggle their ears by focusing on specific muscles
- Transverse Auricular Muscle (TAM) controls subtle human ear movements
- Ear muscles can be exercised and trained to gain better control
Humans have vestigial ear muscles that are evolutionary remnants
The existence of these vestigial muscles was first noted in the early 1900s, but it wasn't until recently that researchers at Saarland University in Germany found concrete evidence of their existence and function. By studying electrode recordings, they observed that when sounds came from behind participants, their posterior auricular muscles were activated more than when sounds were played directly in front of them. This reflex is hypothesized to be a now-vestigial trait that once helped our ancestors detect sounds from outside their field of view.
The auricular muscles of the human ear include the anterior auricular muscle, the superior auricular muscle, and the posterior auricular muscle. Together, they control the pinna, or the visible part of the ear. In many mammals, ear movements produced by these muscles play a role in sound localization and the expression of emotion, but in humans, they are considered vestigial.
Charles Darwin, in his 1871 work "The Descent of Man," listed the muscles of the ear as one of several putative human vestigial features, along with wisdom teeth, the appendix, the tailbone, body hair, and the semilunar fold in the corner of the eye. Darwin's observations highlight the sporadic nature of vestigial features, particularly in musculature.
While humans have largely lost the ability to move their ears, some individuals can wiggle their ears voluntarily through repeated effort and training. These muscles, though considered evolutionary remnants, may still have a function in helping humans to orient their ears toward relevant sounds, as seen in the study where participants' ear muscles responded to sounds from behind them.
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Ear muscles are tiny and weak, making it hard to move the ears
The muscles that move our ears are tiny and weak, making it hard for humans to move their ears. These muscles are vestigial, meaning they are remnants of evolution that once allowed our evolutionary ancestors to pivot their ears. While some people have a degree of control over these muscles, allowing them to wiggle their ears, most humans find it difficult.
The Transverse Auricular Muscle (TAM), for example, is a small, flat muscle located in the temporal region of the skull that controls subtle ear movements. Genetics play a role in determining an individual's ability to voluntarily move their ears. Some people may have better control over certain ear muscles than others.
The existence of these vestigial muscles adds to the story of our evolutionary history. Early mammals likely developed ear-orienting abilities more than 150 million years ago. As our primate ancestors evolved to rely more on vision than sound, we lost the ability to orient our ears, but the circuits for ear orientation remained in our nervous system.
Today, the tiny involuntary movements of the ear muscles can indicate a person's attention direction towards sounds. These movements are known as vestigial auriculomotor activity, and they showcase the complexity and adaptability of the human ear. While these movements may not serve a critical purpose in modern life, they provide an interesting glimpse into our evolutionary past.
In conclusion, the ear muscles are indeed tiny and weak in humans, making voluntary ear movement a challenging skill to master. However, these muscles still play a subtle yet crucial role in our auditory system, and their study has provided valuable insights into our evolutionary history and the potential for better hearing aid technology.
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Some people can wiggle their ears by focusing on specific muscles
Humans usually find it difficult to wiggle their ears. However, some people can wiggle their ears by focusing on specific muscles. The external ear is moved using three muscles attached to it: forward, above, and behind. These muscles are the auricularis superior, the auricularis anterior, and the posterior auricular.
Research has shown that humans still have the neural circuitry that allowed their mammalian ancestors to control the movement of their ears. While some people have the uncanny ability to wiggle their ears, others might have to train their facial muscles to gain control over their ear muscles.
To wiggle your ears, you can start by training your facial muscles to gain better control over your muscle movements. You can dart your eyes from side to side, move your eyebrows, or furrow your brows. You can also try pressing your hand to your eyebrows and the other hand to your forehead, and then try wiggling. Alternatively, you can try jumping or hopping up and down while shaking your head.
It is important to remember that wiggling your ears is a pointless skill, so the muscles required to do so are likely to be weak. However, with practice, it is possible to gain control over these muscles and learn to wiggle your ears.
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Transverse Auricular Muscle (TAM) controls subtle human ear movements
The human ear has three extrinsic auricular muscles and six intrinsic auricular muscles. The transverse auricular muscle (TAM) is one of the six intrinsic auricular muscles. The TAM is an intrinsic muscle of the outer ear, located on the cranial surface of the pinna. It consists of scattered fibres, partly tendinous and partly muscular, extending from the eminentia scapha to the prominence corresponding with the scapha.
The TAM modifies the auricular shape only minimally in most individuals. However, it may help flatten the cranial profile of the auricular cartilage. The TAM is developmentally derived from the second pharyngeal arch.
While humans usually find it difficult to voluntarily control their ear muscles, some people have the uncanny ability to wiggle their ears. Research has shown that others can acquire this ability through training with an early form of biofeedback.
The existence of ear-orienting neural circuits in humans suggests that we evolved from species whose ears could pivot and curl. While modern human ears are firm and their muscles are weak, some individuals' ear muscles may unconsciously try to orient their ears toward relevant sounds.
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Ear muscles can be exercised and trained to gain better control
The first step is to identify the muscles involved in ear movement. There are three muscles attached to the external ear that enable this movement: the auricularis anterior, posterior, and superior. The auricularis anterior lifts the ear upward and towards the face, while the auricularis posterior pulls the ear towards the back of the head.
To begin training these muscles, it is recommended to start by training the facial muscles to gain better control over individual muscle movements. This can be done by darting your eyes from side to side, moving your eyebrows up and down, or clenching and unclenching your jaw.
Once you have warmed up your facial muscles, stand in front of a mirror and focus on moving your ears backward, forward, or upward. You can try different facial expressions, such as smiling or grinning, to observe how your ears respond. Concentrate on isolating the muscles around your ears and try to move them independently.
It is important to note that not everyone will be able to wiggle their ears, even with practice. Some people may lack the vestigial muscle that enables ear movement. However, for those who can gain control over these muscles, it is a unique and interesting skill to possess.
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Frequently asked questions
The Transverse Auricular Muscle (TAM) is a small, flat muscle located in the temporal region of the skull. It is part of the auricular muscles that control the movement of the human ear.
Modern human ears are firm and their ear muscles are too weak to move them. Humans began to rely more on vision than sound to pinpoint important stimuli, so the ability to move our ears became redundant.
The muscles are remnants of evolutionary adaptation. They are evidence that we evolved from species that utilized their ears to assess important, loud, or startling noises, and to express emotions.
