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The mentalis muscle is a paired central muscle of the lower lip, situated at the tip of the chin. It is involved in expressing doubt and contempt, as it elevates, everts, and protrudes the lower lip, and wrinkles the skin of the chin. The muscle is very thin just superficial to the mandible, and it can be easily assessed using ultrasound. Geniospasm is a genetic movement disorder of the mentalis muscle that involves repetitive contraction, with episodes lasting between seconds and hours.
| Characteristics | Values |
|---|---|
| Muscle shape | Slight cone-shaped |
| Muscle type | Paired central muscle |
| Muscle location | Tip of the chin |
| Muscle function | Elevates the chin and lower lip |
| Muscle innervation | Mandibular branch of the facial nerve |
| Muscle blood supply | Inferior labial branch of the facial artery and mental branch of the maxillary artery |
| Muscle treatment | Botulinum toxin injections for cosmetic purposes or to treat geniospasm |
| Muscle imaging | High-resolution ultrasound |
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What You'll Learn
- The mentalis muscle is involved in expressing doubt and contempt
- It is useful to sample in patients with suspected motor neuron disease
- Geniospasm is a genetic movement disorder of the mentalis muscle
- The muscle is easily assessed using ultrasound
- The mentalis muscle is sometimes referred to as the pouting muscle
The mentalis muscle is involved in expressing doubt and contempt
The mentalis muscle is a paired central muscle of the lower lip, situated at the tip of the chin. It is also referred to as the "pouting muscle" due to its function in raising the lower lip and creating chin wrinkles. The muscle originates from the mental protuberance of the mandible near the midline and inserts into the soft tissue and skin of the chin. This muscle is involved in expressing doubt and contempt by elevating, everting, and protruding the lower lip, as well as wrinkling the skin of the chin.
The mentalis muscle is one of the facial muscles and is important for elevating the chin and lower lip. It is a slight cone-shaped muscle, with its superior fibers intertwining with the inferior fibers of the orbicularis oris muscle. The mentalis muscle is innervated by the mandibular branch of the facial nerve (CN VII) and supplied by the inferior labial branch of the facial artery and the mental branch of the maxillary artery.
The function of the mentalis muscle is not limited to facial expressions. It also plays a role in adjusting the shape of the lips for drinking and, in cases of lip incompetence, can help achieve temporary oral competence. Additionally, the mentalis muscle is useful for sampling in patients with suspected motor neuron disease.
While the mentalis muscle is crucial for expressing doubt and contempt, it is important to note that it works in conjunction with other muscles of facial expression. These include the levator labii superioris alaeque nasi, levator labii superioris, zygomaticus major, zygomaticus minor, risorius, depressor labii inferioris, and orbicularis oris, among others. Together, these muscles enable a wide range of facial expressions involving the lips, chin, and cheeks.
In summary, the mentalis muscle, located in the chin, plays a significant role in expressing doubt and contempt by manipulating the lower lip and creating chin wrinkles. This muscle works in harmony with other facial muscles to produce a diverse range of facial expressions. Additionally, the mentalis muscle has functional significance in drinking and oral competence, as well as diagnostic value in certain medical conditions.
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It is useful to sample in patients with suspected motor neuron disease
The mentalis muscle is a slight cone-shaped muscle located in the chin, with one muscle on each side of the mouth. It is one of the facial muscles and is involved in expressing doubt and contempt by elevating, everting and protruding the lower lip, and wrinkling the skin of the chin.
The mentalis muscle is useful to sample in patients with suspected motor neuron disease (MND). MNDs are a group of progressive neurological disorders that destroy motor neurons, the cells that control skeletal muscle activity such as walking, breathing, speaking, and swallowing. The muscle is very thin just superficial to the mandible, and the needle must be inserted tangentially. The mentalis is innervated by the mandibular branch of the facial nerve (CN VII). The motor unit action potential duration is normally briefer in craniobulbar muscles, including the facial muscles, compared with the limb muscles.
Electromyography and Neuromuscular Disorders (Third Edition) by David C. Preston MD and Barbara E. Shapiro MD, PhD, mentions that small concentric needle electrodes can be placed simultaneously in muscles innervated by different facial nerve branches, with the electromyographer looking for co-contraction. The masseter and temporalis muscles are the most easily accessible to evaluate the motor function of cranial nerve V3, with the use of a small, fine, concentric needle. The mandibular branch of the facial nerve (cranial nerve VII) is also mentioned in the context of the mentalis muscle.
In patients with suspected MND, the mentalis muscle can be sampled to look for evidence of more widespread cranial nerve dysfunction. The motor unit action potentials (MUAPs) in facial muscles tend to be smaller and shorter than those in limb muscles. It is important to be well-practised in the needle examination of facial muscles to avoid mistaking the normally small MUAPs for myopathic motor unit potentials. On needle EMG, myokymic discharges may be seen in the facial muscles of patients with conditions affecting the face and neck area, such as multiple sclerosis, brainstem tumours, or Guillain-Barré syndrome.
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Geniospasm is a genetic movement disorder of the mentalis muscle
The mentalis muscle is a slight cone-shaped muscle located in the chin, with one muscle on each side of the mouth. It is responsible for elevating the chin and lower lip, wrinkling the skin of the chin, and expressing emotions such as sorrow, contempt, and doubt. The muscle is innervated by the mandibular branch of the facial nerve and supplied by the inferior labial branch of the facial artery and the mental branch of the maxillary artery.
Geniospasm is a rare and generally benign genetic movement disorder of the mentalis muscle. It is caused by genetic mutations, which can be inherited from parents or occur randomly during cell division. The condition typically manifests in infancy or early childhood and is characterised by involuntary tremors of the chin and lower lip. These episodes can last from a few seconds to hours and may occur spontaneously or be triggered by stress, excitement, or other emotional factors.
The diagnosis of geniospasm can be challenging due to its rarity, and it may take several years to receive an accurate diagnosis. Multidisciplinary care centres with specialised teams and a wide range of diagnostic tools can be helpful in obtaining a timely and accurate diagnosis. Genetic testing and family health history can also play a crucial role in identifying the presence of pathogenic variants associated with geniospasm.
The standard treatment for geniospasm is regular botulinum toxin injections into the mentalis muscle, which paralyse the muscle without impairing facial expression or speech. This treatment has been shown to be effective in managing the condition and improving symptoms over time. However, complete spontaneous remission of geniospasm is rare, and most cases tend to lessen in frequency and improve with age.
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The muscle is easily assessed using ultrasound
The mentalis muscle is a slight cone-shaped muscle located in the chin, with one muscle on each side of the mouth. It is responsible for elevating the chin and lower lip, and plays a role in expressing emotions such as sorrow, contempt, and doubt. The muscle is thin and lies just superficial to the mandible.
Ultrasound imaging is a safe, non-invasive, and painless method for assessing muscles, tendons, ligaments, nerves, and soft tissues in the body. It is particularly useful for evaluating muscle disorders and myopathies, as it can identify structural abnormalities and assess muscle quality. The use of ultrasound to evaluate muscle conditions is highly adaptable, with both qualitative and quantitative assessments available.
The mentalis muscle can be easily assessed using ultrasound. High-resolution ultrasound images of the mentalis muscle can be obtained to identify structural details and support diagnosis and treatment. This technique is especially valuable for patients with facial palsy or suspected motor neuron disease, as it provides a reliable and non-invasive way to examine the muscle.
During an ultrasound examination, the patient is typically positioned lying face-up or face-down on an examination table. The radiologist or sonographer may ask the patient to move the area being examined or may move it themselves to evaluate the anatomy and function of the muscle. A water-based gel is applied to the examination area to facilitate secure contact with the transducer and eliminate air pockets that could block the sound waves.
Ultrasound imaging of the mentalis muscle can provide valuable information about its structure and function, aiding in the diagnosis and treatment of various conditions associated with this muscle.
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The mentalis muscle is sometimes referred to as the pouting muscle
The mentalis muscle is a paired central muscle of the lower lip, situated at the tip of the chin. It originates from the mentum of the mandible, and inserts into the soft tissue of the chin. The mentalis muscle is sometimes referred to as the "pouting muscle" due to its function of raising the lower lip and causing chin wrinkles. This muscle is involved in producing facial expressions such as doubt and contempt, and it works together with other muscles of the lips, chin, and cheeks to create these expressions.
The mentalis muscle is a slight cone-shaped muscle, also described as a small conical fasciculus, and it arises from the incisive fossa of the mandible. The muscle fibres then pass anteroinferiorly, deep into the oral mucosa of the mouth, before inserting into the skin of the chin. This muscle is one of the few muscles that can elevate the chin and lower lip, providing vertical support for the lower lip.
The mentalis muscle can be visualised using high-resolution ultrasound imaging, and it may appear as a consistently identifiable hypoechoic structure in the mental region. This muscle is also associated with geniospasm, a genetic movement disorder characterised by repetitive contractions that can last from seconds to hours. To treat geniospasm, certain medications can be used, such as haloperidol and benzodiazepines. In some cases, injecting botulinum toxin to partially paralyse the muscle may be more effective in reducing muscle contractions and associated wrinkling of the skin.
The mentalis muscle plays a role in lip incompetence, where the upper and lower lips do not touch at rest. Contraction of the mentalis muscle can temporarily restore oral competence, working in conjunction with the orbicularis oris muscle to achieve this. The ability to elevate the lower lip and chin makes the mentalis muscle an important structure for adjusting the shape of the lips during drinking and expressing emotions such as sorrow, contempt, and doubt, which may be reflected in a "pouting" facial expression.
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Frequently asked questions
The mentalis muscle is a paired central muscle of the lower lip, situated at the tip of the chin. It is sometimes referred to as the "pouting muscle" due to its function in raising the lower lip and creating chin wrinkles.
The mentalis muscle is one of the facial muscles that work together to produce facial expressions involving the lips, chin, and cheeks. It is specifically involved in expressing doubt and contempt by elevating, everting, and protruding the lower lip, and wrinkling the skin of the chin.
The mentalis muscle can be easily assessed using high-resolution ultrasound imaging. It appears as a consistently identifiable hypoechoic structure in the mental region.
