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The mentalis muscle is a paired muscle, with one muscle on each side of the mouth. It is located in the chin and is responsible for elevating the chin and lower lip. The mentalis muscle is involved in expressing emotions such as sorrow, contempt, and doubt, as it moves the lower lip and wrinkles the skin of the chin. The muscle is also important for drinking, as it adjusts the shape of the lips.
| Characteristics | Values |
|---|---|
| Location | On the mandible, on each side of the frenulum of the lower lip |
| Function | Elevates, everts and protrudes the lower lip, and wrinkles the skin of the chin |
| Innervation | Mandibular branch of facial nerve (CN VII) |
| Arterial Supply | Inferior labial branch of facial artery and mental branch of the maxillary artery |
| Facial Expressions | Sorrow, contempt, doubt, and drinking |
| Ultrasound | Can be easily assessed using ultrasound |
| Geniospasm | A genetic movement disorder of the mentalis muscle involving repetitive contractions |
| Treatment | Haloperidol, benzodiazepines, or injection of botulinum toxin |
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What You'll Learn
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 originates from the mental protuberance of the mandible near the midline and inserts into the soft tissue and skin of the chin. It is sometimes referred to as the "pouting muscle" due to its function in raising the lower lip and causing chin wrinkles. This muscle is involved in expressing doubt and contempt, as it elevates, everts and protrudes the lower lip, and wrinkles the skin of the chin. This movement adjusts the shape of the lips for drinking and expresses emotions such as sorrow, contempt, and doubt.
The mentalis muscle is innervated by the mandibular branch of the facial nerve (CN VII). The inferior labial branch of the facial artery and the mental branch of the maxillary artery supply the mentalis muscle. The superolateral part of the mentalis muscle is covered by the depressor labii inferioris muscle, while the remainder of the muscle bellies is subcutaneous.
The mentalis muscle is the only elevator of the lower lip and the chin, providing major vertical support for the lower lip. It works together with other buccolabial muscles of facial expression to produce facial expressions that involve the lips, chin, and cheeks. The contraction of the mentalis muscle can bring temporary oral competence in cases of lip incompetence, where the upper and lower lips do not touch at rest.
Geniospasm is a genetic movement disorder of the mentalis muscle characterised by repetitive muscle contractions. Treatments for geniospasm may include medications such as haloperidol and benzodiazepines, or the injection of botulinum toxin to temporarily paralyse the muscle and reduce wrinkling of the skin.
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It is also 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 is involved in expressing doubt, sorrow, contempt, and dissatisfaction, as it elevates, everts, and protrudes the lower lip, and wrinkles the skin of the chin. This muscle is also referred to as the "pouting muscle" because of its ability to raise the lower lip and cause chin wrinkles, similar to a "duck face".
The mentalis muscle originates from the mental protuberance of the mandible near the midline and inserts into the soft tissue and skin of the chin. It causes a weak upward-inward movement of the soft tissue complex of the chin, raising the central portion of the lower lip. This muscle is the only elevator of the lower lip and the chin, providing major vertical support for the lower lip. In the case of lip incompetence, where the upper and lower lips do not touch at rest, the contraction of the mentalis muscle can restore oral competence, albeit temporarily and with strain.
The mentalis muscle works in conjunction with the orbicularis oris muscle, which controls the upper lip, to produce a pouting expression. The orbicularis oris muscle is responsible for producing various movements of the mouth, such as pouting, puckering, and twisting, which facilitate speech and contribute to different facial expressions. The contraction of the mentalis muscle, along with the orbicularis oris, results in the characteristic pouty appearance.
The mentalis muscle can be easily assessed using ultrasound, and its function can be affected by certain disorders or treatments. Geniospasm, for example, is a genetic movement disorder characterised by repetitive contractions of the mentalis muscle. This condition can be treated with medications such as haloperidol and benzodiazepines, or by injecting botulinum toxin to temporarily paralyse the muscle and reduce chin wrinkling for cosmetic purposes.
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Geniospasm is a genetic movement disorder of the mentalis muscle
The mentalis muscle is a paired conical facial muscle located in the chin. It is one of the buccolabial muscles of facial expression, responsible for producing facial expressions that involve the lips, chin, and cheeks. This muscle is involved in expressing doubt and contempt, as it elevates, everts, and protrudes the lower lip, and wrinkles the skin of the chin.
Hereditary geniospasm is caused by genetic mutations, which can be passed down from parents to children or occur randomly during cell division. These mutations result in abnormal lower lip morphology, abnormal social behaviour, and abnormality of the mentalis muscle, leading to involuntary tremors of the chin and lower lip. The condition can be diagnosed through multidisciplinary care centres that have teams of medical experts and specialists working together.
While complete spontaneous remission of geniospasm is rare, the condition can be effectively treated with regular botulinum toxin injections, which paralyse the mentalis muscle without impairing facial expression or speech. Other medications, such as haloperidol and benzodiazepines, may also be used to manage the disorder.
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The mentalis muscle is supplied by the inferior labial branch of the facial artery
The mentalis muscle is a short, paired, conical facial muscle located in the chin. It is part of the buccolabial muscles of facial expression, which are responsible for producing facial expressions that involve the lips, chin, and cheeks. The mentalis muscle is involved in expressing doubt and contempt, as it elevates, everts, and protrudes the lower lip, and wrinkles the skin of the chin. This muscle originates from the incisive fossa of the mandible, near the midline, and inserts into the soft tissue and skin of the chin.
In addition to the inferior labial branch, the mentalis muscle also receives blood supply from the mental branch of the maxillary artery (via the inferior alveolar artery). This branch of the maxillary artery contributes to the vascularization of the mentalis muscle. The maxillary artery is involved in supplying blood to various structures in the head and neck region.
The mentalis muscle is innervated by the mandibular branch of the facial nerve (CN VII). This nerve provides the necessary electrical impulses for the muscle to function properly and facilitate movements associated with facial expressions. The mandibular branch of the facial nerve plays a crucial role in the mentalis muscle's ability to elevate the lower lip and wrinkle the skin of the chin.
Understanding the blood supply and innervation of the mentalis muscle is important for both anatomical knowledge and clinical applications. For example, in the condition known as lip incompetence, where the upper and lower lips do not touch at rest, the contraction of the mentalis muscle can bring temporary oral competence. Additionally, the mentalis muscle can be targeted with botulinum toxin injections to reduce chin wrinkling for cosmetic purposes or to treat movement disorders such as geniospasm.
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The muscle is assessed using ultrasound
The mentalis muscle is a paired central muscle of the lower lip, located at the tip of the chin. It is involved in making facial expressions, such as doubt, sorrow, contempt, and "pouting". It is also the only elevator of the lower lip and chin, providing major vertical support for the lower lip.
The mentalis muscle can be assessed using ultrasound, which is a safe, non-invasive, and painless procedure that does not use ionizing radiation. Ultrasound imaging uses sound waves to produce pictures of muscles, tendons, ligaments, nerves, and joints throughout the body. It is particularly useful for examining soft tissue structures, as it can provide greater internal detail compared to MRI scans. It is also faster and does not require the patient to remain completely still, making it ideal for imaging infants and children.
During an ultrasound exam, the patient is typically positioned lying face-up or face-down on an examination table. A water-based gel is applied to the area being examined to help the transducer make secure contact with the skin and eliminate air pockets that can block the sound waves. The radiologist or sonographer may ask the patient to move the extremity being examined or may move it themselves to evaluate the anatomy and function of the joint, muscle, ligament, or tendon.
In the case of the mentalis muscle, high-resolution ultrasound of the chin can be used to identify any disorders or abnormalities. For example, geniospasm, a genetic movement disorder of the mentalis muscle, can be diagnosed using ultrasound. Ultrasound imaging can also guide the injection of botulinum toxin into the mentalis muscle for cosmetic purposes or to treat movement disorders.
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Frequently asked questions
The mentalis muscle is a paired muscle, with one on each side of the mouth. It is located in the chin and is responsible for elevating the chin and lower lip.
The mentalis muscle is involved in expressing doubt and contempt by elevating, everting and protruding the lower lip, and wrinkling the skin of the chin. It is sometimes referred to as the "pouting muscle".
The mentalis muscle can be easily assessed using ultrasound.
