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The human face has about 20 muscles, which are essential for chewing and making facial expressions. One such muscle is the mentalis, a paired central muscle of the lower lip, situated at the tip of the chin. Contraction of the mentalis muscle causes wrinkling and dimpling of the skin on the chin, as used in expressions of doubt or displeasure. It is sometimes referred to as the pouting muscle as it raises the lower lip and causes chin wrinkles. Another muscle that is involved in depressing the chin is the digastric muscle, which helps to open the mouth by lowering the mandible.
| Characteristics | Values |
|---|---|
| Name of the muscle that depresses the chin | Depressor anguli oris (also known as the triangularis) |
| Location | Side of the chin |
| Function | Pulls down on the corner of the mouth, works with other muscles to produce a frown |
| Other muscles that can depress the chin | Mentalis, platysma |
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What You'll Learn
- The mentalis muscle is a central muscle of the lower lip, situated at the tip of the chin
- Depressor anguli oris is a muscle on the side of the chin that helps produce a frown
- The platysma muscle is the muscle closest to the surface, covering the front of the neck
- The digastric muscle assists in jaw movement and can be located by placing a finger under the chin
- The chin can be jutted forward and the head tilted upwards to relieve tension in the digastric muscle
The mentalis muscle is a central muscle of the lower lip, situated at the tip of the chin
The human face has about 20 facial muscles on each side, which are essential for chewing and making facial expressions. Facial muscles are located throughout the face, including the ears, mouth, forehead, nose, and eyes. These muscles are striated muscles that link the facial skin to the skull bone.
Contraction of the mentalis muscle can be easily assessed using ultrasound, and it can be partially paralysed using botulinum toxin to reduce wrinkling for cosmetic purposes. Geniospasm is a genetic movement disorder of the mentalis muscle, involving repetitive contraction episodes lasting from seconds to hours. Certain medications, such as haloperidol and benzodiazepines, can be used to treat this condition.
The mentalis muscle is an important part of the facial muscle group, which helps shape the sound and air stream into recognisable speech. Actors and other performers often work to learn how to isolate and control individual muscles like the mentalis to ensure that only the desired muscles are engaged when expressing thoughts, feelings, and emotions.
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Depressor anguli oris is a muscle on the side of the chin that helps produce a frown
The human face has about 20 facial muscles on each side, which help with chewing and making facial expressions. One such muscle is the depressor anguli oris, which is located on the side of the chin and helps produce a frown. It pulls down on the corner of the mouth and works with other muscles to produce a frown. This muscle is also known as the triangularis and is a continuation of the platysma muscle, which covers the front of the neck.
The depressor anguli oris is one of the muscles of facial expression, also known as mimetic muscles. These muscles are considered extensions of the face's superficial musculoaponeurotic system (SMAS). The SMAS runs from the neck platysma up to the galea aponeurotica and temporoparietal fascia under the scalp. The depressor anguli oris is a facial expression muscle that helps to produce a frown by pulling down the corner of the mouth.
Other muscles that contribute to frowning include the corrugator supercilii, which depresses the eyebrows and causes vertical glabellar rhytides, often referred to as "frown lines" or "number 11s". The orbicularis oculi muscles also contribute to frowning by depressing the brows and producing "crow's feet" wrinkles at the corners of the eyes.
The depressor anguli oris works in conjunction with other muscles to produce a frown. For example, the corrugator supercilii muscle depresses the eyebrows, while the orbicularis oculi muscle depresses the brows and creates "crow's feet" wrinkles. These muscles work together to create the overall expression of a frown.
It's important to note that while the depressor anguli oris contributes to frowning, it also plays a role in other facial expressions and movements. It is involved in shaping the sound and airstream during speech, as well as expressing thoughts, feelings, and emotions. Understanding the role of this muscle and its interaction with other facial muscles can be useful in fields such as acting, where isolating and controlling specific muscles is a carefully learned skill.
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The platysma muscle is the muscle closest to the surface, covering the front of the neck
The platysma is one of about 20 facial muscles that we need to chew and make facial expressions. Facial muscles are striated muscles that link the facial skin to the skull bone. They are located anywhere behind the skin of the face, from the scalp above the forehead down to the skin on the neck. Facial muscles include muscles in the ears, mouth, forehead, nose, and eyes.
The platysma is also one of the muscles of facial expression, which outnumber the mastication muscles. These muscles are considered extensions of the face's superficial musculoaponeurotic system (SMAS). The SMAS runs from the neck platysma up to the galea aponeurotica and temporoparietal fascia under the scalp.
While the platysma is the muscle closest to the surface of the neck, other muscles are involved in depressing the chin. The mentalis is an unpaired chin muscle that permits lower lip protrusion. It is a paired central muscle of the lower lip, situated at the tip of the chin. Contraction of the mentalis muscle causes wrinkling and dimpling of the skin on the chin, as used in expressions of doubt or displeasure.
The digastric muscle is one of six key muscles that assist in the movement of the human jaw. It helps to open the mouth by lowering the mandible. The lateral pterygoid muscle is the sole muscle of mastication that causes depression of the mandible.
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The digastric muscle assists in jaw movement and can be located by placing a finger under the chin
The digastric muscle, or digastricus, is one of six key muscles that assist in the movement of the human jaw. It helps to open the mouth by lowering the mandible, or jawbone. The digastric muscle can be located by placing a finger under the chin and trying to open the mouth against the finger's gentle resistance. This action will cause the contraction of the anterior belly of the digastric muscle, which can be felt just under the chin.
To further identify the digastric muscle, place another finger on the mastoid process, which is the large, round bony bump behind the earlobe. The contractions felt in both areas are the anterior and posterior bellies of the digastric muscle. The digastric muscle is part of the suprahyoid muscle group, which also includes the mylohyoid and geniohyoid muscles. These muscles work together to depress the mandible, or jawbone, against resistance when the infrahyoid muscles fix or depress the hyoid bone.
The digastric muscle is involved in jaw movement and can assist in opening the jaw, along with the mylohyoid and anterior digastric muscles. These muscles run from the hyoid bone to the inner aspect of the mandible, or jawbone. By contracting these muscles, the jaw can be opened and the chin protruded.
The digastric muscle is susceptible to various conditions and injuries, including muscle tears, sprains, and overuse injuries. Pain or discomfort in this muscle may be indicative of underlying issues such as myopathy, atrophy, infectious myositis, lacerations, contusions, or neuromuscular diseases. In some cases, specific exercises can help relieve tension in the digastric muscle. For example, an exercise called the resisted digastric jaw protrusion involves pushing the bottom of the jaw forward using resistance from the hand. This strengthening exercise can be performed in repetitions to improve jaw strength and potentially reduce tension in the digastric muscle.
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The chin can be jutted forward and the head tilted upwards to relieve tension in the digastric muscle
The digastric muscle is a small muscle located under the jaw. It has two bellies, the anterior belly and the posterior belly, that attach to the hyoid bone and mandible, assisting in mandible movement. The primary function of the digastric muscle is to elevate the hyoid bone, a small, horseshoe-shaped bone between the thyroid cartilage and chin. By elevating the hyoid bone, the digastric muscle depresses or lowers the mandible, helping to open the mouth and assisting in swallowing.
The digastric muscle can be the source of pain or discomfort due to muscle tears, sprains, or injuries caused by overuse. Conditions that can affect the digastric muscle include myopathy, atrophy, infectious myositis, lacerations, contusions, or neuromuscular diseases.
To relieve tension in the digastric muscle, one can try the following exercise: jut your chin forward and tilt your head slightly upwards. Place the tips of both thumbs under your chin, one thumb in front of the other. Then, place the tip of your tongue against the roof of your mouth, gradually increasing the pressure of your tongue while holding your thumbs firmly against the muscle. Hold this position for ten seconds and repeat the exercise three times.
Another exercise to relieve tension in the digastric muscle is the resisted digastric jaw protrusion exercise. This involves pushing the bottom of your jaw forward, using resistance from your hand. This exercise strengthens the jaw muscles, including the digastric muscle. It is recommended to perform ten repetitions, three times per day.
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Frequently asked questions
The mentalis muscle is a central muscle of the lower lip that pulls the chin down.
The mentalis muscle is situated at the tip of the chin.
The mentalis muscle raises the lower lip and causes chin wrinkles.
The mentalis muscle can be identified by contractions, which cause wrinkling and dimpling of the skin on the chin.
To relieve tension in the mentalis muscle, try jutting your chin forward and tilting your head slightly upwards. Place the tips of both thumbs under your chin, one in front of the other, and push your tongue against the roof of your mouth.
