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The human face has about 20 main facial muscles, which are essential for chewing and making facial expressions. While there is no definitive number for how many muscles it takes to smile, the zygomaticus muscles, which pull the orbicularis oris (the circular muscle of your mouth) upwards, are involved with smiling. The risorius muscle is also known as the smile muscle. The zygomaticus major muscle lifts the corners of the mouth, while the orbicularis oculi raises the cheeks and crinkles the eyes.
| Characteristics | Values |
|---|---|
| Number of muscles involved in producing a smile | 2 muscle pairs (4 muscles) or 10 muscles |
| Name of the muscle that produces a smile | Zygomaticus major muscle |
| Other names for the zygomaticus major muscle | Zygomaticus muscle, Risorius, Duchenne smile |
| Origin of the zygomaticus major muscle | Zygomatic arch (cheekbone) |
| Insertion of the zygomaticus major muscle | Corner of the mouth |
| Innervation of the zygomaticus major muscle | Branches of the facial nerve (cranial nerve VII) |
| Function of the zygomaticus major muscle | Raises the upper lip, deepens and raises the nasolabial furrow, draws the angle of the mouth superiorly and posteriorly to produce a smile |
| Other muscles involved in smiling | Zygomaticus minor muscle, depressor anguli oris, levator labii superioris, orbicularis oris |
| Number of main facial muscles | 20 |
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What You'll Learn
The zygomaticus major muscle lifts the corners of the mouth
Smiling is viewed across cultures as a sign of friendliness, especially when greeting someone. It takes several muscles to produce a smile, and one of the most important is the zygomaticus major muscle. This muscle lifts the corners of the mouth, drawing the angle of the mouth superiorly and posteriorly to allow one to smile. It arises from the zygomatic arch (cheekbone) and inserts at the corner of the mouth.
The zygomaticus major muscle is a muscle of facial expression, innervated by the various branches of the facial nerve (VII). When activated, these nerves send signals to the brain that you are smiling. The facial nerve exits the cerebral cortex and emerges from the skull just in front of the ears, then splits into five primary branches: temporal, zygomatic, buccal, mandibular, and cervical. These branches reach different areas of the face and innervate muscles that allow the face to twist and contort into various expressions.
The zygomaticus major muscle works in conjunction with other muscles of facial expression that elevate the lip, such as the levator anguli oris and orbicularis oris muscles. Together, these muscles produce smiles by lifting the corners of the mouth and curling the upper lip to bare the upper teeth. This muscle can also deepen and raise the nasolabial furrow, contributing to facial expressions such as disdain, contempt, or smugness.
The act of smiling, even if it is not genuine, can have physiological and psychological benefits. Activating the muscles associated with smiling can fool the brain into thinking you are happy, leading to the release of endorphins into the bloodstream. These endorphins act as the body's natural painkillers and can help reduce stress levels and increase feelings of calmness.
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The orbicularis oculi raises the cheeks and corners of the eyes
Smiling is a complex process that involves the coordination of various muscles in the face. While there is no definitive answer to the exact number of muscles involved in a smile, it is generally believed that multiple muscles work together to produce this expression.
The orbicularis oculi muscle is a crucial player in the act of smiling. This muscle is responsible for raising the cheeks and the corners of the eyes, adding a distinctive element to our smiles. By lifting the cheeks, the orbicularis oculi contributes to the formation of laugh lines at the outside corners of our eyes. This muscle is an essential component of what is known as the Duchenne smile, named after the 19th-century scientist Guillaume Duchenne, who dedicated his work to mapping the muscles responsible for facial expressions.
The Duchenne smile is considered a genuine smile of true enjoyment, happiness, or joy. It occurs when the zygomaticus major muscle lifts the corners of the mouth, while the orbicularis oculi simultaneously raises the cheeks and causes the crinkling of the eyes. This combination of muscle movements results in a smile that appears trustworthy and generous, often eliciting positive responses from others.
The orbicularis oculi is not the only muscle involved in smiling. The zygomaticus major, for example, is responsible for lifting the corners of the mouth, contributing to the upward curve associated with smiling. Other muscles, such as the risorius, the depressor anguli oris, the zygomaticus minor, and the levator labii superioris, also play their part in creating the overall expression.
The human face typically has about 20 main facial muscles that are essential for chewing and making facial expressions. These muscles work synergistically, meaning they assist each other in producing specific movements. The facial nerve (VII) plays a critical role in smiling by innervating the muscles involved and sending signals to the brain that a smile is occurring. This, in turn, triggers the release of endorphins, the body's natural painkillers, enhancing the positive emotional state associated with smiling.
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The risorius is the smile muscle
Smiling is viewed across cultures as a sign of friendliness, especially when greeting someone. It takes about 4 to 10 muscles to produce a smile, depending on the type of smile. While some smiles may be more of a smirk, others are a Duchenne smile, which involves the eyes and is considered a genuine smile of true enjoyment.
The risorius muscle is the primary muscle responsible for producing smiles. It is one of about 20 main facial muscles that are essential for chewing and making facial expressions. The risorius is specifically involved in moving the corners of the mouth upwards and outward to form a smile.
Other muscles involved in smiling include the zygomaticus muscles (major and minor), which also pull the corners of the mouth upwards. The zygomaticus major muscle lifts the upper lip to bare the upper teeth and is considered a muscle of facial expression. It arises from the cheekbone and inserts at the corner of the mouth, receiving innervation from branches of the facial nerve.
The depressor anguli oris, on the other hand, is a muscle that works with others to produce a frown by pulling the corners of the mouth downwards. The levator labii superioris is another muscle that enables smiling or showing disgust.
Activating the muscles associated with smiling can have physiological and psychological benefits, such as reducing heart rate and stress levels. Even a fake smile can fool your brain into thinking you are happy and trigger the release of endorphins, the body's natural painkillers.
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The depressor anguli oris is a frown muscle
Smiling and frowning are both expressions that are produced by the movement of muscles in the face. There are 43 muscles in the face, most of which are controlled by the seventh cranial nerve, also known as the facial nerve. The depressor anguli oris is one of the muscles involved in facial expression. It is a paired triangular muscle that extends from the mental tubercle of the mandible to the angle of the mouth. It is situated on either side of the mouth and pulls the corners of the mouth downwards. This downward movement is associated with frowning, and the depressor anguli oris is therefore referred to as a "frown muscle".
The depressor anguli oris is supplied by the marginal mandibular branch of the facial nerve and receives motor innervation from the marginal mandibular and buccal branches of the facial nerve. It is also supplied by the inferior labial and mental arteries, which are branches of the facial artery and maxillary artery, respectively. The venous blood is drained through the facial vein into the internal jugular vein.
The depressor anguli oris is one of the muscles that attach at the angle of the mouth, and it forms a fibromuscular structure called the modiolus. The depressor anguli oris is deemed one of the "frowning muscles", along with the corrugator supercilii, procerus, and orbicularis oris muscles. These muscles are all involved in expressing feelings of sadness or anger.
The depressor anguli oris is sometimes referred to as the "sadness muscle" because it is responsible for pulling down the corners of the mouth, which occurs when a person frowns. Issues with this muscle can cause a lopsided smile or excessive frowning. Some people may opt for cosmetic procedures such as Botox injections to change the appearance of a constant frown caused by an overactive depressor anguli oris muscle.
While smiling and frowning are produced by different sets of muscles, it is not entirely clear which muscles are involved in each expression. The number of muscles involved in smiling and frowning can vary depending on the individual's expression, and not everyone has the same number of facial muscles. Some sources state that it takes more muscles to smile than to frown, while others claim that it takes the same amount of effort to produce either expression.
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The levator labii superioris enables smiling or showing disgust
The levator labii superioris (LLS) muscle, also known as the quadratus labii, is a short, paired triangular muscle of the face. It contributes to facial expressions and mouth and upper lip movement. The LLS muscle originates from the lateral nasal aspect, extending laterally toward the zygomatic bone.
The LLS muscle plays a role in creating facial expressions of disgust, sadness, and disdain. It is involved in nasal flaring, retching (vomiting), and oral movements. The muscle helps to elevate the upper lip, exposing the maxillary teeth and deepening the nasolabial lines. This action is important for several facial expressions, including smiling, disdain, and contempt.
The LLS muscle has three distinct origin-insertion pairings: the angular alaeque nasi, the infraorbital, and the zygomatic. The angular head elevates the upper lip and dilates the nostrils, while the infra-orbital head raises the angle of the mouth. The zygomatic head, located in the cheek area, elevates the upper lip laterally, contributing to the smile expression.
The LLS muscle is innervated by the zygomatic and buccal branches of the facial nerve (CN VII). The facial artery and the infraorbital branch of the maxillary artery provide vascular supply to the muscle.
The levator labii superioris is one of several muscles involved in smiling. Other muscles that contribute to smiling include the zygomaticus muscles (major and minor), the risorius, and the orbicularis oris. These muscles work together to pull the corners of the mouth upwards, forming a smile.
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Frequently asked questions
The zygomaticus major muscle lifts the corners of the mouth, producing a smile.
There are 20 main facial muscles, but it is unclear how many are involved in smiling. Some sources say 4, while others say 10.
The risorius, depressor anguli oris, orbicularis oculi, and levator labii superioris muscles are all involved in smiling.
