Logan Steele
The human face is a complex signal system that involves many muscles that produce different types of movements and expressions. These facial muscles are a group of about 20 flat skeletal muscles lying just under the skin of the face and scalp. They are essential to chewing and making facial expressions, and they also cause wrinkles. Facial muscles can be categorized by general location, such as buccolabial muscles in and around the mouth, and nasal muscles around the nose. They receive signals from the brain via the facial nerve, and when they contract, the skin moves.
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What You'll Learn
There are 20 facial muscles
The human face has approximately 20 main facial muscles, also known as craniofacial muscles. These muscles are essential for chewing and making facial expressions. They are flat skeletal muscles that lie just beneath the skin of the face and scalp. Most of them originate from the bones or fibrous structures of the skull and radiate outwards to insert into the skin.
Facial muscles can be categorised by their general location. For example, buccolabial muscles are found in and around the mouth, nasal muscles surround the nose, and epicranial muscles are found in the forehead, skull and neck. The specific locations and attachments of the facial muscles enable them to produce a wide range of movements and expressions. For example, the risorius muscle, located on each side of the mouth, aids in smiling. The depressor anguli oris muscle, situated near the chin on each side of the face, contributes to expressing feelings of sadness or anger by depressing the angle of the mouth.
Facial muscles are also involved in more essential functions, such as keeping food and drink in the mouth and protecting the eyes. Damage to these muscles can lead to difficulties in chewing, speaking, or making facial expressions. Facial nerve dysfunction or paralysis can cause a droopy or sagging appearance in the face, known as facial palsy or Bell's palsy. It is important to seek medical attention for any facial weakness or paralysis, as it could indicate a more serious condition such as a tumour or stroke.
The number of muscles involved in making facial expressions, such as smiling or frowning, has been a topic of interest and debate. While it is challenging to determine the exact number, it is believed that a restrained smile or frown involves at least four muscle pairs, or a total of eight muscles.
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Facial muscles control facial expressions
The human face has about 20 main facial muscles, also called craniofacial muscles, which are essential for chewing and making facial expressions. These muscles are flat and skeletal and lie underneath the skin of the face and scalp. They originate from the bones or fibrous structures of the skull and radiate to insert on the skin. The specific location and attachments of the facial muscles enable them to produce movements of the face, such as smiling, grinning, and frowning.
The muscles of the mouth, or buccolabial group, is a broad group of muscles that form a functional compound that controls the shape and movements of the mouth and lips. There are 11 of these muscles, including the levator labii superioris, risorius, and zygomaticus major and minor muscles. The zygomaticus major and minor muscles allow us to smile. The risorius is located on each side of the mouth and also aids in smiling. The levator labii superioris elevates and everts the upper lip, exposing the maxillary teeth and deepening the nasolabial lines. This action is significant in making certain facial expressions, such as smiling, grinning, and expressing contempt.
The depressor anguli oris is a triangular muscle situated lateral to the chin on each side of the face. It acts to depress the angle of the mouth, which contributes to expressing feelings of sadness or anger. The mentalis muscle depresses and everts the base of the lower lip, while also creating wrinkles on the skin of the chin. These actions contribute to certain activities such as shaping the lips while drinking, as well as creating facial expressions to convey feelings of sadness, contempt, and doubt.
The orbicularis oculi is another important muscle for facial expressions, as it closes the eyelids. If the facial nerve becomes damaged, the orbital muscles will cease to function, leading to serious clinical consequences. The eye cannot shut, causing the cornea to dry out, a condition known as exposure keratitis. The lower eyelid droops, and lacrimal fluid pools in the lower eyelid, impacting the removal of debris and leading to potential corneal ulceration.
Facial expression is a critical form of nonverbal social communication that promotes emotional exchange and affiliation among humans. The production of facial expressions involves the precise contraction of the facial muscles, guided by sensory feedback. Facial expression behavior is stimulated by visual, affective, and appetitive stimuli, and the facial sensorimotor network interacts with various brain systems, including vision, audition, and emotion.
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Facial muscles are derived from neural crest cells
The human face has about 20 facial muscles, also known as craniofacial muscles, which are essential for chewing and making facial expressions. These muscles are located around the facial openings, such as the mouth, eyes, nose, and ears, and stretch across the skull and neck.
During early facial development, neural crest cells play a crucial role in shaping the face. These cells exhibit oriented divisions and crowd movements, contributing to the formation of ectomesenchyme-derived tissues. The early face is constructed from overlapping ectomesenchymal clones, which remain oligopotent and generate various tissues in specific locations.
The interactions between neural crest cells and muscle cells are particularly important in understanding craniofacial malformations. For example, in the development of the jaw, neural crest cells migrate in close association with cranial mesoderm, defining a boundary between neural crest cells and mesodermal muscle progenitor cells. The skeletal elements of the jaw and associated connective tissues and tendons originate from neural crest cells, while the muscles themselves are derived mainly from cranial mesoderm.
In summary, facial muscles are indeed derived from neural crest cells, which are essential for the development and shaping of the head and face. The intricate interactions between neural crest cells and muscle cells contribute to the formation of the complex craniofacial structures that enable crucial functions such as chewing and facial expressions.
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Facial muscles can be damaged by trauma
The human face has about 20 main facial muscles, also known as craniofacial muscles, which are essential for chewing and making facial expressions. These muscles are located around the facial openings, such as the mouth, eyes, nose, and ears, and stretch across the skull and neck. They work together to control the parts of our face, allowing us to make various expressions, chew, and perform other functions.
When it comes to the upper face, trauma can result in difficulties closing the eye. The orbicularis oculi muscle, responsible for closing the eyelids, can be damaged, leading to an inability to close the eye. Lower facial muscle injuries can cause difficulties in eating and drinking. For instance, the orbicularis oris muscle controls the movement of the lips, and injury to this muscle can lead to challenges in drinking and keeping food in the mouth.
Facial trauma can also cause nerve damage, affecting sensation and functions such as smiling, blinking, swallowing, biting, and chewing. Nerve damage can result in severe cases of Bell's palsy, where swelling puts pressure on the facial nerve, causing facial weakness or paralysis. In addition, trauma to the face can lead to thermal or chemical burns, eye injuries, and damage to the salivary glands, which can further impair functions like eating and speaking.
It is important to seek medical attention for any facial weakness or paralysis, as it could indicate a temporary condition or a more serious medical problem.
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Facial muscles can be categorised by location
The human face has about 20 flat skeletal muscles, also known as craniofacial muscles, that lie beneath the skin of the face and scalp. These muscles are essential for chewing and making facial expressions. They can be categorised by location, as follows:
Buccolabial Muscles
These are the muscles in and around the mouth. The buccinator muscle, for example, is a thin, square-shaped muscle located between the mandible and maxilla. It pulls the cheek inwards against the teeth, preventing food accumulation in the area. The orbicularis oris is another muscle in this category. It is a circular muscle that surrounds the mouth and forms the majority of the lips. The risorius, depressor anguli oris, and mentalis muscles are also part of the buccolabial group.
Nasal Muscles
Nasal muscles are those around the nose.
Epicranial Muscles
Epicranial muscles are those of the forehead, skull, and neck. The occipitofrontalis is an example of an epicranial muscle. It extends from the eyebrows to the top of the skull and enables actions such as raising the eyebrows and wrinkling the forehead.
Auricular Muscles
Auricular muscles are those around the ears. Some people can move their ears using these muscles.
Orbital Muscles
The orbital muscles surround the eyes. The orbicularis oculi muscle, for instance, surrounds the eye socket and extends into the eyelid. It has three parts: palpebral, lacrimal, and orbital. The palpebral part closes the eyelids, the lacrimal part is involved in tear drainage, and the orbital part tightly closes the eyelids.
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Frequently asked questions
Facial muscles, also known as craniofacial muscles, are a group of about 20 flat skeletal muscles lying just under the skin of the face and scalp. They are essential for chewing and making facial expressions.
The facial muscles can be categorized by their general location into five groups:
- Buccolabial (oral) group: Risorius, zygomaticus major, and zygomaticus minor, among others.
- Nasal group: Nasalis and procerus muscles.
- Orbital group: Orbicularis oculi and corrugator supercilii muscles.
- Epicranial group: Occipitofrontalis and platysma muscles.
- Auricular group: Auricularis anterior, auricularis superior, and auricularis posterior muscles.
The facial muscles control facial expressions and enable movements such as smiling, grinning, frowning, and pouting. For example, the risorius muscle, located on each side of the mouth, aids in smiling, while the depressor anguli oris muscle depresses the angle of the mouth, contributing to expressions of sadness or anger.
Issues with the facial muscles can range from temporary conditions to serious medical problems. Facial nerve damage can lead to paralysis of the facial muscles, which may be caused by a stroke, Bell's palsy, or parotid salivary gland cancer. Weakness or paralysis of the facial muscles can also impact basic functions such as smiling, talking, or eating. If you experience any facial weakness or paralysis, it is important to seek medical attention right away.
