Dominic Stone
The human face has about 20 facial muscles, also known as craniofacial muscles, which are essential for chewing and making facial expressions. They are a group of flat skeletal muscles that lie underneath the skin of the face and scalp. The facial muscles are supplied by the facial nerve (cranial nerve VII), with each nerve serving one side of the face. These muscles are also called mimetic muscles and are only found in mammals. They originate from bone or fascia and insert into the skin, attaching to the dermis.
Explore related products
What You'll Learn
Facial muscles are a group of 20 flat skeletal muscles
The human face is a unique aspect of each individual, with many structures that contribute to the display of emotions, feeding, seeing, smelling, and communicating. The face has about 20 facial muscles, also known as craniofacial muscles, that work together to control the parts of your face. These muscles are essential for chewing and making facial expressions. They are supplied by the facial nerve (cranial nerve VII), with each nerve serving one side of the face.
Facial muscles are a group of striated, flat skeletal muscles that lie underneath the skin of the face and scalp. They are the only muscles that attach to the dermis. These muscles are also called mimetic muscles and are only found in mammals, although they derive from neural crest cells found in all vertebrates. An inability to form facial expressions on one side of the face may be the first sign of damage to the nerve of these muscles.
The muscles of the face can be divided into three main regions: the upper face, middle face, and lower face. The upper face contains the procerus muscle, occipitofrontalis muscle, depressor supercilii muscle, corrugator supercilii muscle, and the temporalis muscle. The large muscle of the forehead is sometimes omitted during facial reconstruction as it is thin and does not significantly contribute to the overall contours of the face. The contraction of the temporalis muscle results in the elevation and retraction of the mandible.
The middle face contains the buccolabial group of muscles, which are the muscles of the mouth. There are 11 of these muscles, and they control the shape and movements of the mouth and lips. The lower face contains the masseter muscle, which is the strongest muscle in the human body, running from the cheekbone to the lower jaw and bringing the teeth together to grind food.
Muscle Glycogen Storage: What, Why, and How?
You may want to see also
Explore related products
They are supplied by the facial nerve (cranial nerve VII)
The human face typically has around 20 facial muscles, also known as craniofacial muscles, that are essential for chewing and making facial expressions. These muscles are striated skeletal muscles, which attach to different places on the skull and insert into the skin. They are found anywhere from behind the skin of the face, the scalp above the forehead, to the skin on the neck.
The facial muscles are supplied by the facial nerve, also known as cranial nerve VII, with each nerve serving one side of the face. The facial muscles are the only muscles that attach to the dermis. They control facial expressions and are essential for chewing. An inability to form facial expressions on one side of the face may be the first sign of damage to the nerve of these muscles.
The muscles of the mouth, or the buccolabial group of muscles, is a broad group of muscles that form a functional compound that controls the shape and movement of the mouth and lips. There are 11 of these muscles.
The deeper muscles of mastication, namely the temporalis, masseter, and pterygoid muscles, are drained by veins leading to the pterygoid plexus, which empties into the retromandibular vein and cavernous sinus. The masseter is the strongest muscle in the human body. The contraction of the temporalis muscle results in the elevation and retraction of the mandible.
CNs VII and V3 control other muscles besides these groups, and their dysfunction can be debilitating. Functional impairment of these nerves reduces quality of life. A transected CN VII is ideally repaired via primary neurorrhaphy or cable grafting within 72 hours after the injury.
Build Muscle, Burn Fat: Strategies for a Lean Body
You may want to see also
Explore related products
Facial muscles control facial expressions
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 flat skeletal muscles that attach to different parts of the skull. They originate from bone or fascia and insert into the skin. Facial muscles are located throughout the face, including the ears, mouth, forehead, nose, and eyes. They run underneath the skin, from the scalp down to the neck, and are typically paired, with one muscle on each side of the face.
The muscles of the face work together to control movements in different parts of the face. For example, the buccolabial group of muscles, which includes the buccinator and orbicularis oris, controls the shape and movements of the mouth and lips. The auricular muscles around the ears allow some people to move their ears. The nasal muscles of facial expression, such as the procerus and depressor septi nasi, are involved in pulling the eyebrows down and widening the nasal opening, respectively.
The contraction of facial muscles is what enables us to make facial expressions. These expressions are a critical form of nonverbal social communication that promotes emotional exchange and affiliation among humans. For instance, the levator labii superioris muscle enables us to smile or show disgust, while the depressor anguli oris muscle works with other muscles to produce a frown.
While the neural pathways underlying facial motor control are well understood in humans and primates, the specific mechanisms guiding muscle contraction during facial expressions are still being studied. This knowledge gap hinders the effective treatment of atypical facial expressivity observed in various clinical disorders. Nonetheless, it is clear that facial muscles play a crucial role in controlling facial expressions and facilitating social interaction.
Cholonerics and Muscle Function: The Performance Connection
You may want to see also
Explore related products
They are also called mimetic muscles
The human face has about 20 facial muscles, also called craniofacial muscles, which are essential for chewing and making facial expressions. They are also referred to as mimetic muscles, as they enable movements of the face, such as smiling, grinning, and frowning. These muscles are controlled by the facial nerve (Cranial Nerve VII), with each nerve serving one side of the face. An inability to form facial expressions on one side of the face may be the first sign of damage to the nerve of these muscles.
Facial muscles are derived from the second branchial/pharyngeal arch and typically begin forming around the eighth week of embryonic development. They are the only muscles that attach to the dermis, originating from bone or fascia and inserting into the skin. The anatomy of the face can be divided into three main regions: the upper face, middle face, and lower face. The upper face muscular layer is underneath the fat pads and includes muscles such as the procerus muscle, occipitofrontalis muscle, depressor supercilii muscle, corrugator supercilii muscle, and temporalis muscle. The contraction of the temporalis muscle results in the elevation and retraction of the mandible.
The middle face region includes the buccolabial group of muscles, which form a functional compound that controls the shape and movements of the mouth and lips. There are 11 muscles in this group, including the depressor anguli oris, a triangular muscle situated on each side of the face lateral to the chin. The lower face region contains the deeper muscles of mastication, such as the masseter, the strongest muscle in the human body, which runs from the cheekbone to the lower jaw, enabling the grinding of food.
Facial muscles are unique to each individual and contribute to personal identity. They play a crucial role in displaying emotions, feeding, seeing, smelling, and communicating. Various procedures can injure the facial nerves, leading to temporary or permanent muscle weakness. Understanding the anatomy and function of facial muscles is essential for facial surgery and forensic facial reconstruction.
Muscle Soreness: Quick and Effective Recovery Techniques
You may want to see also
Explore related products
Facial muscles are derived from neural crest cells
The human face has about 20 main facial muscles, also called craniofacial muscles, that are essential for chewing and making facial expressions. These muscles are flat and skeletal and attach to different places on the skull. They originate from bone or fascia and insert into the skin.
Neural crest cells generate the scaffold upon which the head and face are constructed and are largely responsible for facial shape and variation. During early face development, neural crest cells produce ectomesenchyme-derived tissues, such as cartilage, bone, dermis, smooth muscle, adipocytes, and many others. The early face appears to be built from multiple spatially defined overlapping ectomesenchymal clones.
Cranial neural crest cells that give rise to mesenchymal derivatives in the head may undergo epithelial-to-mesenchymal transition (EMT) from a neural fold domain that might not express neural markers. EMT is a classical property of neural crest cells. During jaw development, neural crest cells first penetrate into the cephalic mesoderm, resulting in intermingling with mesodermal cells at early stages. Neural crest cells may provide the muscle connective tissue of muscles.
Repairing Atrophied Muscles: Strategies for Regaining Strength and Size
You may want to see also
Frequently asked questions
Facial muscles, also known as craniofacial muscles, are a group of about 20 flat skeletal muscles that lie underneath the skin of the face and scalp. They are essential for chewing and making facial expressions.
The facial muscles can be broadly categorized into three regions: the upper face, middle face, and lower face. The upper face includes muscles such as the procerus muscle, occipitofrontalis muscle, depressor supercilii muscle, and corrugator supercilii muscle. The middle face contains muscles involved in eye movements and blinking. The lower face includes the buccolabial group of muscles, which control the shape and movements of the mouth and lips.
The facial muscles are controlled by the facial nerve (Cranial Nerve VII), with each nerve serving one side of the face. These muscles contract to produce movements such as smiling, grinning, and frowning, allowing us to express emotions. Dysfunction of this nerve can lead to temporary or permanent muscle weakness and significantly impact an individual's quality of life.
