Maximus Gage
The human face has about 20 facial muscles that allow us to make facial expressions and perform tasks such as chewing. 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. Facial muscles can be categorised into three groups: orbital, nasal, and oral. The orbital muscles control the movement of the eyelids, the nasal muscles are associated with movements of the nose and the skin surrounding it, and the oral muscles are responsible for the movements of the mouth and lips.
| Characteristics | Values |
|---|---|
| Number of facial muscles | 20 |
| Location | Underneath the skin of the face, from the scalp to the neck |
| Functions | Chewing, making facial expressions, singing, whistling, raising eyebrows, smiling, frowning, grimacing, etc. |
| Groups | Orbital, nasal, oral, auricular, buccolabial |
| Orbital muscles | Orbicularis oculi, palpebral, lacrimal, orbital |
| Nasal muscles | Nasalis, procerus |
| Oral muscles | Orbicularis oris, buccinator |
| Auricular muscles | Superior, posterior, anterior auricular |
| Buccolabial muscles | Buccinator, depressor anguli oris, depressor labii inferioris, levator anguli oris, levator labii superioris, levator labii superioris alaeque nasi, mentalis, risorius, zygomaticus major, zygomaticus minor |
Explore related products
What You'll Learn
- Orbital muscles control the eyelids and protect the cornea
- Nasal muscles are involved in creating facial expressions and respiration
- Oral muscles control the movements of the mouth and lips
- Auricular muscles are around the ears and allow some people to move them
- Buccolabial muscles are in and around the mouth, controlling its shape and movement
Orbital muscles control the eyelids and protect the cornea
The human face has about 20 facial muscles that enable functions such as chewing and making facial expressions. These muscles are located throughout the face, including the ears, mouth, forehead, nose, and eyes. The facial muscles can be broadly categorized into three groups: orbital, nasal, and oral. Orbital muscles, also known as the muscles of facial expression, are associated with the eye socket and are responsible for controlling the eyelids and protecting the cornea.
The orbital group of facial muscles contains two muscles: the orbicularis oculi and the levator palpebrae superioris. The orbicularis oculi muscle is a flat, broad muscle that forms an ellipse around the circumference of the orbit. It is composed of three parts: the orbital part, the palpebral part, and the deep palpebral part (also known as the lacrimal part). The orbital part overlays the orbital rim and originates from the nasal part of the frontal bone, the frontal process of the maxilla, and the medial palpebral ligament. The upper fibers of the orbital part merge with the occipitofrontalis, corrugator supercilii, and depressor supercilii muscles, finally inserting into the skin and subcutaneous tissue of the eyebrow. The palpebral part originates from the superficial surface of the medial palpebral ligament, and its muscle fibers compose the eyelids as they travel toward the lateral commissure of the eye. The deep palpebral part originates from the lateral surface and lacrimal crest (superior part) of the lacrimal bone, and its fibers pass laterally, inserting into the superior and inferior tarsi of the eyelids.
The contraction of the palpebral part of the orbicularis oculi muscle results in finer control of the eyelids. These muscle fibers pull the upper eyelids down and raise the lower ones, allowing for blinking, sleeping, and non-verbal communication. Additionally, the contraction of the deep palpebral part aids in tear drainage across the cornea by pulling the eyelids and lacrimal papillae medially and dilating the lacrimal sac.
The levator palpebrae superiori muscle is an extraocular eye muscle that is specifically responsible for elevating the upper eyelid. It is innervated by the oculomotor nerve (CN III). Paralysis of this muscle leads to a condition known as ptosis, characterized by the inability to elevate the upper eyelid.
In summary, the orbital muscles, particularly the orbicularis oculi and levator palpebrae superioris, play a crucial role in controlling the eyelids and protecting the cornea through functions such as blinking, tear drainage, and eyelid elevation.
Muscle Mechanics: Unraveling the Intricacies of Word Roots
You may want to see also
Explore related products
Nasal muscles are involved in creating facial expressions and respiration
The human face has about 20 facial muscles that are essential for chewing and making facial expressions. These 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 on the left side of the face and one on the right.
The facial muscles can be broadly categorized into three groups: orbital, nasal, and oral. The nasal group of facial muscles, which includes the nasalis and procerus muscles, is primarily involved in creating facial expressions and contributing to respiration. The nasalis muscle, which is the largest of the nasal muscles, is responsible for compressing the nasal aperture with its transverse part and dilating the nostrils with its alar part. These actions are important in creating facial expressions, such as conveying feelings of anger, and enhancing deep breathing. The alar part of the nasalis originates from the maxilla overlying the lateral incisor and attaches to the alar cartilage of the nasal skeleton. The transverse part originates from the maxilla, immediately lateral to the nose, and attaches onto an aponeurosis across the dorsum of the nose.
The procerus muscle, on the other hand, is the most superior of the nasal muscles. It lies superficially to the other muscles of facial expression. The procerus originates from the nasal bone and inserts onto the skin of the lower medial forehead. It acts to pull the eyebrows downward, producing transverse wrinkles over the nose, which is associated with frowning.
In addition to the nasal muscles, the oral muscles of facial expression are responsible for the movements of the mouth and lips. These muscles are required for singing, whistling, and adding emphasis to vocal communication. The group includes the orbicularis oris, buccinator, and various smaller muscles. The orbicularis oris is the main sphincter muscle of the lips, responsible for closing the lips to narrow the oral opening. The buccinator is a thin, square-shaped muscle located between the mandible and maxilla. It assists in compressing the cheek.
The facial muscles involved in chewing, or muscles of mastication, include the lateral pterygoid and masseter. The lateral pterygoid is a fan-shaped muscle that helps the jaw open, while the masseter runs from the cheek to the side of the jaw and aids in closing the jaw.
The Muscular Might of Supergirl
You may want to see also
Explore related products
Oral muscles control the movements of the mouth and lips
The human face has about 20 facial muscles that enable essential tasks such as chewing and making facial expressions. These muscles are located throughout the face, including the ears, mouth, forehead, nose, and eyes.
The oral muscles, specifically, are responsible for the movements of the mouth and lips. They are also required in singing and whistling and add emphasis to vocal communication. The oral muscles can be further divided into upper and lower groups.
The upper group contains the risorius, zygomaticus major, zygomaticus minor, levator labii superioris, levator labii superioris alaeque nasi, and levator anguli oris. The risorius is a highly variable and inconsistent muscle of the buccolabial group. The levator labii superioris is a short triangular muscle that originates from the zygomatic process of the maxilla and maxillary process of the zygomatic bone. It courses downwards and medially to attach to the skin and submucosa of the upper lip, blending with other facial muscles that insert at this site. The levator labii superioris is innervated by the zygomatic and buccal branches of the facial nerve. The zygomaticus minor acts in harmony with other tractors of the upper lip to elevate and evert the upper lip, contributing to a variety of facial expressions such as smiling, frowning, or grimacing.
The lower group contains the depressor anguli oris, depressor labii inferioris, and mentalis. The mentalis is a short conical muscle located in the chin area. It arises from the incisive fossa of the mandible and descends inferiorly to insert onto the skin of the chin at the level of the mentolabial sulcus of the mandible. The mentalis muscle acts to depress and evert 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 oris is the main sphincter muscle of the lips. It arises from the maxilla and from the other muscles of the cheek, inserting onto the skin and mucous membrane of the lips. The function of the orbicularis oris is to produce movements of the lips, such as lip pouting, puckering, and twisting. The buccinator is a thin, square-shaped muscle located between the mandible and maxilla, deep to the other muscles of the face. Its function is to compress the cheek against the molar teeth and prevent them from getting bitten during mastication. It also contributes to keeping the bolus of food central in the oral cavity and preventing it from escaping into the oral vestibule.
Deep Muscle Massage: Benefits and Techniques
You may want to see also
Explore related products
Auricular muscles are around the ears and allow some people to move them
The human face has about 20 facial muscles, which are essential for chewing and making facial expressions. These muscles are located throughout the face, including the ears, mouth, forehead, nose, and eyes. They are typically paired, with one on the left side of the face and one on the right.
The auricular muscles are a group of muscles located around the ears. They consist of two sets: the extrinsic and the intrinsic. The extrinsic muscles connect the auricle (or pinna, the shell of the ear) to the skull and scalp and move the auricle as a whole. The intrinsic muscles extend from one part of the auricle to another. The extrinsic muscles are the anterior, superior, and posterior auricular muscles. The anterior auricular muscle, the smallest of the three, pulls the ear forward. The superior auricular muscle, the largest of the three, raises the ear. The posterior auricular muscle moves the ear backward.
While voluntary ear movement is rare, some people can move their ears due to unique neurological pathways. These auricular muscles were once essential for our primate ancestors, helping them to funnel sound and improve their hearing. Today, these muscles are considered vestigial in humans, meaning they have lost much of their original function through evolution. However, recent studies have found that the auricular muscles are activated when people listen intently, particularly in challenging auditory environments with competing sounds. This suggests that these muscles may be engaged as part of an attentional effort mechanism.
The facial muscles can be broadly categorized into three groups: orbital, nasal, and oral. The orbital group contains two muscles associated with the eye socket and is the only muscle that can close the eyelids. The nasal group is associated with movements of the nose and the surrounding skin, and the muscles in this group are primarily involved in creating facial expressions and contributing to respiration. The oral group is responsible for the movements of the mouth and lips and is required for singing, whistling, and adding emphasis to vocal communication.
Fasting: Muscle Recovery Friend or Foe?
You may want to see also
Explore related products
$19.98
Buccolabial muscles are in and around the mouth, controlling its shape and movement
The human face has about 20 facial muscles that enable functions such as chewing and making facial expressions. These muscles are located throughout the face, including the ears, mouth, forehead, nose, and eyes.
The buccolabial muscles are a subgroup of the facial muscles that are in and around the mouth, controlling its shape and movement. The word "buccolabial" is derived from two Latin roots: "bucca," meaning cheek, and "labial," the lips of the mouth. These muscles consist of a sphincter muscle (orbicularis oris), the buccinators, and a set of muscles that elevate, depress, and retract the upper and lower lips and corners of the mouth. There are 11 of these muscles, and their functions include:
- Elevating and everting the upper lip: levator labii superioris, levator labii superioris alaeque nasi, risorius, levator anguli oris, zygomaticus major, and zygomaticus minor muscles.
- Depressing and everting the lower lip: depressor labii inferioris, depressor anguli oris, and mentalis muscles.
- Closing the lips: orbicularis oris muscle.
- Compressing the cheek: buccinator muscle.
The buccinator muscle is a thin, square-shaped muscle located between the mandible and maxilla, deep within the other muscles of the face. The orbicularis oris is the main sphincter muscle of the lips, arising from the maxilla and other muscles of the cheek. The levator labii superioris is a short triangular muscle that originates from the zygomatic process of the maxilla and maxillary process of the zygomatic bone. It assists other buccolabial muscles in elevating and everting 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 contempt. The risorius is a highly variable and inconsistent muscle of the buccolabial group, deemed the "smiling muscle" due to its function of pulling the angles of the mouth to produce a smile. The levator anguli oris is a slender, sheet-like muscle that helps to produce a smile.
Muscle Tone and Genes: What's the Link?
You may want to see also
Frequently asked questions
The muscles of facial expression are located within the subcutaneous tissue of the face. They originate from bone or fascia and insert into the skin. There are about 20 of them on each side of the face, and they are responsible for making facial expressions and chewing.
The facial expression muscles can be divided into three groups: orbital, nasal, and oral. The orbital muscles control the movement of the eyelids and include the orbicularis oculi, which has three parts: palpebral, lacrimal, and orbital. The nasal group includes the nasalis and procerus muscles, which are involved in creating facial expressions and respiration. The oral muscles control the movements of the mouth and lips and include the orbicularis oris and buccinator.
Some examples of facial expression muscles include the mentalis, which is a chin muscle that controls the movement of the lower lip and creates wrinkles on the skin of the chin; the risorius, which is part of the buccolabial group; and the zygomaticus minor, which elevates and everts the upper lip, contributing to expressions such as smiling and frowning.
