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The human face has about 20 facial muscles that are essential for chewing and making facial expressions. One of these muscles is the orbicularis oris, a complex, multi-layered muscle that surrounds the mouth and forms the majority of the lips. This muscle is responsible for controlling the shape and movements of the lips, such as pursing, twisting, and pouting. It also plays a crucial role in speech and facial expressions, helping to produce sounds and express emotions.
| Characteristics | Values |
|---|---|
| Muscle Name | Orbicularis Oris |
| Muscle Type | Complex, multi-layered, circular muscle of facial expression |
| Muscle Function | Closes, protrudes, compresses, purses, twists, and pouts the lips |
| Muscle Group | Buccolabial group |
| Muscle Parts | Peripheral (extrinsic) and marginal |
| Muscle Attachments | Dermis of the upper and lower lips, buccinator, pharyngeal constrictor, and other facial muscles |
| Muscle Innervation | Facial nerve (CN VII) |
| Muscle Development | Present in human fetuses |
| Muscle Treatment | Botulinum toxin injections for smoker's lines |
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What You'll Learn
- The orbicularis oris muscle is responsible for pursed lips
- The muscle is a complex, multi-layered muscle
- It is made up of two parts: a larger peripheral part and a smaller marginal part
- The muscle is involved in the buccinator mechanism, which is important for orofacial functions
- Isolated contraction of the muscle causes movements like pursing, twisting, and pouting
The orbicularis oris muscle is responsible for pursed lips
The human face has about 20 facial muscles that are essential for chewing and making facial expressions. One of these muscles is the orbicularis oris muscle, also known as the orbicular muscle of the mouth. It is a complex, multi-layered circular muscle that surrounds the mouth and forms the majority of the lips. It is responsible for controlling the shape and movements of the lips.
The orbicularis oris muscle is composed of two parts: a larger peripheral part and a smaller marginal part. The peripheral portion, also called the extrinsic portion, originates from the modiolus, arising from the fibers of the five buccolabial muscles that attach to it. The marginal portions of the orbicularis oris muscle are also referred to as the labial cords, as they produce some consonantal (labial) sounds by changing their length and tension, similar to vocal cords.
The primary action of the orbicularis oris muscle is as a sphincter of the mouth, working in cooperation with the buccinator muscle and the tongue to prevent food from escaping the mouth during eating. Bilateral uniform contraction of the orbicularis oris brings the lips together and closes the mouth, while isolated contraction of respective parts of the muscle causes movements such as lip pouting, twisting, and pursing. These movements contribute to facial expressions and speech.
The orbicularis oris muscle is part of a functional unit known as the "buccinator mechanism," which includes the buccinator and pharyngeal constrictor muscles. This mechanism plays a crucial role in orofacial functions such as swallowing, sucking, whistling, chewing, vowel pronunciation, and kissing. If the orbicularis oris and buccinator muscles are weakened or paralyzed, food may accumulate in the oral vestibule during chewing.
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The muscle is a complex, multi-layered muscle
The human face has about 20 facial muscles that work together to enable functions such as chewing and making facial expressions. One of these muscles is the orbicularis oris muscle, which is responsible for pursed lips. Also known as musculus orbicularis oris, this is a complex, multi-layered muscle that attaches through a thin, superficial musculoaponeurotic system to the dermis of the upper and lower lips. The muscle may be regarded as a single muscle anatomically, but functionally it appears to consist of different parts that act either independently or together with other facial muscles.
The orbicularis oris muscle forms a functional unit with the buccinator and pharyngeal constrictor, known as the "buccinator mechanism". This mechanism plays a crucial role in orofacial functions such as swallowing, sucking, whistling, chewing, vowel pronunciation, and kissing. If the orbicularis oris and buccinator muscles are weakened or paralysed, food may accumulate in the oral vestibule during chewing.
The orbicularis oris muscle is a circular muscle that surrounds the mouth and forms the majority of the lips. It is part of a large group of muscles of facial expression called the buccolabial group, which also includes the levator anguli oris, levator labii superioris, and depressor labii inferioris, among others. The function of the orbicularis oris is to control the shape and movements of the lips, including closing, protruding, and compressing them.
The muscle consists of two parts: a larger peripheral part and a smaller marginal part. The peripheral portion, also called the extrinsic portion, originates from the modiolus, arising from the fibres of the buccolabial muscles that attach to it. The marginal portions of the orbicularis oris muscle are also referred to as the labial cords, as they can change their length and tension to produce certain consonantal (labial) sounds.
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It is made up of two parts: a larger peripheral part and a smaller marginal part
The human face has about 20 facial muscles that enable functions such as chewing and making facial expressions. One of these muscles is the orbicularis oris muscle, which is responsible for pursing the lips. This muscle is also known as the orbicular muscle of the mouth and is part of a large group of muscles of facial expression called the buccolabial group.
The orbicularis oris muscle is a complex, multi-layered muscle that attaches through a thin, superficial musculoaponeurotic system to the dermis of the upper and lower lips. It serves as an attachment site for many other facial muscles around the oral region. This muscle can be regarded as a single muscle anatomically, but functionally, it appears to consist of different parts that act either independently or together with other facial muscles.
The orbicularis oris muscle is made up of two parts: a larger peripheral part and a smaller marginal part. The border between these two portions corresponds to the margins of the lips that separate them from the surrounding skin. Both parts span between the left and right modiolus, which is a dense fibromuscular nodule at the angle of the mouth onto which most of the buccolabial muscles attach.
The peripheral portion, also called the extrinsic portion, originates from the modiolus, arising from the fibres of the five buccolabial muscles that attach to it. These are the levator anguli oris, depressor anguli oris, buccinator, risorius, and zygomaticus major muscles. However, most of the fibres that comprise the orbicularis oris originate from the buccinator muscle.
The marginal portions of the orbicularis oris muscle are also referred to as the labial cords, as by changing their length and tension similarly to vocal cords, they produce some consonantal (labial) sounds. These consonants include the /p/ of "peas" and the /b/ of "basket", which are produced by bringing the lips together.
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The muscle is involved in the buccinator mechanism, which is important for orofacial functions
The human face has about 20 facial muscles, which are essential for chewing and making facial expressions. One of these muscles is the orbicularis oris muscle, which is responsible for pursing the lips. This muscle is also known as the orbicular muscle of the mouth and is one of the facial muscles involved in the buccinator mechanism. The buccinator mechanism is a functional unit formed by the orbicularis oris muscle, the buccinator muscle, and the pharyngeal constrictor.
The orbicularis oris muscle is a complex, multi-layered muscle that attaches to the dermis of the upper and lower lip. It is unique in that it has neither a bony nor a tendinous origin. This muscle is involved in various orofacial functions, including swallowing, sucking, whistling, chewing, vowel pronunciation, and kissing. It works in cooperation with the buccinator muscle and the tongue to prevent food from escaping the mouth during eating.
The primary action of the orbicularis oris muscle is as a sphincter of the mouth, closing the lips and preventing food or other substances from entering or exiting the oral cavity. It also contributes to facial expressions and speech. Marginal portions of this muscle, also known as the labial cords, produce certain consonantal sounds by changing their length and tension, similar to vocal cords. For example, the /p/ sound in "peas" and the /b/ sound in "basket" are produced by bringing the lips together, while the /f/ sound in "feet" or the /v/ sound in "valley" are produced by pressing the lower lip against the upper teeth.
The proper functioning of the orbicularis oris muscle is crucial for normal orofacial functions. Any weakness or paralysis of this muscle, along with the buccinator muscle, can lead to food accumulation in the oral vestibule during chewing. In cleft lip cases, the proper orientation of this muscle is essential for its normal function, and reconstruction surgery aims to restore the anatomical and functional components of the upper lip, including the normal course of the orbicularis oris muscle.
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Isolated contraction of the muscle causes movements like pursing, twisting, and pouting
The human face is comprised of about 20 facial muscles, which are essential for chewing, making facial expressions, and performing other tasks. One of these muscles is the orbicularis oris, a circle of muscle around the mouth that closes or purses the lips when it contracts. This muscle is also responsible for various movements of the orofacial region and contributes to the contour of the lip region.
The orbicularis oris muscle is a complex, multi-layered muscle that attaches to the dermis of the upper and lower lips. It is composed of four independent quadrants that interlace and give the appearance of circularity. The muscle fibres run in different directions, rather than uniformly in a circular manner. The uppermost and lowermost fibres pass across the lips from side to side without decussation.
Isolated contraction of the orbicularis oris muscle causes movements like pursing, twisting, and pouting. This muscle is also involved in whistling, chewing, sucking, kissing, and playing brass and some woodwind instruments. If the orbicularis oris muscle is weakened or paralysed, food may accumulate in the oral vestibule during chewing.
The mentalis muscle, located towards the centre of the chin, also helps to control the lower lip. The platysma muscle, found in the neck, helps to open the mouth and allows the corners of the mouth and lower lip to be lowered. These muscles, along with the orbicularis oris, all play a role in enabling the complex movements involved in facial expressions.
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Frequently asked questions
The muscle that purses the lips is called the orbicularis oris muscle.
The orbicularis oris is a circular facial muscle that surrounds the mouth and forms the majority of the lips. It is one of about 20 facial muscles that are essential for chewing and making facial expressions.
The primary function of the orbicularis oris muscle is to act as the sphincter of the mouth, closing, protruding and compressing the lips. It also helps with speech and the production of facial expressions such as anger and sadness.
