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The caninus muscle, also known as the levator anguli oris, is a facial muscle of the mouth. It arises from the canine fossa, immediately below the infraorbital foramen, and its fibres are inserted into the angle of the mouth, causing it to elevate. The caninus muscle is innervated by the buccal branches of the facial nerve.
| Characteristics | Values |
|---|---|
| Type | Facial muscle of the mouth |
| Other names | Musculus caninus, musculus levator anguli oris, musculus triangularis labii superioris, levator anguli oris |
| Origin | Canine fossa of maxilla |
| Insertion | Orbicularis oris and skin at angle of mouth |
| Action | Raises angle of mouth |
| Nerve supply | Facial |
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What You'll Learn
Caninus is a facial muscle of the mouth
The caninus muscle, or musculus caninus, is a facial muscle of the mouth. It is also known as the levator anguli oris. This muscle arises from the canine fossa, immediately below the infraorbital foramen, and its fibers are inserted into the angle of the mouth. The caninus muscle is innervated by the buccal branches of the facial nerve. Its action is to raise the angle of the mouth, and it is supplied by the facial nerve.
The caninus muscle is one of the muscles of facial expression. These muscles are responsible for producing facial expressions such as smiling, frowning, and raising the eyebrows. They are also involved in functions such as sucking, chewing, and speaking. The facial muscles are supplied by the facial nerve, also known as the seventh cranial nerve.
The caninus muscle is a thin, flat muscle that is located in the upper lip. It originates from the canine fossa of the maxilla and inserts into the orbicularis oris muscle and the skin at the angle of the mouth. The orbicularis oris is a circular muscle that surrounds the mouth and is involved in functions such as smiling, frowning, and pursing the lips.
The caninus muscle works in conjunction with other facial muscles to produce a range of facial expressions. When the caninus muscle contracts, it pulls on the angle of the mouth, raising it slightly. This action can be observed when a person smiles or laughs. The caninus muscle also helps to maintain the shape and position of the upper lip.
In summary, the caninus muscle is a facial muscle of the mouth that plays an important role in facial expressions and oral functions. It originates in the upper jaw and inserts into the muscles and skin around the mouth, allowing for a range of movements and expressions.
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It arises from the canine fossa
The caninus muscle is a facial muscle of the mouth. Specifically, the caninus muscle arises from the canine fossa, which is a hollow or depression in the facial surface just below the infraorbital foramen. This is where the zygomatic, frontal, and alveolar processes of the maxilla come together. The canine fossa is lateral to the incisive fossa of the maxilla and is larger and deeper than the comparable incisive fossa. It is separated from the incisive fossa by a vertical ridge, the canine eminence, which corresponds to the socket of the canine tooth.
The mesial crown surface of the first premolar has a concavity that extends into the root trunk surface, which is referred to as the canine fossa. The mesial crown surface of the second premolar is convex. The maxillary nerve opens out into terminal branches (the "bouquet") on a plane overlying that of the canine muscle.
In terms of its musculoskeletal anatomy, the canine fossa is a depression external to and somewhat above the prominence on the surface of the superior maxillary bone. This prominence is caused by the socket of the canine tooth. The facial part of the skull of the lesser apes is comparatively small, and the overall shape of the skull is dominated by the large braincase.
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The muscle is inserted into the angle of the mouth
The caninus muscle, also known as the levator anguli oris, is a facial muscle of the mouth. Originating from the canine fossa, immediately below the infraorbital foramen, the muscle fibres are inserted into the angle of the mouth. This insertion allows the caninus muscle to intermingle with other muscles, such as the zygomaticus, triangularis, and orbicularis oris.
The specific function of the caninus muscle is to elevate the angle of the mouth medially, contributing to facial expressions and movements. This action is made possible by the insertion of the muscle fibres into the angle of the mouth, providing the necessary leverage for elevation.
The caninus muscle is innervated by the buccal branches of the facial nerve, ensuring its ability to contract and relax in a coordinated manner. This nerve supply, known as the facial nerve, plays a crucial role in the muscle's function and overall facial movement.
The insertion of the caninus muscle into the angle of the mouth is a precise and intricate aspect of facial anatomy. This insertion point allows for the muscle's fibres to interact with surrounding tissues and muscles, enabling a range of facial expressions and movements associated with the mouth.
Understanding the structure and function of the caninus muscle is particularly relevant in the field of dental professions. Its role in elevating the angle of the mouth can impact dental health and facial aesthetics. Additionally, knowledge of this muscle's anatomy is essential for medical professionals performing procedures or addressing conditions related to the facial region.
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Caninus is innervated by the buccal branches of the facial nerve
The caninus muscle, also known as the levator anguli oris, is a facial muscle of the mouth. It arises from the canine fossa, immediately below the infraorbital foramen, and its fibres are inserted into the angle of the mouth. Specifically, the caninus muscle is innervated by the buccal branches of the facial nerve. This means that the nerve supply for the caninus muscle comes from the buccal branches of the facial nerve.
The caninus muscle is responsible for raising the angle of the mouth. It helps to form the upper lip and is inserted into the orbicularis oris, with its fibres intermingling with those of other muscles such as the zygomaticus, triangularis, and orbicularis oris. The orbicularis oris is a circular muscle that surrounds the mouth and controls the movement of the lips, including the action of pursing the lips together.
The buccal branches of the facial nerve, which innervate the caninus muscle, originate from the facial nerve (CN VII). This nerve is a cranial nerve that arises from the brainstem and has multiple functions, including controlling the muscles of facial expression and providing sensory information from the skin of the face.
The facial nerve is a crucial component of the facial expression system, enabling individuals to convey a wide range of emotions and social signals through facial movements. Damage to the facial nerve can result in facial paralysis or weakness, impacting an individual's ability to smile, frown, or make other facial expressions.
Understanding the innervation of the caninus muscle is important in dentistry and maxillofacial surgery, as it plays a role in the aesthetics and functionality of the mouth and upper lip. Knowledge of the buccal branches of the facial nerve is also essential for surgical procedures in this region, ensuring that interventions do not compromise nerve function and preserving the patient's ability to express emotion through facial movements.
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It is also known as levator anguli oris
The caninus muscle, also known as the levator anguli oris, is a facial muscle of the mouth. It is a paired strap-like muscle, located above the angles of the lips. It belongs to a large group of muscles of facial expression called the buccolabial group. The levator anguli oris muscle works alongside the buccolabial muscles to control the shape, position and movement of the lips. Specifically, it elevates the angle of the mouth and deepens the nasolabial lines, facilitating smiling.
The LAO muscle fibres form an angle of approximately 37 degrees with those of the more lateral zygomaticus major muscle. The LAO works with the zygomaticus major and minor, levator labii superioris, and levator labii superioris alaeque nasi to provide upper dental show when smiling and maintain the upper lip's resting tone and position. The LAO is not the most critical of the smile muscles, but unilateral LAO paralysis can lead to noticeable smile asymmetry, impacting a person's quality of life.
The LAO is also crucial in maintaining the oral commissure's resting position, and has been proposed as a target for midfacial rejuvenation procedures, such as plication via an intraoral incision to elevate the corner of the mouth. This technique may also be valuable in flaccid facial paralysis management. The LAO is a component of interest during lip repositioning or reconstructive surgeries, particularly those involving the upper lip and facial nerve, due to its role in proper speech and mastication, as well as facial aesthetics.
The modiolus is a fibromuscular structure in the oral commissure lateral to the orbicularis oris at the corner of the mouth. The LAO's fibres travel anteroinferiorly and insert into the modiolus. The levator anguli oris originates from the canine fossa of maxilla, inferior to the infraorbital foramen. After a short inferior course, it blends with the modiolus at the angle of the lips.
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Frequently asked questions
The caninus muscle, also known as the levator anguli oris, is a facial muscle of the mouth.
The caninus muscle is a facial muscle of the upper lip, originating from the canine fossa of the maxilla.
The caninus muscle raises the angle of the mouth. It is innervated by the buccal branches of the facial nerve.
Yes, "caninus muscles" is the plural form, indicating that there can be more than one caninus muscle in the body.
