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Levator anguli oris

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Last Updated: 17 November 2020

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General | Latest Info

Levator anguli oris

Details
ActionsSmile ( elevates angle of mouth )
ArteryFacial artery
InsertionModiolus
NerveBuccal branches of the facial nerve
OriginMaxilla
Identifiers
FMA46822
LatinMusculus levator anguli oris or musculus caninus
TA22084
TA98A04.1.03.034

Levator anguli oris play a key role in nonverbal communication, as it helps faces form one of the most universally known expressions: smile. Muscle elevate angles of mouth at each corner. There are two levator anguli oris muscles, each located symmetrically on either side of the mouth. When two work in unison, corners of mouth move upwards. However, many other muscles of the face assist in smile, and each provide different level of nuance. Levator anguli oris arises from canine fossa, which is located under the infraorbital foramen, opening in bone just below the eye socket. Muscles fibers inserted at mouths angle, and they intermingle with zygomaticus, triangularis, and orbicularis oris muscles. Levator anguli oris also originates in the maxilla bone and is inserted into the modiolus, area in the corner of the mouth that contains eight different muscles. The muscle receives oxygenate blood from facial artery, while buccal branches of facial nerve provide sensory innervation.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Levator anguli oris muscle

Key facts about the levator anguli oris muscle

OriginCanine fossa of maxilla
InsertionModiolus
ActionElevates angle of mouth
InnervationZygomatic and buccal branches of facial nerve (CN VII)
Blood supplySuperior labial branch of facial artery, infraorbital branch of maxillary artery

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Origin and insertion

Key facts about depressor anguli oris muscle

OriginMental tubercle and oblique line of mandible (continuous with platysma muscle)
InsertionModiolus
FunctionDepresses angle of mouth
InnervationBuccal and mandibular branches of facial nerve (CN VII)
Blood supplyInferior labial artery (facial artery); mental artery (maxillary artery)

Levator anguli oris originates from canine fossa of maxilla, inferior to infraorbital foramen. After a short inferior course, it blends with modiolus at the angle of lips. A Modiolus is a fibromuscular nodule at the angle of the mouth formed by at least nine muscles. It serves as an attachment hub for most of buccolabial muscles, thus integrating movements of lips with those of the jaw and cheeks. Its exact characterization varies across different textbooks, but it sure that direct tractors of lips contribute to modiolus; zygomaticus major, depressor anguli oris and orbicularis oris.


Depressor anguli oris muscle

Depressor anguli oris muscle depressor anguli oris is a pair of triangular muscles that extend from the mental tubercle of the mandible to the angle of the mouth. It belongs to the buccolabial group of facial muscles along with levator labii superioris alaeque nasi, levator labii superioris, zygomaticus major, zygomaticus minor, levator anguli oris, risorius, depressor labii inferioris, mentalis, orbicularis oris, incisivus superior, incisivus inferior and buccinator muscles. The muscle is situated lateral to the chin on each side, extending almost vertically upwards. Along with other muscles that attach at the angle of mouth, depressor anguli oris forms a fibromuscular structure called modiolus. As its name suggest, it depresses the angle of the mouth and pulls it slightly laterally. Thereby, it facilitates expressing sadness and assists in opening mouth. This article will teach you all you need to know about the anatomy and functions of depressor anguli oris muscle.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

Key facts about the levator anguli oris muscle

OriginCanine fossa of maxilla
InsertionModiolus
ActionElevates angle of mouth
InnervationZygomatic and buccal branches of facial nerve (CN VII)
Blood supplySuperior labial branch of facial artery, infraorbital branch of maxillary artery
* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Location and Function

Key facts about depressor anguli oris muscle

OriginMental tubercle and oblique line of mandible (continuous with platysma muscle)
InsertionModiolus
FunctionDepresses angle of mouth
InnervationBuccal and mandibular branches of facial nerve (CN VII)
Blood supplyInferior labial artery (facial artery); mental artery (maxillary artery)

According to the Muscular System Manual, levator anguli oris originates from the maxilla, or upper jawbone, just above the canine tooth. It's located to the side of the nose and attaches to other muscle fibers at the outer angle of the mouth. When activated by buccal branch of facial nerve, levator anguli oris contracts, helping to raise the upper lip and pull it back slightly. This isolated movement exposes teeth and helps you create expressions of contempt and disdain. Most importantly, when muscle work together with other muscles of facial expression, such as zygomaticus muscles and risorius, it helps you form a smile.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Cosmetic Treatments

Plastic surgery procedures can alter the appearance of your smile if you so choose, and many involve facial muscles. One such procedure addresses a condition known AS gummy smile, which occurs when a significant amount of gum tissue becomes visible when a person smiles. Aesthetic issues can be treated through lip repositioning surgery, during which retraction ability of levator anguli muscle is limit, notes study in the Journal of Indian Society of Periodontology. Put simply, surgery restricts the muscle's ability to pull upper lip, thereby reducing the amount of gum tissue visible when a person smiles. Alternatively, Journal of Contemporary Dental Practice notes that botulinum toxin injections can also treat gummy smile, providing a more conservative approach than surgery. These injections work by temporarily preventing muscle movement so that the lip cannot be lifted far enough to display excessive gum tissue. These injections can also be paired with surgical techniques to make patients more satisfied with their smile.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Introduction

Muscle use in facial expression, primarily for smiling, levator anguli oris elevate angles of mouth. Levator anguli oris originates roughly 1 cm inferior to infraorbital foramen from canine fossa of maxilla and is located in the deepest layer of mimetic muscle. Levator anguli oris muscle falls in the hyoid muscle facial expressions category. These muscles are associated with skeletal elements that develop together with neural crest cells of branchial arch two. Blood supply to levator anguli oris comes from various small branches of labial, infraorbital, and facial arteries. Levator anguli oris receives innervation by terminal buccal branches of facial nerve.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Structure and Function

Key facts about depressor anguli oris muscle

OriginMental tubercle and oblique line of mandible (continuous with platysma muscle)
InsertionModiolus
FunctionDepresses angle of mouth
InnervationBuccal and mandibular branches of facial nerve (CN VII)
Blood supplyInferior labial artery (facial artery); mental artery (maxillary artery)

Levator anguli oris muscle levator anguli oris is a pair of strap-like muscles of the face, located above the angles of lips. It belongs to a large group of muscles of facial expression called the buccolabial group. Besides levator anguli oris, this group also contains levator labii superioris alaeque nasi, levator labii superioris, zygomaticus major, zygomaticus minor, risorius, depressor labii inferioris, depressor anguli oris, mentalis, orbicularis oris, incisivus superior and inferior, and buccinator muscles. Like all buccolabial muscles, levator anguli oris function contributes to producing facial expressions by controlling shape, position and movements of lips. Specifically, it does so by elevating the angle of mouth and deepening nasolabial lines, facilitating smiling. This article will discuss the anatomy and function of the levator anguli oris muscle.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

Key facts about the levator anguli oris muscle

OriginCanine fossa of maxilla
InsertionModiolus
ActionElevates angle of mouth
InnervationZygomatic and buccal branches of facial nerve (CN VII)
Blood supplySuperior labial branch of facial artery, infraorbital branch of maxillary artery
* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Embryology

Levator anguli oris is facial muscle used to elevate corners of the mouth. Zygomaticus major and levator anguli oris control elevation of commissure. The upper lip gets raised when levator labii superioris and zygomaticus minor are present. Vector of zygomaticus major orients in superolateral and posterior directions and thus, additional contraction of levator anguli oris results in alteration of the overall vector into more superior direction, which provides increased elevation of commissure than zygomaticus major alone. Levator anguli, locate along buccinator in the fourth and deepest layer of mimetic muscle, originate roughly 1 cm inferior to infraorbital foramen from canine fossa of maxilla. Its fibers travel in anteroinferior direction to insert into modiolus, allowing muscle fibers to combine with fibers of zygomaticus major, orbicularis oris, risorius, buccinator, and depressor anguli oris. As muscle fibers of levator anguli oris coalesce with zygomaticus major, they reach modiolus and form an average angle to one another of 37 degrees.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Blood Supply and Lymphatics

Key facts about depressor anguli oris muscle

OriginMental tubercle and oblique line of mandible (continuous with platysma muscle)
InsertionModiolus
FunctionDepresses angle of mouth
InnervationBuccal and mandibular branches of facial nerve (CN VII)
Blood supplyInferior labial artery (facial artery); mental artery (maxillary artery)

Branches of external carotid artery deliver blood supply to the majority of the face, while internal carotid artery contribute a smaller amount. The facial artery, main branch of the external carotid artery, originates in the carotid triangle of the neck. Various small branches of labial, infraorbital, and facial arteries supply blood to levator anguli oris. Aside from levator anguli oris muscle, labial artery give off septal branches to the nose and runs between the mucosa and orbicularis oris. Infraorbital artery run in infraorbital canal and leave through infraorbital foramen to reach face. Following Facial vein, lymph from medial canthus deposited into submandibular lymph nodes, but additionally into buccinator and parotid lymph nodes. Submental lymph nodes primarily drain perioral region. Venous drainage of the face mainly occurs through facial vein. This vein remains as major venous drainage of superficial areas of the face, receiving deep facial vein, which drain pterygoid venous plexus of infratemporal fossa, masseteric and parotid veins, and veins from inferior eyelid and lips.


Innervation

Motor innervation to perioral musculature uniformly is from the seventh cranial nerve. Facial nerve has temporal, zygomatic, buccal, marginal mandibular, and cervical branches. Buccal and marginal branches primarily supply innervation to perioral musculature. Interconnection between branches is common, with at least 4 connections form after exiting parotid gland. Fibers supply the majority of muscles of the face from their undersurface. Exceptions are 3 deepest perioral muscles, namely, buccinator, levator anguli oris, and mentalis. Skandalakis describes partial innervation of depressor muscles by anterior ramus of cervical branch in addition to primary marginal branch innervation. Dingman and Grabb report that in 100 dissections, mandibular branches were superior to mandibular border and anterior to facial artery. In contrast, Nelson and Gingrass find that multiple branches ascending from below the mandibular border provide frequent innervation to lip depressors. Nelson believes that any branch supplying lip depressors should be classified as a mandibular branch, as opposed to Skandalakis' classification.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Surgical Considerations

Key facts about depressor anguli oris muscle

OriginMental tubercle and oblique line of mandible (continuous with platysma muscle)
InsertionModiolus
FunctionDepresses angle of mouth
InnervationBuccal and mandibular branches of facial nerve (CN VII)
Blood supplyInferior labial artery (facial artery); mental artery (maxillary artery)

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

General information

Key facts about depressor anguli oris muscle

OriginMental tubercle and oblique line of mandible (continuous with platysma muscle)
InsertionModiolus
FunctionDepresses angle of mouth
InnervationBuccal and mandibular branches of facial nerve (CN VII)
Blood supplyInferior labial artery (facial artery); mental artery (maxillary artery)

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Sources

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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