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You are watching: Where is the buccinator muscle located

StatPearls . Sweetheart Island (FL): StatPearls Publishing; 2021 Jan-.


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Introduction

The Buccinator muscle is a bilateral square-shaped muscle constituting the mobile and the adaptable cheek area.<1> Couper and Myot coined the term buccinator in the year 1694.<2> This muscle is occasionally referred to together an accessory muscle of mastication due to its role in compressing the cheeks inwards versus molars, thus, aiding in chewing and also swallowing.<3> Due to its duty of puffing the end cheeks, the is likewise called “trumpeter muscle.” it lies deep to the skin. Superficial come this muscle lies the anterior border that the masseter muscle and more superficial face muscles.<4> One the the very first muscles in an child to get activated during sucking is the buccinator.


Structure and Function

The buccinator muscle theatre an active role along v orbicularis oris and superior constrictor muscle during swallowing, mastication, blowing, and also sucking.  It aids in mastication and also blowing by compressing the cheek inwards. There space theories that the muscle thickens the cheek mucosa acting together a muscular hydrostat.<5> Due come this thickening, the cheek pushes a food bolus in the direction of the tongue.<5>

Its contraction additionally pulls the corner of the mouth laterally.  While closing the mouth, the muscle contract gradually and during the opened movement, that relaxes; this maintains the forced tension the the cheeks, thereby avoiding injury of the buccal mucosa.<2><3>

It likewise helps in the retention and stabilization of the finish denture. Research additionally shows it come play a role in patients v a habit that thumb/finger sucking.<6>

There are different phases of swallowing. Buccinator often tends to act throughout two the the phases the swallowing. I.e. Oral and also pharyngeal phase. Buccinator, along with the orbicularis oris muscle starts the swallowing activity in the dental phase by generating a peristaltic wave-like contraction.<7> This wave passes v the pharynx. The tide gets initiated through the buccinator muscle and also is adhered to by the orbicularis oris muscle quickly.<7>

Apart from this, the buccinator muscle it s okay activated throughout some mandibular motions like protrusion and retrusion. This activation go not reason the activities directly yet aids in the expression of an effort to do them.<8>

Also, there room reports that some tiny fibers originate from this muscle and insert right into the parotid duct (distal portion). This fibers pat an active function in regulating the physiological cheap of saliva native the parotid duct.<9>


Embryology

The muscle derives native the second pharyngeal arch or the hyoid arch. It starts to develop along with other face muscles between 3 and 8 weeks indigenous the laminae formed on each side that the face from pre-myeloblasts and also myeloblasts. Over there are five laminae developed out of which the mandibular lamina creates the buccinator.<10>


Blood Supply and also Lymphatics

The main blood it is provided to the buccinator originates from three arteries which type extensive anastomotic vascular plexus ~ above the muscle"s lateral surface and also within that fibers. The posterior component of the muscle is supplied by the buccal artery, i beg your pardon is a branch that the maxillary artery. The artery runs in an anteroinferior direction either superficial or deep to the lateral pterygoid muscle to with the posterior part of the muscle. The facial artery, via its many branches, offers the posterior, inferior, and anterior components of the muscle. The posterior buccal branch, which is the biggest branch that the facial artery provides the posterior fifty percent of the muscle. Worse buccal branches the the face artery supply the inferior half of the muscle. It then runs anterosuperiorly to give off anterior buccal branches which it is provided the anterior fifty percent of the muscle. Two tiny branches type the posterosuperior alveolar artery, i beg your pardon is a branch that the maxillary artery that enters the buccinator muscle posterosuperiorly and supply the bordering area.

Venous drainage the the muscle occurs through the pterygoid plexus and also internal maxillary vein.


Nerves

The muscle has both motor and also sensory innervations.  Sensory innervation is by the long buccal nerve, which is a branch that the maxillary department of the 5th cranial nerve. Motor innervation of the muscle is via the temporal and cervical divisions of the saturday cranial nerve (facial nerve).<11>


Muscles

The fibers of the buccinator muscle have their origin from three areas due to which this muscle has actually three muscular bundles.<2> Two that the muscular bundles have actually a bony origin. The maxillary bundle occurs from the buccal part of the alveolar process of the maxilla, the mandibular bundle occurs from the buccal portion of the alveolar process of the mandible, and the longitudinal bundle arises from the pterygomandibular raphe.<1> Raphe connects the posterior fibers of this muscle through the anterior part of a pharyngeal muscle, i.e., premium constrictor muscle.<1> The yarn of every the 3 bundles operation in the anterior direction and also descent with the modiolus thus, creating the musculature that the cheek.<3> They insert and blend v fibers of the orbicularis oris muscle. Yarn of the maxillary bundle blend with fibers that the orbicularis oris muscle at the mandibular lip, fibers of the mandibular bundle operation upward at the maxillary lip, and also fibers the the longitudinal bundle at the dental commissure to insert right into the upper and lower lip.<12>  

On the lateral aspect, this muscle is related to the ramus that the mandible, muscle of mastication (masseter and medial pterygoid muscle), the buccal fat pad, and the buccopharyngeal fascia. ~ above the medial aspect, its spanning is the submucosa and mucosa of the cheek.

The buccinator muscle is pierced by the parotid duct (Stenson"s duct) after it crosses the masseter muscle and also turns medially at the anterior border the the muscle to open up in the oral cavity into a small papilla opposite the maxillary 2nd molar.


Physiologic Variants

The crestal attachment of the buccinator muscle, although a rare phenomenon, might lead to difficulty in routine dental functions and also restoring the edentulous area. 


Surgical Considerations

As the parotid duct pierces the buccinator muscle, it must be identified and also preserved throughout surgery such as while increasing the buccinator flap. Tiny to moderate-sized defects the the dental cavity can have reconstruction with the buccinator flap, i beg your pardon is easy and also quick to raise. The replaces mucosa with mucosa and also correlates with a an extremely low level of morbidity that the donor site. That is substantial elastic, thus can be stretched quickly to conform come defects with a complicated shape.


Clinical Significance

Hyperactivity the the buccinators muscle can reason excessive push on the underlying tough tissues leading to narrow arches and also malocclusion.<13><14>

Damage come the facial nerve deserve to lead to paralysis the the buccinator muscles, which can lead to an overwhelming mastication as the non-functioning of this muscle can reason repeated laceration of the cheek mucosa.

Abnormal attachments of this muscle may interfere through the ideal prosthodontic management and also in maintaining oral hygiene. It will likewise restrict the cheek and lip movement leading to challenge in mastication and phonation.

The muscle has been presented to have an indirect involvement during parafunctional movements.

Clinical implicitly in Prosthodontics

In the dental cavity, inward pressures by the orbicularis oris and the buccinator muscle get well balanced by the outward pressures of the tongue. When making an impression because that a totally edentulous patient, molding must be excellent by muscle role in such a manner the it is in harmony with the bordering musculature.

Buccinator along with orbicularis oris and also pharyngeal constrictor forms a practical unit (buccinator mechanism) i beg your pardon is important for orofacial features (swallowing, sucking, whistling, chewing, vowel pronunciation). If the buccinator is dilute or paralyzed, food has tendency to accumulate in the vestibule throughout chewing.

Buccinator muscle plays a duty in stabilizing the denture through gripping the refined surface of the denture. Also, the longitudinal fibers organize the bolus of food in between the teeth throughout mastication. The maxillary bundle of this muscle often tends to raise the upper denture, vice versa, the mandibular bundle of this muscle depresses the reduced denture, thus aiding in denture stability and also retention.

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Other Issues

The fascial spaces confine beforehand infection, but because the spaces connect with every other, as the infection progresses, the inflammation have the right to involve the various other spaces. The buccal space is the fascial space minimal superomedially and also inferomedially by yarn of the buccinator muscle originating native alveolar processes of the maxilla and mandible. Thus, the roots of the posterior teeth are concerned this space. Any type of infection in the parotid may extend to the buccal an are and vice versa.<15>