The buccinator is a thin quadrilateral muscle occupying the interval between the maxilla and the mandible at the side of the face. It forms the anterior part of the. The buccinator mechanism was investigated by injecting alginate into the buccal space of volunteers and examining the set shape, and by dissection of. (b) The buccinator mechanism during activity. The oral screen is placed predentally and stimulates the sensory input by touching the intra-oral membranes (V).
Same specimen, a slightly more inferior ventral region, showing multiple buccal salivary glands S interwoven with mecuanism bundles. This quadrilateral flat muscle is located deep to the skin and is mostly covered by the masseter and more superficial facial muscles. EMG during a continuous sequence of food gathering and mastication of pig chow Conclusions Buccinator contraction does thicken the cheek, and during mastication this activity takes place just as the closing stroke begins.
Cheek pressure and head posture. Masseter Temporalis sphenomandibularis Pterygoid lateral medial Fascia masseteric temporal. Because buccinator EMG was often irregular, correspondence between EMG and dimensional changes was poor during food gathering. The initial distance between the anterior and posterior crystals with the muscle at rest was 12—34 mm.
The shortening of the snout in higher primates has presumably brought about a greater functional continuity of these muscles, such that they work together as a total facial mask 3 to control ingested food. The single animal that drank during the daily sessions also drank during the final recording.
After about 20 days of fixation, the facial skin and subcutaneous fat were removed and the specimens embedded in paraffin wax. Buccinator activity is higher but less regular with apple, and the difference between working and buccinatkr activity is less clear.
The buccinator mechanism.
A tunnel from this incision to the molar region accessed the mandibular alveolar origin of the buccinator. Activity of peri-oral facial muscles and its coordination with jaw muscles during ingestive behavior in buuccinator rabbits.
The pressure transducer P was placed at the attachment of the buccinator to the mandibular alveolar process. A clinical and cephalometric study. However, there is little consideration of how this role is accomplished. Author manuscript; available in PMC Sep 1.
Pressure 0 to 40 kPaproduced using a blood pressure bulb, was plotted against voltage output. Pressure changes were not quantified for food gathering cycles, but, like dimensional changes, were clearly smaller than during mastication Fig. During food gathering, the buccinator muscle showed regular changes in dimension corresponding to the rapid movement cycles of the jaw Fig. Dimensional and pressure changes of the buccinator muscle during mastication a.
A major reason for the less regular pattern for non-pig chow foods was the presence of additional strong bursts of buccinator activity, often occurring as the jaw-closer burst was ending Fig.
Dissection was difficult, because fibers attached to the skin and blended with those of the orbicularis oris. Foods of different consistency were offered as during the previous recordings of normal mastication.
Sensory innervation is supplied by the buccal branch one of the muscular branches of the mandibular part of the trigeminal cranial nerve V. Synonymik der anatomischen Nomenclatur. Procedures were then repeated on the other buccintor. Sonometric distances were recorded digitally to a separate computer running SonoLab software Sonometrics.
Buccinator outlined in red. However, the relationship was not exact. After the mastication data were acquired about 30 minthe pigs were anesthetized again and placed prone on the table.
Dimensional changes were variable, probably because of distortions within the muscle. Concurrently, resting pressure at the mandibular attachment of the buccinator was higher in anesthetized animals, averaging 0. Drinking, as in other studies, 20 — 22 occurred by suction.
The jaw closers have minimal or no activity during drinking, while the orbicularis oris presents stronger activity than during mastication. Even with careful suturing, immobility was probably rarely achieved during mastication as the mandible opened and closed. The food preference for each pig varied, and no animal ate all the foods, except for pig chow. The independence of orbicularis oris and buccinator activity patterns further indicates that despite the apparent continuity of their fiber bundles at the oral commissure, these two muscles in pigs are neurologically distinct.
Genioglossus Hyoglossus chondroglossus Styloglossus Palatoglossus. Anatomical terms of muscle [ edit on Wikidata ]. EMG recording of the buccinator is challenging due to its proximity to other facial muscles, especially orbicularis oris, and the potential for crosstalk from the much larger masseter.
Buccinator muscle – Wikipedia
Roughly coincident with the maximum buccinator peak shaded regionspressure begins to rise, length decreases, and the muscle thickens. In pigs this timing corresponds with the initiation of jaw closure 25 and therefore suggests the buccinator is controlling the placement of the bolus on the occlusal table as the jaw closes, an interpretation also supported by videofluorographic studies of bolus position in humans. This is a PDF file of an unedited manuscript that has been accepted for publication.
As shown in Fig. When the pigs were chewing other foods orange slices, apples, almonds or pistachios with shellsthe buccinator EMG pattern was less clear and regular Figs.
Recordings were made five times per week bucclnator about 4 weeks for each animal. Strains were calculated from dimensional measurements as the peak change mechaniem cycle divided by the initial distance, i. Regardless of the detailed pattern of activity, these studies do support a role in mastication as a principal function of the buccinator.