Buccinator muscle

Muscle infobox
Name = Buccinator muscle
Latin = musculus buccinator
GraySubject = 108
GrayPage = 384


Caption = Buccinator outlined in red.


Caption2 =
Origin = from the alveolar processes of the maxillary bone and mandible, pterygomandibular raphe
Insertion = in the fibres of the orbicularis oris
Blood = buccal artery
Nerve = buccal branch of the facial nerve (VII cranial nerve)
Action = The buccinator compresses the cheeks against the teeth and is used in acts such as blowing. It is an assistant muscle of mastication (chewing).
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DorlandsPre = m_22
DorlandsSuf = 12548520
The buccinator is a thin quadrilateral muscle, occupying the interval between the maxilla and the mandible at the side of the face.

Action

Its action is to pull back the angle of the mouth and to flatten the cheek area.

Origin and insertion

It arises from the outer surfaces of the alveolar processes of the maxilla and mandible, corresponding to the three molar teeth; and behind, from the anterior border of the pterygomandibular raphé which separates it from the Constrictor pharyngis superior.

The fibers converge toward the angle of the mouth, where the central fibers intersect each other, those from below being continuous with the upper segment of the Orbicularis oris, and those from above with the lower segment; the upper and lower fibers are continued forward into the corresponding lip without decussation.

Innervation

Motor innervation is from the facial nerve (cranial nerve VII), and sensory innervation is from the buccal branch of the trigeminal nerve (cranial nerve V).

=Additional

External links

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