Buccinator muscle

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Buccinator muscle
Image:Buccinator.jpg
Buccinator outlined in red.
Latin	musculus buccinator
Gray's	subject #108 384
Origin:	from the alveolar processes of the maxillary bone and mandible, pterygomandibular raphe
Insertion:	in the fibres of the orbicularis oris
Artery:	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).
Dorlands/Elsevier	m_22/12548520

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 images

Muscles of head and neck	Left maxilla. Outer surface.	Mandible. Outer surface. Side view.	Scheme showing arrangement of fibers of Orbicularis oris.
The internal carotid and vertebral arteries. Right side.	Distribution of the maxillary and mandibular nerves, and the submaxillary ganglion.	Mandibular division of the trifacial nerve.	The mouth cavity. The cheeks have been slit transversely and the tongue pulled forward.

External links

-845545395 at GPnotebook
LUC buc
Buccinator+muscle at eMedicine Dictionary
Roche Lexicon - illustrated navigator, at Elsevier 05287.011-1
Roche Lexicon - illustrated navigator, at Elsevier 25420.000-1

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.