Everything about Buccinator Muscle totally explained
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
Image:Illu head neck muscle.jpg|Muscles of head and neck
Image:Gray157.png|Left maxilla. Outer surface.
Image:Gray176.png|Mandible. Outer surface. Side view.
Image:Gray381.png|Scheme showing arrangement of fibers of Orbicularis oris.
Image:Gray513.png|The internal carotid and vertebral arteries. Right side.
Image:Gray778.png|Distribution of the maxillary and mandibular nerves, and the submaxillary ganglion.
Image:Gray781.png|Mandibular division of the trifacial nerve.
Image:Gray1201.png|The mouth cavity. The cheeks have been slit transversely and the tongue pulled forward.
Further Information
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