出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/06/18 05:57:15」(JST)
| Buccinator muscle | |
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Buccinator outlined in red.
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| Details | |
| Latin | Musculus buccinator[1] |
| Origin | from the alveolar processes of the maxillary bone and mandible, temporomandibular joint |
| Insertion | in the fibers of the orbicularis oris |
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Artery
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buccal artery |
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Nerve
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buccal branch of the facial nerve (VII cranial nerve) |
| Actions | The buccinator compresses the cheeks against the teeth and is used in acts such as blowing. It is an assistant muscle of mastication (chewing) and in neonates it is used to suckle. |
| Identifiers | |
| Gray's | p.384 |
| Dorlands /Elsevier |
m_22/12548520 |
| TA | A04.1.03.036 |
| FMA | 46834 |
| Anatomical terms of muscle | |
The buccinator (/ˈbʌksɪneɪtər/[2][3] ) 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 cheek or the lateral wall of the oral cavity.[4]
It arises from the outer surfaces of the alveolar processes of the maxilla and mandible, corresponding to the three pairs of 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.
Motor innervation is from the buccal branch of the facial nerve (cranial nerve VII). Sensory innervation is supplied by the buccal branch (one of the muscular branches) of the mandibular part of the trigeminal (cranial nerve V).[5]
Its purpose is to pull back the angle of the mouth and to flatten the cheek area, which aids in holding the cheek to the teeth during chewing. This action causes the muscle to keep food pushed back on the occlusal surface of the posterior teeth, as when a person chews. By keeping the food in the correct position when chewing, the buccinator assists the muscles of mastication.[4]
It aids whistling and smiling, and in neonates it is used to suckle.
In the past the buccinator muscle was also written as bucinator muscle.[6] A bucinator in classical Latin is a trumpeter,[7] or more precisely, the person who blows the bucina.[7] The name bucina could refer in Roman antiquity to a crooked horn or trumpet,[7] a shepherd's horn[7] or a war-trumpet.[7] Despite its similarity to the classical Latin name for cheek, i.e. bucca,[7] the words bucinator, bucina, and bucinere (to blow the bucina[7]) are not related to bucca,[8] hence some disapproved buccinator[8] Although the name bucinator is not derived from bucca, this muscle is also called musculus buccae [9] or musculus buccalis [6] in Latin and muscle of the cheek [9] in English.
The most recent official Latin anatomic nomenclature (Terminologia Anatomica),[10] and preceding editions (Nomina Anatomica)[11][12] [13][14] dictate the spelling 'musculus buccinator' with double 'c', with the exception of the Jena Nomina Anatomica, authorized in 1935, which writes 'musculus bucinatorius' [8] with a single 'c'.
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.
Position of buccinator muscle (red)
Position of buccinator muscle (red)
Position of buccinator muscle (red)
Buccinator muscle
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
| Wikimedia Commons has media related to Buccinator muscles. |
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