Buccinator muscle

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"Buccinator" redirects here. For other uses, see Buccinator (disambiguation).

Lua error in Module:Infobox at line 235: malformed pattern (missing ']'). 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]

Structure

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.

Origin: pterygomandibular raphe and surrounding bony structures. Insertion: modiolus.

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 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]

Function

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.

Structures piercing the buccinator

  1. Parotid duct (Stenson's duct)
  2. Molar glands of cheeks
  3. Buccal branch of mandibular nerve

Etymology

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'.


Additional images

  • Sobo 1909 263.png
  • Sobo 1909 262.png
  • Sobo 1909 264.png
  • Sobo 1909 266.png

  • 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

  • Gray1201.png

    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)

  • Slide1vv.JPG

    Buccinator muscle

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

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External links

  1. ↑ http://www.unifr.ch/ifaa/Public/EntryPage/TA98%20Tree/Entity%20TA98%20EN/04.1.03.036%20Entity%20TA98%20EN.htm
  2. ↑ OED 2nd edition, 1989.
  3. ↑ Entry "buccinator" in Merriam-Webster Online Dictionary.
  4. ↑ 4.0 4.1 Illustrated Anatomy of the Head and Neck, Fehrenbach and Herring, Elsevier, 2012, page 91
  5. ↑ Grant's Dissector, Fourteenth Edition, page 204
  6. ↑ 6.0 6.1 Foster, F.D. (1891–1893). An illustrated medical dictionary. Being a dictionary of the technical terms used by writers on medicine and the collateral sciences, in the Latin, English, French, and German languages. New York: D. Appleton and Company.
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Lewis, C.T. & Short, C. (1879). A Latin dictionary founded on Andrews' edition of Freund's Latin dictionary. Oxford: Clarendon Press.
  8. ↑ 8.0 8.1 8.2 Stieve, H. (1949). Nomina Anatomica. Zusammengestellt von der im Jahre 1923 gewählten Nomenklatur-Kommission, unter Berücksichtigung der Vorschläge der Mitglieder der Anatomischen Gesellschaft, der Anatomical Society of Great Britain and Ireland, sowie der American Association of Anatomists, überprüft und durch Beschluß der Anatomischen Gesellschaft auf der Tagung in Jena 1935 endgúltig angenommen. (4th edition). Jena: Verlag Gustav Fischer.
  9. ↑ 9.0 9.1 Schreger, C.H.Th.(1805). Synonymia anatomica. Synonymik der anatomischen Nomenclatur. Fürth: im Bureau für Literatur.
  10. ↑ Federative Committee on Anatomical Terminology (FCAT) (1998). Terminologia Anatomica. Stuttgart: Thieme
  11. ↑ International Anatomical Nomenclature Committee (1966). Nomina Anatomica. Amsterdam: Excerpta Medica Foundation.
  12. ↑ International Anatomical Nomenclature Committee (1977). Nomina Anatomica, together with Nomina Histologica and Nomina Embryologica. Amsterdam-Oxford: Excerpta Med
  13. ↑ International Anatomical Nomenclature Committee (1983). Nomina Anatomica, together with Nomina Histologica and Nomina Embryologica. Baltimore/London: Williams & Wilkins
  14. ↑ International Anatomical Nomenclature Committee (1989). Nomina Anatomica, together with Nomina Histologica and Nomina Embryologica. Edinburgh: Churchill Livingstone.
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