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maxillofacial neoplasms. However, no other signs are present except those involved in changes in occlusion intraorally such as pain, and the enlargement corresponds with the outline of the muscle. Most patients seek medical attention because of comments about facial appearance, and this situation may be associated with further pathology of the
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The coronoid head of the masseter's tendon and muscle fibers run posterolaterally from the coronoid process of the mandible towards the posterior third of the zygomatic arch. Its function is believed to be the retraction of the mandible and the stabilization of the mandibular coronoid process.
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is asymptomatic and soft; it is usually bilateral but can be unilateral. Even if the hypertrophy is bilateral, asymmetry of the face may still occur due to unequal enlargement of the muscles. This extraoral enlargement may be confused with parotid salivary gland disease, dental infections, and
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The deep head is much smaller, and more muscular in texture. It arises from the posterior third of the lower border and from the whole of the medial surface of the zygomatic arch. Its fibers pass downward and forward, to be inserted into the upper half of the ramus as high as the
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The action of the muscle during bilateral contraction of the entire muscle is to elevate the mandible, raising the lower jaw. Elevation of the mandible occurs during the closing of the jaws. The masseter parallels the
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The masseter is a thick, somewhat quadrilateral muscle, consisting of three heads, superficial, deep and coronoid. The fibers of superficial and deep heads are continuous at their insertion.
427:. The innervation pathway is: gyrus precentralis > genu capsula interna > nucleus motorius nervi trigemini > nervus trigeminus > nervus mandibularis > musculus masseter.
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333:
to facilitate chewing of plant matter. The most obvious muscle of mastication is the masseter muscle, since it is the most superficial and one of the strongest.
293:
1070:
Takeuchi, Hayate; Matsuishi, Takashi Fritz; Hayakawa, Takashi (2024). "A tradeoff evolution between acoustic fat bodies and skull muscles in toothed whales".
514:, the masseter muscle, made redundant due to a shift in ingesting food from chewing to swallowing, provides the tissue for acoustic fat bodies, including the
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365:. Its fibers pass inferior and posterior, to be inserted into the angle of the mandible and inferior half of the lateral surface of the
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382:. The deep head of the muscle is partly concealed, anteriorly, by the superficial portion. Posteriorly, it is covered by the
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often experience various kinds of masseter tension, which is often treated with transdermal massages or stretches as a
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Mezey, Szilvia E.; Müller-Gerbl, Magdalena; Toranelli, Mireille; Türp, Jens
Christoph (2022-02-01).
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The left masseter muscle (red highlight), partially covered by superficial muscles such as the
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969:"The coronoid insertion of the human masseter muscle was well described in the 18th century"
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The masseter muscle can become enlarged in patients who habitually clench or grind (with
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Illustrated
Anatomy of the Head and Neck, Fehrenbach and Herring, Elsevier, 2012, p. 97
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An MRI of head with captions for masseter muscle and other structures around it
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Dissection, showing salivary glands of right side (Masseter visible at center)
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457:) their teeth and even in those who constantly chew gum. This masseteric
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The masseter muscle's positioning is a distinguishing feature of
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and from the anterior two-thirds of the inferior border of the
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The superficial head, the larger, arises by a thick, tendinous
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889:. Philadelphia, PA: Holt-Saunders International. p. 283.
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477:, but this one is easily noted, since it is on the face.
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The
American Heritage Dictionary of the English Language
647:
Masseter muscle. Deep dissection. Mummification process.
329:. Found only in mammals, it is particularly powerful in
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885:Romer, Alfred Sherwood; Parsons, Thomas S. (1977).
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49:. Unsourced material may be challenged and removed.
1032:"Mix it up Monday: Releasing the masseter muscle"
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967:Mudry, Albert; Jackler, Robert K. (2022-08-01).
507:and connects to the bone on the opposite side.
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843:, Houghton Mifflin Harcourt, archived from
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635:Mandibular division of the trifacial nerve.
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973:Annals of Anatomy - Anatomischer Anzeiger
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916:Annals of Anatomy - Anatomischer Anzeiger
810:
469:Finally, the muscle undergoes spasm with
109:Learn how and when to remove this message
16:One of the masticatory muscles in mammals
803:Dorland's Illustrated Medical Dictionary
503:, where it passes partially through the
443:
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858:
790:
1664:
1421:Levator labii superioris alaeque nasi
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587:Left zygomatic bone, temporal surface
823:Merriam-Webster's Medical Dictionary
796:
575:Left temporal bone, inferior surface
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47:adding citations to reliable sources
18:
690:
611:The arteries of the face and scalp.
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599:Mandible, outer surface, side view
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34:needs additional citations for
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357:, the temporal process of the
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539:Muscles of the head and neck.
1672:Muscles of the head and neck
1377:Levator palpebrae superioris
1189:Levator palpebrae superioris
871:Stedman's Medical Dictionary
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985:10.1016/j.aanat.2022.151922
929:10.1016/j.aanat.2021.151879
837:Houghton Mifflin Harcourt,
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623:Veins of the head and neck.
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403:Along with the other three
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1506:Depressor labii inferioris
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301:Anatomical terms of muscle
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1448:Levator labii superioris
1045:Kayes, Gillyane (2000).
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421:mandibular division (V3)
464:temporomandibular joint
438:medial pterygoid muscle
671:anatomical terminology
471:malignant hyperthermia
405:muscles of mastication
327:muscles of mastication
1637:Inferior longitudinal
1632:Superior longitudinal
1501:Depressor anguli oris
1372:Corrugator supercilii
1047:Singing and the Actor
678:Zygomasseteric system
444:Clinical significance
367:ramus of the mandible
139:(below) and both the
1416:Depressor septi nasi
1365:depressor supercilii
505:infraorbital foramen
43:improve this article
1443:Levator anguli oris
1034:. 14 December 2015.
887:The Vertebrate Body
1228:sphenomandibularis
826:, Merriam-Webster.
669:This article uses
499:creatures such as
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1317:Temporoparietalis
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874:, Wolters Kluwer.
526:Additional images
417:lateral pterygoid
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246:musculus masseter
196:Masseteric artery
180:ramus of mandible
178:Angle surface of
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58:"Masseter muscle"
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497:hystricognathous
491:In other animals
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425:trigeminal nerve
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1594:Genioglossus
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776:, "to chew".
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270:A04.1.04.002
245:
105:
96:
86:
79:
72:
65:
53:
41:Please help
36:verification
33:
1534:Soft palate
1453:Zygomaticus
1348:occipitalis
1206:Masticatory
1137:Extraocular
806:, Elsevier.
518:, used for
459:hypertrophy
399:Innervation
351:aponeurosis
235:Identifiers
1642:Transverse
1599:Hyoglossus
1488:Buccinator
1257:masseteric
1223:Temporalis
1078:: 148167.
979:: 151922.
922:: 151879.
851:2015-09-27
784:References
409:temporalis
331:herbivores
225:protrusion
69:newspapers
1625:Intrinsic
1587:Extrinsic
1353:frontalis
1310:posterior
1295:Auricular
1235:Pterygoid
1009:247374798
993:0940-9602
954:244844284
938:0940-9602
774:masasthai
772:μασᾶσθαι
766:Neo-Latin
700:(usually
696:The word
501:mole-rats
449:Pathology
373:Deep head
353:from the
337:Structure
221:Elevation
174:Insertion
1666:Category
1647:Vertical
1511:Mentalis
1483:Risorius
1399:Procerus
1305:superior
1300:anterior
1262:temporal
1218:Masseter
1172:inferior
1167:superior
1155:superior
1150:inferior
1001:35278659
946:34863910
798:Elsevier
698:masseter
665:See also
431:Function
323:masseter
229:mandible
124:Masseter
99:May 2015
1552:levator
1404:Nasalis
1240:lateral
1182:lateral
1145:Oblique
1127:of the
1125:Muscles
481:Singers
455:bruxism
423:of the
319:anatomy
258:D008406
216:Actions
152:Details
83:scholar
1579:Tongue
1547:tensor
1331:eyelid
1278:Facial
1252:Fascia
1245:medial
1177:medial
1162:Rectus
1053:
1007:
999:
991:
952:
944:
936:
893:
415:, and
321:, the
191:Artery
158:Origin
85:
78:
71:
64:
56:
1463:minor
1458:major
1431:Mouth
1327:Scalp
1005:S2CID
950:S2CID
770:Greek
768:from
684:Notes
516:melon
305:[
294:48996
241:Latin
203:Nerve
90:JSTOR
76:books
1391:Nose
1129:head
1072:Gene
1051:ISBN
997:PMID
989:ISSN
942:PMID
934:ISSN
891:ISBN
282:2105
265:TA98
253:MeSH
210:(V3)
143:and
62:news
1287:Ear
1080:doi
1076:901
981:doi
977:243
924:doi
920:240
510:In
317:In
289:FMA
277:TA2
227:of
45:by
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