masseter muscle

同

咬筋

WordNet

1. make ones way by force; "He muscled his way into the office"
2. animal tissue consisting predominantly of contractile cells (同)muscular_tissue
3. one of the contractile organs of the body (同)musculus
4. authority or power or force (especially when used in a coercive way); "the senators used their muscle to get the party leader to resign"
5. a large muscle that raises the lower jaw and is used in chewing

PrepTutorEJDIC

1. 〈U〉(動物体の組織としての)『筋肉』,筋(きん);〈C〉(体の各部を動かす)筋肉 / 〈U〉力,(特に)筋力,腕力 / 《俗に》(…に)強引に割り込む《+『in on』(『into, through』)+『名』》
2. 筋肉の,筋力のある / 力ずくの

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/10/29 22:12:44」(JST)

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[Wiki en表示]

Masseter
Muscles of the head and neck.
Dissection, showing salivary glands of right side. (Masseter visible at center.)
Latin	musculus masseter
Gray's	subject #109 385
Origin	zygomatic arch and maxilla
Insertion	coronoid process, ramus of mandible, cementomaxillary tendon and cementomandibular tendon
Artery	masseteric artery
Nerve	mandibular nerve (V3)
Actions	elevation (as in closing of the mouth) and protraction of mandible
Antagonist	Platysma muscle

In human anatomy, the masseter is one of the muscles of mastication. In the animal kingdom, it is particularly powerful in herbivores 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.

Structure

The masseter is a thick, somewhat quadrilateral muscle, consisting of two heads, superficial and deep. The fibers of the two heads are continuous at their insertion.

Superficial Head

The superficial head, the larger, arises by a thick, tendinous aponeurosis from the zygomatic process of the maxilla, and from the anterior two-thirds of the inferior border of the zygomatic arch. Its fibers pass downward and backward, to be inserted into the angle of the mandible and inferior half of the lateral surface of the ramus of the mandible.

Deep Head

The deep head is much smaller, and more muscular in texture. It arises from the posterior 3rd 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 and the lateral surface of the coronoid process of the mandible. The deep head of the muscle is partly concealed, anteriorly, by the superficial portion. Posteriorly, it is covered by the parotid gland.

Innervation

Along with the other three muscles of mastication (temporalis, medial pterygoid and lateral pterygoid), the masseter is innervated by the mandibular division (V3) of the trigeminal nerve. The innervation pathway is: gyrus precentralis > genu capsula interna > nucleus motorius nervi trigemini > nervus trigeminus > nervus mandibularis > musculus masseter.

Action

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 medial pterygoid muscle, but it is stronger.

Examination

During an extraoral examination, stand near the patient and visually inspect and bilaterally palpate the muscle. Place the fingers of each hand over the muscle and ask the patient to clench his or her teeth several times.

Pathology

The masseter muscle can become enlarged in patients who habitually clench or grind (with bruxism) their teeth and even in those who constantly chew gum. This masseteric hypertrophy is asymptomatic and soft; it is usually bilateral but can be unilateral. Even if the hypertrophy is bilateral, there still may be asymmetry of the face due to unequal enlargement of the muscles.This extraoral enlargement may be confused with parotid salivary gland disease, dental infections, and 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 temporomandibular joint.

Finally, the muscle undergoes spasm with malignant hyperthermia as do other skeletal muscles but this one is easily noted since it is on the face.

Additional images

• Location of masseter muscle.

    Superficial portion

    Deep portion
• The left masseter muscle (red highlight), shown partially covered by superficial muscles such as the platysma muscle , the zygomaticus major muscle and the zygomaticus minor muscle.

• Masseter muscle

• Masseter muscle

• Masseter muscle

• Left temporal bone. Outer surface.

• Left temporal bone. Inferior surface.

• Left zygomatic bone. Temporal surface.

• Mandible. Outer surface. Side view.

• Base of skull. Inferior surface.

• The arteries of the face and scalp.

• Veins of the head and neck.

• Mandibular division of the trifacial nerve.

• Masseter muscle

• Masseter muscle

• Masseter muscle

• Masseter muscle

• Masseter muscle

• Cephalic extremity.Original mummification.

• Cephalic extremity.Original mummification.

See also

• Zygomasseteric system

References

External links

• LUC mass
• -100270003 at GPnotebook
• Masseter+muscle at eMedicine Dictionary

UpToDate Contents

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• 1. 救急外来における急性の筋力低下を訴える成人の評価 evaluation of the adult with acute weakness in the emergency department
• 2. 悪性高熱症：臨床診断および急性期のマネージメント malignant hyperthermia clinical diagnosis and management of acute crisis
• 3. 筋力低下の評価における筋力検査 muscle examination in the evaluation of weakness
• 4. COPDにおける呼吸筋のトレーニングおよび安静 respiratory muscle training and resting in copd
• 5. 悪性高熱症の易罹患性 susceptibility to malignant hyperthermia

English Journal

• Effect of chewing on dental patients with total denture: an experimental study.

• Tokmakci M, Zortuk M, Asyali MH, Sisman Y, Kilinc HI, Ertas ET.SourceDepartment of Biomedical Engineering, Faculty of Engineering, Erciyes University, 38039 Kayseri, Türkiye.
• SpringerPlus.Springerplus.2013 Dec;2(1):40. Epub 2013 Feb 8.
• In this study, we have explored the prospect of assessing and following level of total denture adaptation by use of EMG signals recorded during gum chewing. Total of 14 edentulous patients, 6 women and 8 men, with an average age of 63±9 years, were recruited. Separate EMG recordings were obtained f
• PMID 23504412

• Characterization of Longissimus thoracis, Semitendinosus and Masseter muscles and relationships with technological quality in pigs. 2. Composition of muscles.

• Realini CE, Pérez-Juan M, Gou P, Díaz I, Sárraga C, Gatellier P, García-Regueiro JA.SourceIRTA, Finca Camps i Armet, E-17121 Monells, Girona, Spain. Electronic address: carolina.realini@irta.es.
• Meat science.Meat Sci.2013 Jul;94(3):417-23. doi: 10.1016/j.meatsci.2013.03.007. Epub 2013 Mar 15.
• The composition of three porcine muscles (Longissimus thoracis: LT, Semitendinosus: ST, Masseter: MS) was characterized and its link with muscle quality was evaluated. The LT muscle had a higher content of tyrosine, tryptophan, and carbohydrates and a lower content of vitamin E and haem iron than th
• PMID 23566688

• Characterization of Longissimus thoracis, Semitendinosus and Masseter muscles and relationships with technological quality in pigs. 1. Microscopic analysis of muscles.

• Realini CE, Vénien A, Gou P, Gatellier P, Pérez-Juan M, Danon J, Astruc T.SourceIRTA, Monells, Finca Camps i Armet, E-17121 Monells, Girona, Spain. Electronic address: carolina.realini@irta.es.
• Meat science.Meat Sci.2013 Jul;94(3):408-16. doi: 10.1016/j.meatsci.2013.03.009. Epub 2013 Mar 15.
• Three porcine muscles (Longissimus thoracis, Semitendinosus, Masseter), known to have large differences in biochemical and histological traits, were fully characterized and the link between muscle structure and quality evaluated. The oxidative Masseter had more pigment, higher content of metmyoglobi
• PMID 23566687

Japanese Journal

• 臨床 咬筋に発生した顆粒球肉腫例

• ？本 真一,兵 行義,森田 倫正 [他]
• 耳鼻咽喉科臨床 105(12), 1187-1191, 2012-12-00
• NAID 40019500618

• A Paced Auditory Serial Addition Task evokes stress and differential effects on masseter-muscle activity and haemodynamics.

• Tanosoto Tomohiro,Arima Taro,Tomonaga Akio,Ohata Noboru,Svensson Peter
• European journal of oral sciences 120(4), 363-367, 2012-08-00
• … This study aimed to determine autonomic and jaw-muscle activities, and haemodynamic responses, to acute experimental mental stress in humans. … Oxygenated haemoglobin in the masseter muscle (14.6 ± 2.2 10(4) units mm(-3)) remained at an elevated level during the PASAT (15.5 ± 2.5 10(4) units mm(-3)), whereas deoxygenated haemoglobin (7.8 ± 2.3 10(4) units mm(-3)) showed a consistent decrease (to 6.8 ± 2.1 10(4) units mm(-3)). …
• NAID 120005158947

• Does restriction of mandibular movements during sleep influence jaw-muscle activity?

• Arima Taro,Tomonaga Akio,Inoue Shin-Ichiro,Ohata Noboru,Toyota Masahito,Minagi Shogo,Svensson Peter
• Journal of oral rehabilitation 39(7), 545-551, 2012-07-00
• … AIM: To investigate the effect of restriction of mandibular movements during sleep on jaw-muscle activity. … Baseline recordings of jaw-muscle activity during sleep without any oral appliance were performed and followed by one week of nightly use of the oral appliances. … During the last night in each session, jaw-muscle activity was recorded and compared to baseline values. …
• NAID 120005158955

Related Pictures

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★リンクテーブル★

リンク元	「咬筋」「masseteric」「masticatory muscle」
関連記事	「masseter」「muscle」

「咬筋」

　　[★]

英

masseter muscle (N,KH,KA)

ラ

musculus masseter, :masseter (K,KL)

関

咀嚼筋、咀嚼筋群、大唾液腺

起始

• 浅部は、上顎骨(頬骨弓)。深部は、側頭骨(頬骨弓)

停止

• 下顎骨(下顎枝)

神経

• 下顎神経(三叉神経の下顎枝)

機能

• 下顎を挙上。顎を閉じる。ものを咬む。

臨床関連

• 咬筋の緊張がテタニーの際の指標となる

「masseteric」

　　[★]

• 咬筋の

関

masseter、masseter muscle

「masticatory muscle」

　　[★]

咀嚼筋

関

masseter、masseter muscle

「masseter」

　　[★]

咬筋、咀嚼筋

関

masseter muscle、masseteric、masticatory muscle

　

「muscle」

　　[★]

• n.

• 筋肉