MUSCLE OF MASTICATION

MUSCLE OF MASTICATION ARE AS FOLLOW;

1) MASSETER

Origin :
Superficial layer – zygomatic arch ( anterior 2/3 rd , lower border ), maxillar zygomatic process .
Deep layer – zygomatic arch deep surface .
Middle layer – zygomatic arch ( posterior 1/3 rd , lower border ).

Insertion :
Superficial layer – ramus of mandible ( lower part , lateral surface )
Deep layer – to rest of the ramus of mandible.
Middle layer – ramus of mandible ( central part ).

Action :

Elevation of mandible ( to close the mouth to bite ), protrusion ( Superficial fiber ).

Nerve supply :

Masseteric nerve ( anterior division of mandibular nerve branch ).

2) TEMPORALIS

 

Origin :

From Temporal fossa and temporal fascia.

Insertion :

coronoid process ( margin and deep surface ), ramus of mandible ( anterior border ).

Action :

Elevation of mandible , Side to side grinding movement , retraction of protruded mandible .

Nerve supply :

2 deep temporal branches ( from anterior division of mandibular nerve ).

3) LATERAL PTERYGOID

 

Origin :

Upper head – Infratemporal surface and sphenoid bone ( crest of greater wing ).
Lower fiber – lateral pterygoid plate ( lateral surface )

Insertion :

anterior surface of neck of mandible ( pterygoid fovea ).

Action :

Depression of mandible to open mouth , protudes mandible.

Nerve supply :

Branch of anterior division of mandibular nerve .

4) MEDIAL PTERYGOID

Origin :
Superficial head – maxillar tuberosity
Deep head – From lateral pterygoid plate ( medial surface ).

Insertion :

adjoining ramus of mandible , mandibular foramen ( below and behind ) , mylohyoid groove.

Action :

Elevation of mandible, protrude mandible.

Nerve supply :

Nerve to the medial pterygoid ( branch of main trunk of mandibular nerve ).

 

 

HERE IS THE END OF THE MUSCLE OF MASTICATION

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