Muscles of mastication

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muscles of mastication

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  • is the voluntary process of grinding and chewing food into smaller pieces in the oral cavity turning it into a food bolus by muscles of mastication.
  • is the voluntary process of grinding and chewing food into smaller pieces in the oral cavity turning it into a food bolus by muscles of mastication.
  • is the voluntary process of grinding and chewing food into smaller pieces in the oral cavity turning it into a food bolus by muscles of mastication.
  • Upper n anterior fibres-elevatePosterior retract
  • Upper n anterior fibres-elevatePosterior retract
  • Upper n anterior fibres-elevatePosterior retract
  • Upper n anterior fibres-elevatePosterior retract
  • Muscles of mastication

    1. 1. MUSCLES OF MASTICATION 1 Prepared By: Mohsen M. Mirkhan
    2. 2. MASTICATION  Is the voluntary process of grinding and chewing food into smaller pieces in the oral cavity turning it into a food bolus so it becomes soft enough to swallow.  Allow the initial stages of digestion to occur by the enzymes in the saliva.  Masticatory muscles partake in specific movements of the temporomandibular joint (TMJ) during this process. 2
    3. 3. Muscles of Mastication A group of muscles associated with movements of the jaw (temporomandibular joint).  Their main function is chewing  All of them are attached to the mandible  They are concerned with:  Bite  Side to side movement  Chewing of the food  Secure then stabilize the mandible position  develop from the first pharyngeal arch.  innervated by the mandibular nerve (V3) which is a branch of the trigeminal nerve (CN 5). 3
    4. 4. MUSCLES OF MASTICATION 1) Masseter muscles 2) Temporalis muscles 3) Medial pterygoid muscles 4) Lateral pterygoid muscles 4
    5. 5. MASSETER MUSCLE 5  the most powerful muscle of mastication, Thick, somewhat quadrilateral muscle.  can be split into two parts; Deep and Superficial.  Action: Elevates the mandible, closing the mouth  Nerve supply  Blood supply Masseteric never branch of mandibular nerve V3 Masseteric artery from maxillary artery
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    7. 7. TEMPORALIS MUSCLE 7  It’s a large fan-shaped muscle. is a broad, radiating muscle, situated at the side of the head.  Originates from the temporal fossa.  Action: Elevates the mandible, retracts the mandible, pulling the jaw posteriorly.  Nerve supply  Blood supply Deep temporal branches of mandibular nerve. Deep temporal branches of maxillary artery
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    9. 9. LATERAL PTERYGOID MUSCLE 9  Has two heads: Superior and Inferior.  Action: acting together they protrude and depress the mandible. produce side to side movements.  Innervation: Ant. division of mandibular nerve through lateral pterygoid nerve.  Blood supply: Maxillary artery through the pterygoid branch.  Origin: Superior arises from greater wing of sphenoid bone Inferior arises from the lateral surface of the lateral pterygoid plate  Insertion: Fibers pass backward to be inserted into the neck of mandible and articular disc of TMJ.
    10. 10. MEDIAL PTERYGOID MUSCLE 10  Has two heads: Superior and Deep.  Action: assets in elevating and protrusion of the mandible acts together with lat. Pterygoid of the same side in rotating the mandible.  Innervation: Main trunk of mandibular nerve through nerve to medial pterygoid  Blood supply: Maxillary artery through the medial pterygoid artery  Origin: Superior arises from the maxillary tuberosity. Deep arises from medial surface of the lateral pterygoid plate  Insertion: fibers run downward, backward and laterally and are inserted into the medial surface of the angle of the mandible.
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    13. 13. PATHOLOGY 13 Trismus : refers to reduced opening of the jaws caused by spasm of the muscles of mastication, or may generally refer to all causes of limited mouth opening.  The affected patients find it very difficult and in some cases impossible to open the mouth.  The muscles are usually not the primary cause, however they can be included in the problem due to the spread of dental infection into the fascias that surround them.
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