Muscles Of Mastication Flashcards
What are the main muscles of mastication?
Temporalis
Masseter
Lateral pterygoid
Medial pterygoid
What are the supplementary muscles of mastication?
Digastric
Geniohyoid
Mylohyoid
What is the nerve supply to the muscles of mastication?
Mandibular
What is the function of this muscle?
Masseter
Elevation
What nerve innervates the Masseter?
Masseteric nerve
What is the blood supply to the Masseter?
The masseteric branch of maxillary artery
What is this muscle?
Temporalis
What are the actions of the Temporalis muscle?
Elevation of the mandible (closing the mouth). Also performs retraction of the mandible (moving the jaw posteriorly).
What is the blood supply to the Temporalis muscle?
Deep temporal branches if the maxillary artery
What are the 2 parts of the Temporalis?
Anterior
Posterior
What direction do the anterior Temporalis fibres run?
Vertically
What direction do the posterior Temporalis fibres run?
Almost horizontally
What is the movements of the anterior posterior portion of the Temporalis?
Elevates mandible
What is the movement of the posterior portion of the Temporalis?
Retraction
What is the nerve supply to the Temporalis muscle?
Deep temporal branches of the mandibular nerve
What muscles are shown?
Medial pterygoid
What muscle is shown?
Lateral pterygoid
What innervates the lateral pterygoid?
Lateral pterygoid nerves
What blood vessel supplies the lateral pterygoid muscle?
Pterygoid branch of the maxillary artery
What movements does the lateral pterygoid permit? (Bilateral pterygoids)
Protrusion of mandible
Assist in depression
Once opened what are the main depressors of the mandible?
Digastric and geniohyoid muscles
What are the 2 heads of the lateral pterygoid muscle?
Superior and inferior
What muscle can cause unilateral movement of the mandible
Lateral pterygoid muscle
If you contract your left lateral pterygoid muscle, what way are you swinging you mandible?
Move right
The condyle move medially
What are the 2 parts of the medial pterygoid muscle?
Superficial and deep
Where does the superficial pterygoid lie?
Behind the upper 8s
Where do the pterygoid muscles attach on the sphenoid bone?
Lateral plate
Where does the inferior pterygoid muscle originate on the sphenoid bone?
Lateral surface of lateral plate
Where does the deep head of the pterygoid muscle originate?
The medial surface of the lateral plate
What muscle insert on the medial surface of the angle of the mandible?
Both heads of medial pterygoid
Superior and inferior
What is the movement of the medial pterygoid muscle? (Bilateral)
Elevation
Prehention (biting)
Assist the lateral pterygoids in the protrusion of the mandible
What are the movements of the medial pterygoids muscle? (Bilaterally)
Trituration
(Grind food)
