1 E: Mastication Flashcards
Where are the muscles of mastication located?
What do they attach to?
- At various depths in the parotid and infra temporal regions of the face
- They attach to the mandible & receive their MOTOR innervation
What controls the motor innervation of the muscles of mastication?
The mandibular division of the trigeminal nerve CN V3
What are the muscles of mastication and name the most powerful one?
1) Masseter (Most powerful)
2) Temporalis
3) Medial Pterygoid
4) Lateral Pterygoid
What is the innervation of the Masseter muscle?
Masseteric branch of mandibular nerve
What is the innervation of the Temporalis?
Deep temporal branches of the mandibular nerve
What is the innervation of the Lateral Pterygoid?
Lateral Pterygoid branch of the mandibular nerve
What is the innervation of the Medial Pterygoid ?
Medial Pterygoid branch of the mandibular nerve
What is the action of the Masseter muscle?
Closes jaw by elevating mandible
What is the action of the Temporalis?
Elevates mandible and closes jaw
What is the action of the Lateral Pterygoid?
Opens mouth.
- Together= protrudes
- Alternately= grinding action
What is the action of the Medial Pterygoid ?
Elevates mandible, closing jaw
Together= protrudes mandible Solo= protrudes one side
What is Mastication?
The mechanical breakdown of ingested material by the teeth
What is chemical breakdown?
Ingested material is mixed w/ saliva
What is a bolus?
A soft, cohesive mass to be swallowed
What is the Masticatory Cycle?
Complex 3-dimensional movement resulting in a “looping” pattern