Station 6 - The muscles of mastication Flashcards
Name the muscles of mastications
- Temporalis
- Masseter
- Medial pterygoid
- Lateral pterygoid
Identfiy the following muscles:
- Temporalis muscle
- Masseter muscle
- Medial pteryogid muslce
- Lateral pterygoid muscle
What are the 2 bony attachments of the temporalis muscle?
- Temporal fossa
- Coronoid process of the mandible
State the actions of the temporalis muscle on the mandible (2)
- Anteiror vertical fibres elevates the mandible
- Posterior horizontal fibres retracts the mandible
What are the 2 bony attachments of the masseter muscle?
What is the action of masseter muscle of the mandible?
Elevates the mandible (to close the mouth)
The lateral pterygoid plate attaches to where on pterygoid plate?
The LATERAL surface of the LATERAL pterygoid plate
The medial pterygoid plate attaches to where on pterygoid plate?
The MEDIAL surface of the LATERAL pterygoid plate
The lateral pterygoid plate attaches to where on the mandible?
NECK of the condyloid process of the mandible (and also the articular disc of this joint)
The medial pterygoid plate attaches to where on the mandible?
RAMUS of the mandible
Contraction of the 2 lateral pterygoid muscles causes
- Protrusion
Contraction of the lateral pterygoid muscle with the medial pterygoid muscle of the same side causes
- Side to side movement
Contraction of the two medial pterygoid plates causes
- Elevation
What muscles depress the mandible?
- Mylohoid
- Anteior belly of digasrtric
- Geniohyoid
(all of these muscles are suprahyoid muscles)
All the muscles of mastication (temporalis, masseter, medial pterygoid and lateral pterygoid) are innervated by what nerve?
What type of fibres?
- Branches of the mandibular division (V3) of the trigeminal nerve (CN V)
- Motor and sensory fibres
