Muscles of Mastication Flashcards
Which joint do the muscles of mastication all act on?
The temperomandibular joint.
Where is the temperomandibular joint?
Between the head of the condylar process of the mandible and the articular fossa and articular tubercle of temporal bone.
Where is the temporalis muscle found?
In the temporal fossa, superior to inferior temporal line, attached laterally to surface of temporal fascia.
Where does the tendon formed by the inferior fibres of the temporalis muscle go?
Between zygomatic arch and infra temporal crest of sphenoid bone, to insert on coronooid process of mandible.
Name the four pairs of muscles of mastication.
Temporalis, masseter, buccinator, lateral and medial pterygoids.
Where is the masseter muscle found?
Arising from the zygomatic arch and running down the lateral surface of the ramus of the mandible to the angle of the mandible.
What is the buccinator?
An accessory muscle of mastication - moving food from the vestibule to between the teeth and the oral cavity proper.
Where is the buccinator?
Blends with orbicularis oris and runs posteriorly across cheeks.
What is the only muscle of mastication that can depress the mandible and open your mouth?
Lateral pterygoid muscle - by pulling anteriorly on the temperomandibular joint.
Where is the lateral pterygoid muscle?
Arises from the lateral side of the lateral pterygoid plate, runs to head of condylar process of mandible (also attaches to synovial membrane of temperomadibular joint).
Where is the medial pterygoid muscle?
Arises from medial surface of lateral pterygoid plate, runs down toward angle of mandible.
What shade is bone on an MRI?
Bone is dark.
What is flexion?
Bending, opposite of extension.
What is supination?
Hands palm up.
What is pronation?
Hands palm down.
