Muscles Of Mastication Flashcards
What is the origin of a muscle
Where the bone is remained immobile for the action
What is the insertion of a muscle
The place where the bone moves during the action
What is the origin of the temporalis
Temporal fossa
What is the insertion of the temporalis
Coronoid process of the mandible
What is the action of the temporalis
Elevate mandible
What are the 4 muscles of mastication
Temporalis
Masseter
Lateral pterygoid
Medial pterygoid
What is the origin of the masseter
Zygomatic arch
What is the insertion of the masseter
ramus of mandible
What is the action of the masseter
Elevate mandible
What is the origin of the lateral pterygoid
Sphenoid and pterygoid plate
What is the insertion of the lateral pterygoid
Superior head TMJ
Inferior head Pterygoid fovea on neck of condyloid process of mandible
What is the action of the lateral pterygoid
Depress chin
Side to side motion of jaw
What is the origin of the medial pterygoid
Pterygoid plate of sphenoid and tuberosity of maxilla
what is the insertion of the medial pterygoid
Medial surface of the ramus and angle of mandible
What is the action of the medial pterygoid
Grinding motion
What is the innervation of the muscles of mastication
By a branch of the trigeminal nerve CN V3 (the mandibular nerve)
where does the superficial part of the masseter originate from
The maxillary process of the zygomatic bone
Where does the deep part of the masseter originate from
The zygomatic arch of the temporal bone
Where does the superficial head of the medial pterygoid originate from
The maxillary tuberosity and the pyramidal process of palatine bone
Where does the deep part of the medial pterygoid originate from
The medial aspect of the lateral pterygoid plate of the sphenoid bone
What is the action of the medial pterygoid
Elevates the mandible
Closing the mouth
Where does the superior head of the lateral pterygoid originate from
The greater wing of the sphenoid
Where does the inferior part of the lateral pterygoid originate from
The lateral pterygoid plate of the sphenoid
What is the action of the lateral pterygoid
Protract the mandible pushing the jaw forward
Side to side movement of jaw
Which part of the jaw allows for protrusion and retraction
The upper part of the joint of the mandible
Which part of the jaw allows for elevation and depression
The lower part of the joint of the mandible
Which 2 muscles assist in the depression of the jaw
Geniohyoid
Mylohyoid
What does the buccinator muscle do
Maintains the tightness of the cheeks and presses them against the molar teeth during chewing
What is the motor innervation of the buccinator
The buccal branches of the facial nerve CN VII
What are the 4 suprahyoid muscles
Stylohyoid muscle
Digastric muscle
Mylohyoid muscle
Geniohyoid muscle
What is the role of the suprahyoid muscles
Chewing, swallowing and speech
What are the 4 infrahyoid muscles
Sternohyoid
Sternothyroid
Thyrohyoid
Omohyoid
What is the role of the infrahyoid muscles
Active role in swallowing and the movement of the larynx
What does posselts envelope refer to
The range of motion of the mandible
