Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
29 Cards in this Set
- Front
- Back
|
What are the four muscles of mastication?
|
1. Masseter
2. Temporalis 3. Medial pterygoid 4. Lateral pterygoid |
|
|
What is the origin of the masseter?
|
Superficial: Zygomatic process of the maxilla, anterior 2/3 zygomatic arch
Deep: Zygomatic arch (inner posterior 1/3) |
|
|
What is the insertion of the masseter?
|
Superficial: Angle of mandible
Deep: Lateral ramus |
|
|
What action(s) does the masseter provide?
|
Elevation
Ipsilateral excursion |
|
|
What is the origin of the Temporalis muscle?
|
Curvilinear lower temporal line.
Temporal fossa Temporal fascia |
|
|
What is the insertion of the Temporalis?
|
Medial surface of coranoid process
Anterior ramus (passing deep to the zygomatic arch) |
|
|
What is the action(s) of the Temporalis?
|
Elevation (anterior and superior fibers)
Retrusion Ipsilateral excursion |
|
|
What nerve(s) innervates the muscles of mastication?
|
V3 (Mandibular branch of the Trigeminal)
|
|
|
What is the origin of the medial pterygoid?
|
Medial side of lateral pterygoid plate.
|
|
|
What is the insertion of the medial pterygoid?
|
Medial side of mandibular angle.
|
|
|
What is the action(s) of the medial pterygoid?
|
Elevation
Protrusion Contralateral excursion |
|
|
What is the origin of the lateral pterygoid?
|
Sup: Roof of infratemporal fossa/infratemporal crest of greater wing of sphenoid bone
Inf: Lateral side of lateral pterygoid plate. |
|
|
What is the insertion of the lateral pterygoid?
|
Sup. Belly: Articular capsule and disc
Inf. Belly: Anterior condylar neck |
|
|
What is the action(s) of the lateral pterygoid?
|
Protrusion
Depression Contralateral excursion |
|
|
What is the origin of the buccinator?
|
Pterygomandibular raphe
Alveolar processes of the maxilla and mandible |
|
|
What is the insertion of the buccinator?
|
The angle of the mouth
|
|
|
What is the action of the buccinator?
|
Presses cheeks against food to hold food between molars
|
|
|
What nerve(s) innervate the buccinator?
|
Terminal branches of the facial nerve.
|
|
|
The superior constrictor muscle interconnects with the buccinator muscle at the:
a. poterior midline raphe b. pterygomandibular raphe c. mylohyoid raphe d. angle of the mandible e. maxillary tuberosity |
b. pterygomandibular raphe
|
|
|
The lateral pterygoid has which of the following actions:
1. Movement of the mandible to the opposite side 2. Elevation of the mandible 3. Protrusion of the mandible 4. Retrusion of the mandible a. 1,2 & 3 b. 1 & 3 c. 2 & 4 d. 4 only |
b. Movement of mandible to opposite side and protrusion of mandible
|
|
|
Which of the following is only an action of the temporalis muscle?
a. elevate the mandible b. protrude the mandible c. move the mandible to opposite side d. retrude the mandible e. depress the mandible |
d. retrude the mandible
|
|
|
Which muscle inserts on the anterior border of the (cartilaginous) articular disk?
a. superior belly of lateral pterygoid b. inferior belly of lateral pterygoid c. medial pterygoid d. temporalis e. masseter |
a. superior belly of lateral pterygoid
|
|
|
The only masticatory muscle capable of retruding the mandible?
a. lateral pterygoid b. medial pterygoid c. masseter d. temporalis |
d. temporalis
|
|
|
The parotid duct pierces which muscle?
a. masseter b. medial pterygoid c. buccinators d. levator anguli oris |
c. buccinators
|
|
|
Which muscle has as its origin from a surface of the lateral pterygoid plate and its insertion the angle of the mandible?
|
medial pterygoid
|
|
|
What specific muscle attaches to the neck of the mandibular condyle?
a. superior belly of the lateral pterygod b. inferior belly of the lateral pterygoid c. medial pterygoid d. temporalis e. masseter |
b. inferior belly of the lateral pterygoid
|
|
|
A patient with jaw pain and inability to close his mouth. You notice that his mouth is in an open position and the mandible is forward and is deviated to the right. Which muscle is probably in spasm?
a. right temporalis b. right lateral pterygoid c. right medial pterygoid d. left lateral pterygoid e. left masseter |
d. left lateral pterygoid
|
|
|
Stenson's (Parotid) Duct pierces which muscle to enter the oral cavity?
a. masseter b. levator labii superioris c. temporalis d. buccinator e. levator labii superioris |
d. buccinator
|
|
|
A patient presents with jaw pain and inability to close his mouth. You notice that his mouth is in an open position and the mandible is protruded (forward) and is deviated to the left. Which muscle is probably in spasm (contracted)?
a. right temporalis b. right lateral pterygoid c. left medial pterygoid d. left lateral pterygoid e. right masseter |
b. right lateral pterygoid
|
