Temporal and Infratemporal Fossa

Question 1

What are the posterior and superior boundaries of the temporal fossa?

Answer 1

Temporal Lines

Question 2

What are the Anterior Boundaries of the Temporal Fossa?

Answer 2

Frontal and Zygomatic Bones

Question 3

What are the Lateral Boundaries of the Temporal Fossa?

Answer 3

Zygomatic Arch

Question 4

What is the Inferior Boundary of the Temporal Fossa?

Answer 4

Infratemporal Crest (best seen when zygomatic arch has been removed)

Question 5

Name the contents of the temporal fossa.

Answer 5

1) Temporalis Muscle and Fascia
2) Deep Temporal Vessels and Nerves
3) Superficial Temporal Vessels
4) Auriculotemporal Nerve

Question 6

Anterior Border of Infratemporal Fossa

Answer 6

Posterior Aspect of Mandible

Question 7

Medial Border of Infratemporal Fossa

Answer 7

Lateral Pterygoid Plate

Question 8

The Temporomandibular Joint is a

Answer 8

Synovial Joint–modified hinge joint

Question 9

Articular Surfaces of the Temporomandibular Joint

Answer 9

• Mandibular Condyle

- Mandibular Fossa and Auricular Tubercle of Temporal Bone

Question 10

An _________, composed of fibrocartilage, divides the joint into two compartments.

Answer 10

Articular Disc

Question 11

Describe the compartments in the Temporomandibular Joint.

Answer 11

Superior Compartment- gliding movements for protrusion and retrusion

Inferior Compartment- hinge movements of depression/elevation

Question 12

Describe the Articular Disc of TMJ

Answer 12

Peripherally attached to the joint capsule

Anteromedially attaches to the tendon of the lateral pterygoid

Question 13

Describe the Joint or Articular Capsule of TMJ

Answer 13

• Attaches superiorly to the articular tubercle and the margins of the mandibular fossa
• Attaches inferiorly to the neck of the mandible

Question 14

Name the Temporomandibular Joint Ligaments

Answer 14

• Temporomandibular Ligament (Lateral Ligament)
• Stylomandibular Ligament
• Sphenomandibular Ligament

Question 15

4 Muscles of Mastication

Answer 15

1) Temporalis
2) Masseter
3) Medial Pterygoid
4) Lateral Pterygoid

Question 16

What are the muscles of mastication innervated by?

Answer 16

Branches of V3 (Mandibular Branch of Trigmenal Nerve)

Question 17

What is the origin of the Temporalis?

Answer 17

Inferior Temporal line, temporal fossa, temporalis fascia

Question 18

What is the insertion of the Temporalis?

Answer 18

Coronoid Process and Anterior surface of the ramus of the mandible

Question 19

What is the innervation of the Temporalis?

Answer 19

Anterior and posterior deep temporal nerves

Question 20

What are the actions of the Temporalis?

Answer 20

1) Elevation of mandible (closes mouth)
2) Retrusion of Mandible
3) Right and left lateral movements (grinding and chewing)

Question 21

What is the origin of the Masseter?

Answer 21

Inferior border and medial surface of the maxillary process of the zygomatic bone and zygomatic arch

Question 22

What is the Insertion of the Masseter?

Answer 22

Angle and lateral surface of the mandible

Question 23

Innervation of Masseter

Answer 23

Masseteric nerve

Question 24

Actions of Masseter

Answer 24

1) Elevation of Mandible
2) Right/Left Lateral Movements
3) Protrusion of the mandible
4) Retrusion of the mandible

Question 25

Lateral Pterygoid Plate Origin

Answer 25

Superior head: infratemporal surface of greater wing (of sphenoid) Inferior Head: Lateral surface of Lateral Pterygoid Plate

Question 26

Insertion of Lateral Pterygoid

Answer 26

Most fibers insert on pterygoid fovea on the anterior surface of the neck of the mandible; some fibers from the superior head insert on the joint capsule and articular disc of TMJ

Question 27

Innervation of the Lateral Pterygoid

Answer 27

Lateral Pterygoid Nerves

Question 28

Actions of the Lateral Pterygoid

Answer 28

1) Protrusion of mandible 2) Depresses mandible 3) Right/Left Lateral Chewing and grinding movements

Question 29

Origin of Medial Pterygoid

Answer 29

Deep head: Medial surface of Lateral Pterygoid Plate | Superficial head: Tuberosity of Maxilla

Question 30

Insertion of Medial Pterygoid

Answer 30

Medial surface and angle of mandible

Question 31

Innervation of Medial Pterygoid

Answer 31

Medial Pterygoid Nerve

Question 32

Actions of Medial Pterygoid

Answer 32

1) Elevation of Mandible 2) Protrusion of Mandible 3) Right and left lateral chewing/grinding movements

Question 33

Jaw Dislocation: True/False: Most often, falls on the chin or a direct blow to the chin will cause the neck of the mandible to fracture before posterior dislocation occurs

Answer 33

True

Question 34

In Jaw Dislocation... Excessive contraction of the _________ may cause the heads of the mandible to dislocate anteriorly past the articular tubercles The mandible remains open and the person cannot close it

Answer 34

Lateral Pterygoids

Question 35

In Jaw Dislocation... Posterior dislocation is uncommon due to the presence of the ____ and the strong lateral ligament

Answer 35

Postglenoid Tubercle

Question 36

In Jaw Dislocation.. | How is reduction performed?

Answer 36

Pressing downward and backward on the last molar teeth

Question 37

Communications with the Infratemporal Fossa: ______ thru the space b/w zygomatic arch and cranial wall

Answer 37

Temporal Fossa

Question 38

Communications with the Infratemporal Fossa: The ____ thru the inferior orbital fissure

Answer 38

Orbit

Question 39

Communications with the Infratemporal Fossa: The _________ thru the foramen ovale and foramen spinosum

Answer 39

middle cranial fossa

Question 40

Communications with the Infratemporal Fossa: ________ via the pterygomaxillary fissure

Answer 40

Pterygopalatine fossa

Question 41

Contents of the Infratemporal Fossa (6)

Answer 41

1) Medial and Lateral Pterygoid mm 2) Mandibular Division of V (V3) 3) Otic Ganglion 4) Chorda Tympani 5) Maxillary Artery and its branches 6) Maxillary vein and ptergoid venous plexus

Question 42

The Mandibular Division of the Trigmenal Nerve (V3) consists of

Answer 42

a large sensory component and a small motor component

Question 43

The Mandibular Division of the Trigmenal Nerve (V3) exits the

Answer 43

middle cranial fossa via the foramen ovale and enters the infratemporal fossa where it divides into anterior and posterior divisions

Question 44

The Mandibular Division of the Trigmenal Nerve (V3) branches come from

Answer 44

the main trunk and the anterior/posterior divisions

Question 45

What are the branches of the main trunk of V3

Answer 45

Nerve to the Medial Pterygoid and the Meningeal Branch

Question 46

Main Trunk of V3: What does the medial Pterygoid supply?

Answer 46

Medial pterygoid and gives small branches to the tensor tympani and tensor veli palatine