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anatomy block 3 CC > Temporal and Infratemporal Fossa > Flashcards

Temporal and Infratemporal Fossa Flashcards

1
Q

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

A

Temporal Lines

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2
Q

What are the Anterior Boundaries of the Temporal Fossa?

A

Frontal and Zygomatic Bones

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3
Q

What are the Lateral Boundaries of the Temporal Fossa?

A

Zygomatic Arch

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4
Q

What is the Inferior Boundary of the Temporal Fossa?

A

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

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5
Q

Name the contents of the temporal fossa.

A

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

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6
Q

Anterior Border of Infratemporal Fossa

A

Posterior Aspect of Mandible

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7
Q

Medial Border of Infratemporal Fossa

A

Lateral Pterygoid Plate

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8
Q

The Temporomandibular Joint is a

A

Synovial Joint–modified hinge joint

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9
Q

Articular Surfaces of the Temporomandibular Joint

A
  • Mandibular Condyle

- Mandibular Fossa and Auricular Tubercle of Temporal Bone

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10
Q

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

A

Articular Disc

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11
Q

Describe the compartments in the Temporomandibular Joint.

A

Superior Compartment- gliding movements for protrusion and retrusion

Inferior Compartment- hinge movements of depression/elevation

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12
Q

Describe the Articular Disc of TMJ

A

Peripherally attached to the joint capsule

Anteromedially attaches to the tendon of the lateral pterygoid

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13
Q

Describe the Joint or Articular Capsule of TMJ

A
  • Attaches superiorly to the articular tubercle and the margins of the mandibular fossa
  • Attaches inferiorly to the neck of the mandible
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14
Q

Name the Temporomandibular Joint Ligaments

A
  • Temporomandibular Ligament (Lateral Ligament)
  • Stylomandibular Ligament
  • Sphenomandibular Ligament
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15
Q

4 Muscles of Mastication

A

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

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16
Q

What are the muscles of mastication innervated by?

A

Branches of V3 (Mandibular Branch of Trigmenal Nerve)

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17
Q

What is the origin of the Temporalis?

A

Inferior Temporal line, temporal fossa, temporalis fascia

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18
Q

What is the insertion of the Temporalis?

A

Coronoid Process and Anterior surface of the ramus of the mandible

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19
Q

What is the innervation of the Temporalis?

A

Anterior and posterior deep temporal nerves

20
Q

What are the actions of the Temporalis?

A

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

21
Q

What is the origin of the Masseter?

A

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

22
Q

What is the Insertion of the Masseter?

A

Angle and lateral surface of the mandible

23
Q

Innervation of Masseter

A

Masseteric nerve

24
Q

Actions of Masseter

A

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

25
Q

Lateral Pterygoid Plate Origin

A

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

26
Q

Insertion of Lateral Pterygoid

A

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

27
Q

Innervation of the Lateral Pterygoid

A

Lateral Pterygoid Nerves

28
Q

Actions of the Lateral Pterygoid

A

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

29
Q

Origin of Medial Pterygoid

A

Deep head: Medial surface of Lateral Pterygoid Plate

Superficial head: Tuberosity of Maxilla

30
Q

Insertion of Medial Pterygoid

A

Medial surface and angle of mandible

31
Q

Innervation of Medial Pterygoid

A

Medial Pterygoid Nerve

32
Q

Actions of Medial Pterygoid

A

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

33
Q

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

A

True

34
Q

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

A

Lateral Pterygoids

35
Q

In Jaw Dislocation…

Posterior dislocation is uncommon due to the presence of the ____ and the strong lateral ligament

A

Postglenoid Tubercle

36
Q

In Jaw Dislocation..

How is reduction performed?

A

Pressing downward and backward on the last molar teeth

37
Q

Communications with the Infratemporal Fossa:

______ thru the space b/w zygomatic arch and cranial wall

A

Temporal Fossa

38
Q

Communications with the Infratemporal Fossa:

The ____ thru the inferior orbital fissure

A

Orbit

39
Q

Communications with the Infratemporal Fossa:

The _________ thru the foramen ovale and foramen spinosum

A

middle cranial fossa

40
Q

Communications with the Infratemporal Fossa:

________ via the pterygomaxillary fissure

A

Pterygopalatine fossa

41
Q

Contents of the Infratemporal Fossa (6)

A

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

42
Q

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

A

a large sensory component and a small motor component

43
Q

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

A

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

44
Q

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

A

the main trunk and the anterior/posterior divisions

45
Q

What are the branches of the main trunk of V3

A

Nerve to the Medial Pterygoid and the Meningeal Branch

46
Q

Main Trunk of V3:

What does the medial Pterygoid supply?

A

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

anatomy block 3 CC (2 decks)

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