03c: Infratemporal Fossa Flashcards

1
Q

Major borders of temporal fossa.

A

Medial: Pterion (frontal, parietal, temporal, greater wing sphenoid)
Lateral: Zygomatic arch

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2
Q

Temporal fossa contents.

A

Temporalis and supplying neurovasculature

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3
Q

Lateral border of infra temporal fossa.

A

Ramus of mandible

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4
Q

Medial border of infra temporal fossa.

A

Lateral pterygoid plate

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5
Q

Anterior border of infra temporal fossa.

A

Maxilla

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6
Q

Posterior border of infra temporal fossa.

A
  1. Styloid and mastoid processes

2. Tympanic plate

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7
Q

Superior border of infra temporal fossa.

A

Inferior surface of greater wing sphenoid

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8
Q

Musculoskeletal structures in infratemporal fossa.

A
  1. Medial and lateral pterygoid

2. TMJ

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9
Q

Nerves in infratemporal fossa

A
  1. Most V3 branches
  2. Chorda tympani (CN VII branch)
  3. Otic ganglion
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10
Q

Vasculature in infratemporal fossa.

A

Majority of maxillary artery

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11
Q

Which key landmark separates that divisions of maxillary artery? List each division and its relationship to that landmark.

A

Lateral pterygoid muscle;

  1. Mandibular (lateral)
  2. Pterygoid (along/superficial)
  3. Pterygopalatine (medial)
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12
Q

List branches off maxillary artery in first, (X), division.

A

X = mandibular

  1. Anterior tympanic
  2. Middle meningeal
  3. Inferior alveolar
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13
Q

Anterior tympanic artery supplies:

A

Middle ear

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14
Q

Which maxillary artery branch is often site of bleeding in (X) hematomas?

A

X = epidural;

Middle meningeal

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15
Q

Inferior alveolar artery travels into/through (X) and with (Y).

A
X = mandible;
Y = inferior alveolar nerve (V3)
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16
Q

Second, (X), division of maxillary artery supplies:

A

X = pterygoid

  1. Masseter and temporalis
  2. Pterygoid muscles
  3. Buccinator
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17
Q

Which division(s), if any, of maxillary artery course through pterygopalatine fossa?

A

Pterygopalatine (third)

18
Q

List branches off maxillary artery in third, (X), division. Star the ones give off in (Y), before it passes through (Z).

A
X = pterygopalatine
Y = infratemporal fossa
Z = pterygomaxillary fissure
  1. Posterior superior alveolar*
  2. Infraorbital
  3. Descending palatine
  4. Sphenopalatine
  5. Pharyngeal
  6. Artery of pterygoid canal
19
Q

Territory supplied by maxillary artery is drained by (X). Anteriorly, (X) drains into (Y) via (Z).

A
X = pterygoid plexus of veins
Y = facial vein
Z = deep facial vein
20
Q

Territory supplied by maxillary artery is drained by (X). Superiorly, (X) drains into (Y) via (Z).

A
X = pterygoid plexus of veins
Y = cavernous sinus or orbit
Z = emissary veins or inferior opthalmic vein
21
Q

Pterygoid plexus of veins is significant potential connection between:

A

External face and intracranial dural venous sinuses

22
Q

Muscles involved in protrusion of jaw.

A
  1. Lateral pterygoid

2. Medial pterygoid (assists)

23
Q

Muscles involved in elevation of jaw.

A
  1. Temporalis and masseter

2. Medial pterygoid

24
Q

Muscles involved in retraction of jaw.

A
  1. Posterior temporalis
  2. Deep part of masseter
  3. Geniohyoid and digastric
25
Q

Muscles involved in depression of jaw.

A
  1. Digastric
  2. Geniohyoid
  3. Mylohyoid
26
Q

Sphenomandibular ligament is on (X) surface of mandible and connects to which processes?

A

X = medial

Spine of sphenoid and lingula of mandible

27
Q

Stylomandibular ligament is on (X) surface of mandible and connects to which processes?

A

X = medial

Styloid process and angle of mandible

28
Q

Gently opening mouth. What motions at R and L TMJ?

A

Rotation of R andL mandible heads in mandibular fossae

29
Q

Widely opening mouth. What motions at R and L TMJ?

A

Heads of mandibles and articular discs move anteriorly until positioned under articular tubercle; mandible depressed

30
Q

Protrusion/retraction of jaw. What motions at R and L TMJ?

A

Heads of mandibles and articular discs move anteriorly until positioned under articular tubercle; mandible NOT depressed/elevated

31
Q

Chin moved laterally to right. What motions at R and L TMJ?

A

R: pivoting and retraction
L: sliding anteriorly (protraction)

32
Q

Which muscle is the primary retractor of mandible?

A

Temporalis

33
Q

(X) muscle is the mirror image of masseter.

A

X = medial pterygoid

34
Q

(X) mastication muscles close jaw and (Y) mastication muscles open jaw.

A
X = 3 (masseter, temporalis, medial pterygoid)
Y = 1 (lateral pterygoid)
35
Q

Which muscle of mastication attaches to (X) of TMJ?

A

X = joint capsule and disc

Superior head of lateral pterygoid

36
Q

T/F: Most of the TMJ has no sensory innervation.

A

False - disc doesn’t but rest of joint is highly sensitive

37
Q

TMJ sensory fibers primarily travel in branches of (X) nerves, which are collectively part of (Y) nerve.

A
X = Auriculotemporal, masseteric
Y = mandibular division of CN V
38
Q

Unilateral contraction of lateral pterygoid will cause jaw to:

A

Swing to contralateral side

39
Q

Muscles of mastication propioceptive awareness (to control force of bite) is carried by afferent fibers from (X) structures to (Y).

A
X = muscle spindles
Y = Mesencephalic Nucleus of V
40
Q

Vascularization of TMJ via branches of (X) artery/arteries.

A

X = superficial temporal and maxillary