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Module 3 Revision > Anatomy: Infratemporal Fossa > Flashcards

Anatomy: Infratemporal Fossa Flashcards

1
Q

What is the lateral boundary of the ITF?

A

Ramus of the mandible

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2
Q

What is the superior border of the ITF?

A

Zygomatic arch

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3
Q

What is the posterior border of the ITF?

A

Tympanic plate and mastoid process

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4
Q

What is the anterior boundary of the ITF?

A

Posterior maxilla

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5
Q

What is the medial boundary of the ITF?

A

Lateral pterygoid plate

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6
Q

Where is the ITF in relation to Pterygopalatine fossa?

A

Medial

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7
Q

What are the muscles contained in the ITF?

A

Inferior part of temporalis
Medial pterygoid
Lateral pterygoid

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8
Q

What are the important nerves contained in the ITF?

A
  • CN V3/c
  • lingual nerve
  • inferior alveolar nerve
  • chorda tympani
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9
Q

In the ITF, what are the two main nerve branches of CN V3/c?

A

The inferior alveolar nerve and the lingual nerve

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10
Q

What are the two main arteries contained in the ITF?

A
  • middle meningeal artery
  • maxillary artery + branches
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11
Q

What is the function of the lateral pterygoid muscle?

A

Opens the jaw

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12
Q

Where is the origin of the superior head of the lateral pterygoid?

A

The infratemporal crest of greater wing of sphenoid

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13
Q

Where is the origin of the inferior head of the lateral pterygoid?

A

Lateral surface of pterygoid plate

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14
Q

Where does the lateral pterygoid muscle insert into?

A

The mandibular forea and TMJ capsule/articular disc

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15
Q

What nerve innervates the lateral pterygoid muscle?

A

CN V3/c

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16
Q

What is the function of the medial pterygoid muscle?

A

Closes the jaw

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17
Q

What is the origin of the deep head of the medial pterygoid muscle?

A

The medial surface of the lateral pterygoid plate

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18
Q

Where is the origin of the superficial head of the medial pterygoid muscle?

A

The tuberosity of the maxilla

19
Q

Where does the medial pterygoid muscle insert?

A

The medial surface of the mandibular ramus

20
Q

What nerve innervates the medial pterygoid muscle?

A

CN V3/c

21
Q

What complex structure forms around the lateral pterygoid muscle?

A

The pterygoid venous plexus

22
Q

What vein runs centrally through the venous plexus to the face?

A

The maxillary vein

23
Q

What vein does maxillary vein branch from?

A

The retromandibular vein

24
Q

What is the clinical relevance of the pterygoid plexus when giving a block injection?

A

Important consideration as accidental perforation could result in haematoma

25
Q

Where does the maxillary artery branch from?

A

The external carotid artery

26
Q

How many parts make up the maxillary artery?

A

3

27
Q

What are the important arteries to remember in the 1st part of the maxillary artery?

A
  • middle meningeal artery
  • inferior alveolar artery
28
Q

What are the important arteries to remember in the 2nd part of the maxillary artery?

A
  • deep temporal arteries
  • buccal artery
29
Q

What are the important arteries to remember in the 3rd part of the maxillary artery?

A
  • Sphenopalatine artery
  • infra-orbital artery
  • posterior superior alveolar artery
30
Q

What nerve modality does the trigeminal ganglion ( arising directly from pons) have?

A

sensory

31
Q

Where does the motor root unite with the sensory of CN V ?

A

Outside the cranial vault

32
Q

What division of CN V is the only one to have both motor and sensory roots?

A

CN V3/c

33
Q

What are the two divisions of the mandibular nerve?

A

Anterior and posterior

34
Q

What are the motor nerve branches of the anterior part of CN V3?

A

Deep temporal

35
Q

What is the sensory nerve branch of the anterior part of CN V3?

A

buccal nerve

36
Q

What are the 5 branches of the posterior part of CN V3?

A
  • auriculotemporal
  • inferior alveolar nerve
  • nerve to mylohyoid
  • mental nerve
  • lingual nerve
37
Q

All nerves of the posterior aspect of the mandibular nerve are sensory. True or false?

A

False. The nerve to mylohyoid is motor.

38
Q

Which two nerves of the posterior aspect of the mandibular nerve are most clinically relevant?

A
  • inferior alveolar nerve
  • lingual nerve
39
Q

Describe the passage of nerve fibres from CN IX to the parotid gland

A
  • CN IX sends pre-syntaptic parasympathetic fibres to OTIC GANGLION
  • parasympathetic fibres ‘ hitch a ride’ via the auriculotemporal branch of CN V3 to reach the parotid gland
40
Q

What CN is the chorda tympani a branch of?

A

CN VII

41
Q

What nerve does the chorda tympani pass parasympathetic fibres through and “hitch a ride on” in order to innervate the submandibular and sublingual glands?

A

The lingual nerve branch of CN V3

42
Q

What are the 4 key clinical importances of the ITF?

A
  • muscles involved in movement of mandible/mastication
  • blood supply to teeth via maxillary artery
  • pterygoid plexus
  • mandibular nerve and relationships
43
Q

How can infection of the ptrygoid plexus arise?

A

Due to communication between the superficial face and dural venous sinuses ( pterygoid plexus inferior to cavernous sinus)

Module 3 Revision (20 decks)

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