Infratemporal Fossa Flashcards Preview

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Flashcards in Infratemporal Fossa Deck (12):

What and where is the infratemporal fossa?

Irregularly shaped space
Deep and inferior to zygomatic arch
Deep to ramus of mandible
Posterior to maxilla


Boundaries of the infratemporal fossa?

Laterally - ramus of mandible
Medially - lateral pterygoid plate
Anteriorly - posterior apsect of maxilla
Posteriorly - tympanic plate, mastoid and styloid process of temporal bone
Inferiorly - where medial pterygoid muscle attaches to mandible near its angle
Superiorly - infratemporal/inferior surface of greater wing of sphenoid


PICTURE Contents of the infratemporal fossa?

Inferior part of the temporalis muscle
Lateral and medial pterygoid muscles
Maxillary artery
Pterygoid venous plexus
Mandibular plus branches, inferior alveolar, lingual, buddy, and chorda tympani nerves
Otic ganglion


Openings of the infratemporal fossa and what goes through some of them?

Foramen ovale (mandibular division of fifth nerve)
Foramen spinosum (middle meningeal artery)
Alveolar canal
Inferior orbital fissure
Pterygomaxillary fissure


How does the infratemporal fossa communicate with the temporal fossa?

Interval between the zygomatic arch and the cranial bones


Which nerves can be blocked in the infratemporal fossa? Which one used in dentistry?

Mandibular nerve
Inferior alveolar nerve - dentist


Which nerves are also affected in mandibular nerve block?

Inferior alveolar


Where is the mandibular nerve injected?

As it enters the infratemporal fossa


Where is the inferior alveolar nerve injected?

Around the mandibular foramen in the medial side of the mandible


What is anaesthetised when the inferior alveolar nerve is injected?

All mandibular teeth to medial side
Skin and mucous membrane of lower lip


What is the other clinical relevance of the infratemporal fossa?

Often grow without detection for a long time
Advanced when diagnosed


Why can infection in the deep pterygoid plexus be of danger to the eye?

Connected with both ophthalmic and anterior facial veins and so drains into the cavernous sinus.
Pus within the pterygoid venous plexus may increase ophthalmic venous pressure
May lead to cavernous sinus thrombosis with resultant paralysis o extraocular muscles.