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Flashcards in Infratemporal Fossa Deck (16):

Where is the infra temporal fossa

Below the temporal fossa ( which is the depression on the lateral aspect of getting skull containing th temporal is muscle)
Anterior boundary - maxilla
Posterior extension is the spine of sphenoid and articular tubercle
Superior margin is grater wing of sphenoid
Medial boundary is lateral aspect of lateral pterygoid late
Lateral boundary is the ramus of mandible
Inferior boundary is medial pterygoid MUSCLE


What is i the infratemporal fossa

Lateral pterygoid - inferior part of temporal is muscle tendon onto coronoid
Medial pterygoid
Pterygoid venous plexus - engaged posterior extension of articular disc when close to rain blood away
Maxillary artery
Nerves - v3 ( sensory and motor branches) otic ganglion hangsmediAl pterygoid ( hypoglossal and secretomotor to parotid gland) chordae tympani ( branch of facial nerve that joins with Lingual nerve which is a branch of Vc)


Describe the structure of the lateral pterygoid

Superior and inferior heads
Superiorly positioned
Superior head is thin
Inferior head is larger


Describe the structure of the medial pterygoid

Superficial and deep heads
Vertical orientation


What does the medial pterygoid do and what is it innervated by

Jaw closing nd innervated by trigeminal motor root


What does the lateral pterygoid do and what innervates It

Jaw opening and the motor root of trigeminal


Describe what the pterygoid venous plexus is

Plexus of veins around the lateral pterygoid muscle
Connects with facuka and deep facial veins
Connects to cavernous sinus
Drains into maxillary vein
Displaced upper 8 be issues for bleeding


What dos the posterior branch of the retromandibular join with to form

Joins with posterior auricular to form the external jugular vein


What dos the terror retromandibular vein join with to form

Joins with facial vein to form common facial


what Forma the retromandibular vein

Maxillary vein and superficial temporal


What is the pathway of the maxillary artery

Pass through parotid gland through neck of mandible and sphenomandibular ligament to enter the infratemporal fossa


What dos the max artery arise form

The external carotid artery


What are the branches of the anterior division of CN V3

Many motor branches to masticatory muscles ( masseter, temporalis, medial and lateral pterygoid)

1 sensory branch is the long buccal nerve - from skin and mucosa of cheek


What are the branches of the posterior division of CN V3

3 branches

Auriculotemporal - sensory to skin in temporal region and sense to TMJ

Inferior alveolar - motor to mylohyoid and ABD

Lingual nerve - mixed is lingual sensory to tongue relay info of taste from anterior 2/3rds of the tongue


What are the branches of the inferior alveolar nerve

Nerve to mylohyoid and ABD on medial surface of mandible

Mental nerve - sensory to skin of mucosa of lower lip and chin and labial mucosa

Incisive branch - sensory to incisors and canine

Dental branches - sensory to premolars and molars


Why do we need to know about the infra temporal fossa

Local anaesthesia for restoration or extraction of mandibular teeth
Extraction of upper third molar teeth