Infratemporal Fossa

Question 1

Where is the infra temporal fossa

Answer 1

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

Question 2

What is i the infratemporal fossa

Answer 2

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)

Question 3

Describe the structure of the lateral pterygoid

Answer 3

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

Question 4

Describe the structure of the medial pterygoid

Answer 4

Superficial and deep heads

Vertical orientation

Question 5

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

Answer 5

Jaw closing nd innervated by trigeminal motor root

Question 6

What does the lateral pterygoid do and what innervates It

Answer 6

Jaw opening and the motor root of trigeminal

Question 7

Describe what the pterygoid venous plexus is

Answer 7

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

Question 8

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

Answer 8

Joins with posterior auricular to form the external jugular vein

Question 9

What dos the terror retromandibular vein join with to form

Answer 9

Joins with facial vein to form common facial

Question 10

what Forma the retromandibular vein

Answer 10

Maxillary vein and superficial temporal

Question 11

What is the pathway of the maxillary artery

Answer 11

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

Question 12

What dos the max artery arise form

Answer 12

The external carotid artery

Question 13

What are the branches of the anterior division of CN V3

Answer 13

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

Question 14

What are the branches of the posterior division of CN V3

Answer 14

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

Question 15

What are the branches of the inferior alveolar nerve

Answer 15

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

Question 16

Why do we need to know about the infra temporal fossa

Answer 16

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