infratemporal fossa LOs

Question 1

boundaries of infratemporal fossa

Answer 1

• laterally: ramus of mandible
• medially: lateral pterygoid plate
• anteriorly: posterior maxilla
• posteriorly: styloid and mastoid processes (of temporal bone)
• superiorly: greater wing of sphenoid bone
• inferiorly: mandibular attachment of medial pterygoid (medial surface of angle of mandible)

Question 2

infratemporal fossa arterial supply

Answer 2

Question 3

pterygoid plexus in spread of infection to cranial cavity

Answer 3

• facial veins (like superior labial vein) drain to the pterygoid plexus that has connections all over brain
• to cavernous sinus through emissaries

Question 4

nerves found in infratemporal fossa

Answer 4

• mandubular V3
• auriculotemporal
• inferior alveolar
• lingual
• chorda tympani

Question 5

components of TMJ

Answer 5

• articular tubercle: temporal bone, limits anterior translation of mandiblular head
• articular disk: synovial fibrocartilage, across joint
• mandibular fossa: of temporal bone
• head of mandible: into articular tubercle

Question 6

ligaments of TMJ

Answer 6

• joint capsule
• lateral ligament
  
  • from zygomatic process of temporal bone to neck of mandible
  • supports joint capsule in maintaining articulation, helps to limit depression and retraction
• stylomandibular ligament
  
  • from styloid process to angle of mandible
  • taut during moderate opening
• sphenomandibular ligament
  
  • from spine of sphenoid to lingua
  • check ligament to prevent excessive depression

Question 7

innervation of TMJ

Answer 7

• branches of V3: auriculotemporal, deep temporal, massateric

Question 8

muscle for elevation/closing TMJ

Answer 8

• masseter
• temporalis
• medial pterygoid

Question 9

muscle for depression/opening TMJ

Answer 9

• lateral pterygoid
• suprahyoid and infrahyoid muscles
• mainly gravity assisted: muscles are relaxed

Question 10

muscles for protrusion of TMJ

Answer 10

• lateral pterygoid
• medial pterygiood
• masseter

Question 11

muscles for retrusion of TMJ

Answer 11

• temporalis
• masseter
• masseter can do both protrusion and retrusion due to superior and deep heads

Question 12

muscles for lateral movement of TMJ

Answer 12

• same side medial and lateral pterygoids and masseter
• opposite side temporalis