infra-temporal Flashcards
what makes up the anterior wall of the infratemporal fossa
the posterior surface of the maxilla bone
what makes up the medial wall of the infratemporal fossa
the lateral plate of the pterygoid process (sphenoid bone)
what makes up the roof of the infratemporal fossa
- squamous of the temporal bone
- greater wing of sphenoid bone
what makes up the lateral wall of the infratemporal fossa
ramus of mandible
what sort of joint is the temporomandibular (TMJ)
atypical synovial
- articulate surface is covered by fibrous cartilage
what is the difference between a typical and an atypical synovial joint
typical = hyaline cartilage at articulate surface
atypical = fibrous cartilage at articulate surface
what ligaments stabilise the TMJ
sphenomandibular ligament
stylomandibular ligament
lateral ligament
articular disc of TMJ
sits inside the joint, separating it into an upper and lower joint cavity
what muscles are involved in depressing the TMJ
- myohyoid
- genohyoid
- digastrics
if the temporalis and masseter muscle has a mass what movement of the TMJ will be limited?
elevation of the mandible will be limited
what muscles are involved in mastication
- temporalis
- masseter
- pterygoid muscles (both lateral and medial)
describe the location of the masseter muscle
runs from the angle and body of the mandible
up to the zygomatic arch and the maxillary process of the zygomatic arch
what nonvascular structures run inside the infratemporal fossa
- pterygoid muscles
- sphenomandibular ligament
what vascular structures run inside the infratemporal fossa
MAXILLARY artery
- middle meningeal artery (exit through foramen spinosus)
- inferior alveolar artery
what nerves run through the infratemporal fossa
- V3 mandibular nerve (via foramen ovale)
- glossopharyngeal nerve
- facial nerve
branches of V3 as it enters the infratemporal fossa
-be specific
gives off an anterior branch
- buccal nerve
gives off a posterior branch
- inferior alveolar nerve
- lingual nerve
- auricotemporal
lesser petrosal nerve
branch of glossopharyngeal (9)
- goes to tympanic plexus in middle ear then back to give the parasympathetic supply to the parotid gland
- runs through the infratemporal fossa on its course
what nerve does chord tympani join with
lingual nerve
importance of infection in pterygoid plexus
the pterygoid sinus gives off emissary veins which drain back to the cavernous sinus in the cranial cavity
- can cause dysfunction to internal carotid artery and abducens nerve that run inside sinus
borders of pterygopalatine fossa
anterior = posterior border of maxilla roof = sphenoid bone medially = palatine bone posteriorly = lateral plates of pterygoid process (sphenoid bone)
what enters the pterygopalatine fossa
foramen rotundum V2 (*purely sensory)
sphenopalatine foramen (opens to palatine bone)
-posterior epistaxis
what sits close to V2
internal carotid artery
- carotid canal runs close to foramen rotundum
what artery runs inside the pterygopalatine fossa
sphenopalatine artery off the maxillary artery
name 3 branches off the maxillary artery
- middle meningeal artery
- inferior alveolar artery
- sphenopalatine artery
