Deep Face Infratemporal Fossa Wright DSA Flashcards
What are the borders of the infratemporal fossa?
- Roof: Greater wing of sphenoid
- Inferior: Angle of mandible
- Medial: Lateral pytergoid plate
- Lateral: Ramus of mandible
- Anterior: Maxilla
- Posterior: Styloid process, Mastoid and tympanic plate
What are the components of the infratemporal fossa?
- Inferior portion of the temporalis
- Lateral and medial pterygoid muscles
- Maxillary artery
- Pterygoid venous plexus
- Nerves:
- Inferior alveolar (V3)
- Lingual (V3)
- Buccal (V3)
- Chorda Tympanii (CN7)
- Otic ganglion
What are the branches of the mandibular nerve?
Trigeminal Nerve V3:
Sensory:
- Buccal
- Lingual
- Inferior alveolar
- Auriculotemporal
Muscular/Pharyngeal branches:
- Medial ptergoid
- Lateral pterygoid
- Masseteric
- Deep temporal
- Mylohyoid
Maxillary branches?
Trigeminal V2:
- Meningeal nerve,
- Ganglionic branches,
- Zygomatic nerve
- Posterior superior alveolar nerve
- Infraorbital nerve
- Orbital branches
- Nasopalatine nerve
- Posterior superior nasal nerves (lateral and medial)
- Palatine nerves (greater and lesser)
- Pharyngeal nerve
Maxillary artery in relation to lateral pterygoid?
- Runs lateral to lateral pterygoid or medial to it
- Medial is the normal condition
- when it is lateral if you cut away mandibular ramus you can easily cut it
What muslces of mastication are supplied by Mandibular nerve (V3)?
- Temporalis
- Masseter
- Medial Pterygoid
- Lateral Pterygoid
Masseter action, innervation, general origin and insertion
- elevate mandible assist in protraction retraction and side to side
- Masseteric Nerve of V3
- Origin superficial head on maxillary process of zygomatic bone and arch, middle and deep head on zygomatic arch
- Inserts on mandibular ramus
Temoralis origin insert action innervation?
- Superficial head:
- Temporal fossa origin
- Coronoid process insert
- Deep temporal nerve of V3
- Vertical fibers elevate mandible
- Posterior fibers retract and unilaterally they move mandible lateral
- Deep head
- origin temporall fossa
- rest is same
Lateral Pterygoid OIAI
- Superior head:
- O: greater wing sphenoid
- I: Mandible and TMJ
- A: bilaterally protrude mandible open mouth unilaterally side to side movements
- I: Lateral pterygoid nerve V3
- Inferior head:
- O: Lateral pterygoid plate
- I: Mandible
- A: same
- I: same
Medial Pterygoid OIAI
- SUperficial head:
- O: maxilla and palatine bone
- Deep head:
- O: medial surface of lateral pterygoid plate and fossa
- I: pterygoid rugosity on medial suracace of mandibular angle
- I: medial pterygoid nerve V3
- A: bilaterally: elevates mandible assits lateral with protrusion
- Unilateral: protrude mandible and produce movement toward opposite side
- Side to side chewing movements
What muscles open the jaw?
- Digastric
- Geniohyoid
- Mylohyoid
- Stylohyoid
All assist in jaw opening
What muscles depress hyoid and larynx?
- Sternohyoid:
- Ansa cervicalis
- Sternothyroid:
- Ansa cervicalis
- Thyrohyoid:
- Ventral rami C1
- Omohyoid:
- ansa cervicalis
What depresses mandible
Lat Pterygoids suprahyoid and infrahyoid muscles
What elevavtes mandible?
Temporalis
Masseter
Medial pterygoids
What protrudes the mandible?
- Lat pterygoids
- Masseter
- Medial pterygoids
What retracts the mandible?
- Temporalis
- Masseter
What does lateral movement of mandible
- Ipsilateral temporalis and masseter
- Contralateral Pterygoids
What two ligaments of the TMJ limit inferior excursion at TMJ?
Sphenomandibular and Stylomandibular
Which part of lateral pterygoid fully articulates with the articular disc?
The superior head attahces completely to the articular disc
When you open your mouth all the way what happens?
The head comes out of the glenoid fossa
What enrves innervate TMJ?
- Auriculotemporal
- Masseteric nerve
- Deep temporal
All branches from V3 Mandibular nerve
If you want to anestasize the lower teeth what do you do?
Inject into the pterygomandibular raphe to hit the inferior alveolar nerve which will numb all teeth of lower jaw
