Deep Face Infratemporal Fossa Wright DSA Flashcards
1
Q
What are the borders of the infratemporal fossa?
A
- 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
2
Q
What are the components of the infratemporal fossa?
A
- 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
3
Q
What are the branches of the mandibular nerve?
A
Trigeminal Nerve V3:
Sensory:
- Buccal
- Lingual
- Inferior alveolar
- Auriculotemporal
Muscular/Pharyngeal branches:
- Medial ptergoid
- Lateral pterygoid
- Masseteric
- Deep temporal
- Mylohyoid
4
Q
Maxillary branches?
A
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
5
Q
Maxillary artery in relation to lateral pterygoid?
A
- 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
6
Q
What muslces of mastication are supplied by Mandibular nerve (V3)?
A
- Temporalis
- Masseter
- Medial Pterygoid
- Lateral Pterygoid
7
Q
Masseter action, innervation, general origin and insertion
A
- 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
8
Q
Temoralis origin insert action innervation?
A
- 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
9
Q
Lateral Pterygoid OIAI
A
- 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
10
Q
Medial Pterygoid OIAI
A
- 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
11
Q
What muscles open the jaw?
A
- Digastric
- Geniohyoid
- Mylohyoid
- Stylohyoid
All assist in jaw opening
12
Q
What muscles depress hyoid and larynx?
A
- Sternohyoid:
- Ansa cervicalis
- Sternothyroid:
- Ansa cervicalis
- Thyrohyoid:
- Ventral rami C1
- Omohyoid:
- ansa cervicalis
13
Q
What depresses mandible
A
Lat Pterygoids suprahyoid and infrahyoid muscles
14
Q
What elevavtes mandible?
A
Temporalis
Masseter
Medial pterygoids
15
Q
What protrudes the mandible?
A
- Lat pterygoids
- Masseter
- Medial pterygoids
