Deep Face And Infratemporal Fossa Flashcards
What are the muscles of mastication?
Innverated by?
Masseter
Temporalis
lateral pterygoid
Medial pterygoid
V3
What is the O and I of the:
masseter M.?
O: zygomatic bone, zygomatic arch
I: mandibular angle and Ramus
What is the O and I of the:
Temporalis M.?
O: temporal fossa
I: coronoid process of the mandible
What is the O and I of the:
Lateral Pterygoid?
O: greater wing of sphenoid bone, lateral pterygoid plate
I: mandible and TMJ articular disc (!!)
What is the O and I of the:
Medial Pterygoid
O: maxillary tuberosity and palatine bone(Superifical head),
lateral pterygoid plate and pterygoid fossa (Deep head)
I: mandibular angle
What opens the mouth?
Lateral pterygoid m.
Action of the:
masseter m.?
Elevate mandible
Protract, retract, side to side motion of mandible
Action of the:
Temporalis M. ?
Elevate mandible
Retract mandible
Lateral movement of mandible
Action of the:
Lateral Pterygoid?
Bilaterally: protrudes mandible and opens mouth
Unilaterally: side to side movement (grinding - works with medial pterygoid too)
Actions of the:
medial pterygoid?
Bilaterally:
Elevates and protrudes mandible
Unilaterally:
Protrude mandible and side to side chewing (grinding)
What does the TMJ articulate with?
Mandibular fossa
Head of mandible
Articular tubercle (from Squamous part of temporal bone)
What type of joint is the TMJ?
Hinge and glide joint
What are the articular surfaces separated by?
What are the bones covered by?
Articular disc
Fibrocartilage
What attaches to the articular disc of the TMJ?
Lateral pterygoid m.
What are the 3 extracapsular Ls.?
Function of these?
Lateral L.
Sphenomandibular L.
Stylomandibular L.
Stabilize TMJ
Which ligament of the TMJ prevents posterior dislocation?
Lateral temporomandibular L.
+articular tubercle from squamous part of temporal bone
What supplies the TMJ?
What innervates the TMJ?
Branches of ECA;
Superficial temporal a.
Deep auricular a.
V3
What occurs during gape at the TMJ?
Teeth are in occlusion
Everything is shifted posteriorly
Disc more anterior
What happens within 15 degrees of gape?
What happens over 15 degrees of gape?
Within: hinging
Over: whole head drops out of fossa and slides anteriorly on articular fossa, dislocating anteriorly, protrusion assisted by pterygoid
What is lateral pterygoid dysfunction?
Articular disc will not slide properly and will click against articular tubercle
What is a dislocation of the TMJ?
Results from blow to side of face, yawning, or taking a huge bite
Head of mandible slips out of mandibular fossa and is pulled anteriorly
Cannot close mouth
Facial and Auriculotemporal (V3) can be damaged
What happens for a posterior dislocation of the TMJ?
Requires a large amount of force to displace postglenoid tubercle and strong lateral ligament
What happens during arthritis of the TMJ?
Inflammation
Jaw pain, stiffness, joint grating
How do you block inferior alveolar n.?
Enter thru gums b/w coronoid notch and pterygomandibular raphe
What nerves could be injured during a dislocation of the TMJ?
Facial n.
Auriculotemporal n.
What happens if you fracture the neck of the mandible?
Otic ganglion is gone
No parotid gland stimulation
What happens if you fracture the ramus of the mandible?
No inferior alveolar n.
No mental n.
No sensation to chin
What happens if you fracture the corpus of the mandible?
Inferior alveolar n. Gone
Mental n. Gone
Where is the temporal fossa?
What muscle does it contain?
Space superior to zygomatic a.
Temporalis m. (Masseter over it).
What is the infratemporal fossa?
Space found below zygomatic arch
What are the boundaries of the infratemporal fossa?
Lateral: Ramus of mandible
Anterior: maxilla
Medial: Lateral pterygoid plate
Roof: greater wing of sphenoid
Posterior: tympanic plate, mastoid process, styloid process
Inferior: angle of mandible
What are the contents of the infratemporal fossa?
Inferior portion of temporalis m.
Lateral pterygoid m.
Medial pterygoid m.
Maxillary a.
Pterygoid venous plexus
V3
Chorda tympani
Otic ganglion
What a. Travels in the split of auriculotemporal n.?
Middle meningeal n.
What innervates tensor veli palatini?
V3
What innervates Levator Veli palatini?
CN 10
What are the three parts of the maxillary a.?
Mandibular
Pterygoid
Pterygopalatine
What are the As. Of the mandibular part of the maxillary A.?
Deep auricular a. Anterior tympanic a. Middle meningeal a. Inferior alveolar a. Accessory meningeal a.
What are the As. Of the pterygoid part of the maxillary A.?
Masseteric
Pterygoid
Deep temporal a.
Buccinator a.
What are the As. Of the pterygopalatine part of the maxillary A.?
Sphenopalatine a. (Anastomoses with ethmoidal)
Descending palatine a. Infraorbital a. Posterior superior alveolar a. Middle superior alveolar a. Pharyngeal branches Anterior superior alveolar a. A. Of the pterygoid canal
What does the deep auricular a. Go thru?
What does it supply?
EAM
External tympanic membrane, TMJ
What does the ANteiror tympanic a. Go thru?
Internal tympanic membrane
What does the inferior alveolar a. Enter?
What does it supply?
What does it give off?
Mandible foramen
Supplies mandible, mandibular teeth, chin, mylohyoid m.
Mylohyoid a. And mental a.
What does middle meningeal a. Enter cranium thru?
What does it supply?
Foramen spinosum
Supplies: Dura mater of lateral wall Trigeminal ganglion Facial n. Geniculate ganglion Tympanic cavity Tensor tympani m.
What does the accessory menigneal a. Enter cranium thru?
What does it supply?
Foramen ovale
Supplies:
Extracranial Ms. of infratemporal fossa
Otic ganglion
Sphenoid bone
What does the deep temporal a. Supply?
Temporalis m.
What do the pterygoid branches supply:
Pterygoid ms.
What do the masseteric a. Supply?
TMJ
Masseter m.
What does the buccal a. Supply?
What does it run with?
Buccal fat pad, buccinator, buccal oral mucosa
Buccal n. (V3)
