Deep Face/Infratemporal fossa Flashcards
The space superior to the zygomatic arch is the …
The space inferior to the zygomatic arch is the ….
Temporal fossa
Infratemporal fossa
Which foramen are included in the infratemporal fossa?
Foramen ovale and Foramen spinosum
What are the borders of the infratemporal fossa?
Lateral: Ramus of the Mandible Medial: Lateral Pterygoid Plate Anterior: Maxilla Posterior: Tympanic plate, mastoid and styloid processes Superior: Greater wing of the sphenoid Inferior: Angle of the mandible
*Contents of the Infratemporal fossa:
Muscles: Inferior portion of the temporalis M.
Lateral and medial pterygoid muscles
Vasculature: Maxillary A., Pterygoid venous plexus
Nerves: Mandibular N. (V3) branches (Inferior alveolar N., Lingual N., Buccal N.), Chorda tympani (from CN VII), otic ganglion (from CN Ix)
Identify the contents of the Infratemporal fossa
Refer to drawings
Draw the course of the maxillary a.
Refer to drawings
What do these arteries supply?
Deep Auricular A.
Anterior Tympanic A.
- external acoustic meatus, external tympanic membrane and TMJ
- Internal tympanic membrane
What does the inferior alveolar a. supply?
Course?
Supplies mandible, mandibular teeth, chin and mylohyoid m.
-Enters the mandibular foramen into the mandible and branches into mylohyoid a. and mental a.
*What does the middle meningeal a. supply?
Course?
Lateral dura mater, trigeminal ganglion, facial n. and geniculate ganglion, tympanic cavity and tensor tympani m.
Enters the cranium via the foramen spinosum
*What does the Accessory Meningeal A. supply?
Course?
Extracranial muscles of infratemporal fossa, otic ganglion and sphenoid bone
Enters the cranium via foramen ovale
What do these arteries supply?
Deep Temporal A.
Pterygoid branches
Massteric A.
Temporalis M.
Pterygoid Ms.
TMJ and Masster M.
What does the Buccal A. supply?
What nerve does this run with?
Buccal fat pad, Buccinator M. and Buccal oral mucosa
Buccal N.
Veins of the Infratemporal fossa?
External jugular v. gives rise to the inferior alveolar v. and the venous plexus
Draw the course of V3 (mandibular N)
Refer to drawings
Muscular branches of the Mandibular N. (V3)
Medial pterygoid (tensor veli palatini and tensor tympani) Lateral pterygoid Masseteric Mylohyoid Anterior Digastric
Draw the course of the maxillary n.
Refer to drawings
Mandibular neck fracture can injure…
Mandibular ramus fracture can injure …
Mandibular corpus fracture can injure …
V3 (Mandibular N.)
Inferior Alveolar A and N.
Inferior Alveolar N.
Maxillary Artery relationship with Lateral pterygoid M.
There is variation. Can appear lateral or medial to the lateral pterygoid M.
Mandible elevators:
Temporalis M., Masseter M., Medial Pterygloids
Mandible depressors:
Lateral Pterygloids, Suprahyoid and infrahyoid msucles
Mandible protusion:
Lateral pterygloids, masseter, medial pterygloids
Mandible Retraction:
Temporalis
Lateral movements:
Ipsilateral temporalis and masseter + contralateral pterygloids
What type of joint is the TMJ?
Ligaments of TMJ and its origin/insertion:
Hinge
Stylomandibular L. (styloid process to posterior mandible
Sphenomandibular L. (spine of sphenoid to lingula of mandible)
Function of the sphenomandibular and stylomandibular ligaments:
Limit inferior excursion at TMJ
Which nerves are closely associated with the TMJ?
Facial N.
Mandibular N: Auriculotemporal N., Deep Temporal N.
TMJ and lateral pterygoid
Superior head of the Lateral pterygoid attaches to the posterior and anterior bands of the articular disc of the TMJ helping with the movement of the disc when opening the jaw
What happens to the TMJ during gape?
Less than 15 degrees gape = joint hinging
>15 degrees = whole head drops down the fossa and slides anteriorly on the articular tubercle (so your whole head is kind of “dislocating” anteriorly whenever you open your jaw)
Which nerves innervate the TMJ?
Sensory: Auriculotemporal N.
Posterior division of the deep temporal N. and Masseteric N.
Dislocation of the TMJ
Anterior dislocation. Can be caused by blow to the head
