Infratemporal Fossa and Temperomandibular Joint Flashcards
Where are the temporal fossa and infra temporal fossa located?
Space superior to the zygomatic arch
Space inferior to zygomatic arch
What is the lateral boundary of the infratemporal fossa?
ramus of mandible
What is the anterior boundary of the infratemporal fossa?
Maxilla
What is the medial boundary of the infratemporal fossa?
Lateral pterygoid plate
What is the roof of the infratemporal fossa?
Greater wing of the sphenoid
What is the posterior boundary of the infratemporal fossa?
Tympanic plate and mastoid
Styloid processes
What is the inferior boundary of the infratemporal fossa?
Angle fo the mandible
What muscles are found in the infratemporal fossa?
Inferior portion of the temporalis
Lateral and medial pterygoid muscles
What arteries are found in the infratemporal fossa?
Maxillary a.
What veins are found in the infratemporal fossa?
Pterygoid venous plexus
What nervous structures are found in the infratemporal fossa?
Inferior alveolar n. (V3) Lingual n. (V3) Buccal n. (V3) Chorda tympani (CN VII) Otic ganglion= how glossopharyngeal nerve serves parotid aka what covers the area
What are the branches of the mandibular (external) part of the maxillary a.?
Deep auricular a. Anterior tympanic a. Inferior aveolar a. --> mylohoid a. and mental a. Middle meningeal a. Accessory meningeal a.
What does the deep auricular a. supply?
external acoustic meatus
external tympanic membrane
TMJ
What does the anterior tympanic a. supply?
Internal TM
What does the inferior alveolar a. supply? How does it branch
Enters mandibular foramen and supples mandible, mandibular teeth, chin, and mylohyoid m.
Gives off mylohoid a. right before lingual foramen and goes through mental foramen to become mental a.
What does the middle meningeal a. supply?
Enters cranium via foramen spinosum and supplies dura mater of the lateral wall, trigeminal ganglion
facial nerve and geniculate ganglion
tympanic cavity
tensor tympani m.
What does the accessory meningeal a. supply?
Enters cranium via foramen ovale and supplies extracranial muscles of infratemporal fossa
Otic ganglion
Sphenoid Bone
What are the branches of the pterygoid part of the maxillary a.?
Deep temporal a.
Pterygoid branches
Massteric a.
Buccal a.
What does the deep temporal a. supply?
Temporalis m.
What does the pterygoid branches supply?
Pterygoid muscles
What does the massteric a. supply?
TMJ
Masseter M.
What does the buccal a. supply?
Buccal fat pad
Buccinator
Buccal Oral Mucosa
What are the 4 paired muscles of mastication? What other muscles aid in chewing?
Temporalis
Masseter
Lateral and Medial pterygoid
Buccinator: keeps food on molars so doesn’t drop to cheek/lower jaw
Obicularis oris: keeps food in mouth
What is the origin, insertion, innervation, and action of the masseter m.?
Zygomatic arch
angle and ramus of the mandible
Massteric n. (of CN V3)
Elevate mandible, protract, retract, side-to side rotation
What is the origin, insertion, innervation, and action of the temporalis m.?
Temporal fossa/fascia
Coronoid process of mandible
Deep temporal n. (CN V3)
Vertical: Elevate
Horizontal: Retract
Unilateral: lateral movement aka chewing
What is the origin, insertion, innervation, and action of the lateral pterygoid?
Greater wing of sphenoid and lateral pterygoid plate
Mandible and TMJ
Lateral pterygoid n. (CN V3)
Bilateral: protrudes
Unilateral: side to side with ipsilateral medial pterygoid
What is the origin, insertion, innervation, and action of the medial pterygoid?
Maxilla, palatine bone, and medial pterygoid plate and fossa
Pterygoid rugosity of the mandibular angle
medial pterygoid n. (CN V3)
Bilateral: elevate
Unilateral: side to side with ipsilateral lateral
What muscles elevate the mandible?
Temporalis
Masseter
Medial Pterygoids
What muscles depress the mandible?
lateral pterygoids
suprahyoid
infrahyoid
What muscles protrude the mandible?
Lateral and medial pterygoids
masseter
What muscles retrude the mandible?
temporalis
masseter
What muscles laterally move the mandible?
ipsilateral temporalis and masseter
contralateral pterygoids
What ligaments make up the TMJ? What are their jobs?
Sphenomandibular ligament
Stylomandibular ligament
Halt anterior dislocation of jaw= head of mandible pulled away from temporal bone
Limit inferior excursion
What is the role of the posterior and anterior bands of the anterior disc? What muscle attaches here?
Helps as head slides forward so when you gape you mouth more the disc stay in place
superior head of lateral pterygoid m.
What innervate the TMJ?
Auriculoptemporal n.
Posterior deep temporal n.
Masseteric n.
** Hilton’s law both masseter and temporalis cross joint so their nerves innervate **
What is the function of the buccal N. from the mandibular branch of the trigeminal?
What is the function of the buccal branch of the facial nerve?
Buccal nerve from V3 provides sensation to the interior cheek and part of the gums.
The buccal branch of the facial nerve provides motor innervation to the buccinator muscle.
What foramen does the inferior alveolar N. enter?
mandibular foramen
What muscles are innervated by V3?
Muscles of mastication.
Mylohyoid M. and anterior belly of the digastric M.. (Nerve to mylohyoid.)
Tensor veli palatini M.
Tensor tympani M.
Nerve to the tensor tympani comes out of what structure?
Otic ganglion
What kind of fibers are carried in the lingual nerve?
Sensory nerve fibers. (Not taste, which is carried by the chorda tympani, which runs with the lingual nerve, but is not IN the lingual nerve.)
Where can we find the otic ganglion?
Posterior and inferior to V3 as it exits the foramen ovale.
