infratemporal fossa and TMJ Flashcards
what passes through foramen ovale?
mandibular div of trigeminal nerve v3 and lesser petrosal nerve
what passes through foramen spinosum?
middle meningeal artery and meningeal branch of v3
contents of infratemporal fossa
pterygoid venous plexus maxillary artery l and m pterygoid muscles mandibular div of v3 autonomics (chorda tympani)
what connects the facial vein to the cavernous sinus?
pterygoid venous plexus
where does pterygoid venous plexus drain?
maxillary vein
maxillary artery course? subdivisions? branches?
lateral to lateral pterygoid m and horizontal across infratemporal fossa mandibular, pterygoid, and palatine subdivisions mandibular –> middle meningeal, inferior alveolar pterygoid–> masseteric, deep temporal, buccal, pterygoid palatine–> posterior superior alveolar, infraorbital, sphenopalatine, descending palatine,
what artery passes betwen the two roots of the auriculotemporal nerve?
middle meningeal artery
what artery travels w the inferior alveolar nerve? course?
inferior alveolar artery enters mandibular canal and leaves through the mental foramen
artery supply for lower jaw?
inferior alveolar artery
what arteries pass between pericranium and temporalis m?
deep temporal arteries
4 terminal branches of maxillary a
posterior superior alveolar infraorbital sphenopalatine descemding palatine
posterior superior alveolar
supplies molars/premolars pierces maxilla tuberosity
infraorbital a
out through inferior orbital fissure through floor of orbit to upper incisors ansd canines and sinus mucous membranes –> enters face through infraorbital foramen to maxillary face region
what artery supplies the nasal cavity sinuses?
sphenopalatine foramen
descending palatine artery
bifurcates in the pterygopalatine canal into lesser and greater palatine arteries –> supply the hard and soft palates lesser –> soft greater ->hard
lateral vs medial pterygoid muscles
lateral - horizontal, V3, opens mouth (protracts mandible), active in chewing medial - vertical, only m innervated by main trunk of V3, elevates and protracts mandible
what muscle elevates mandible? what muscle elevates AND retracts? both innervated by?
masseter temporalis (both) v3 mandibular nerve
mandibular division of v3
anterior vs posterior division
before main split, it gives off meningeal nerve and medial pterygoid nerve
***anterior div is smaller and mostly motor (deep temporal x2, buccal, lateral pterygoid, masseteric)
****posterior div is larger and mostly sensory (auriculotemporal, mylohyoid, mental, inferior alveolar, lingual)
two branches off main trunk V3?
meningeal nerve and medial pterygoid nerve
meningeal nerve is SENSORY. it enters cranial fossa via____________
supplies __________
foramen spinosum
dura of middle cranial fossa
buccal nerve
the only sensory branch in anterior mandibular div of v3
passes between the two heads of the lateral pterygoid muscle
what nerve passes between the two heads of the lateral pterygoid m?
buccal nerve
buccal nerve is NOT ——–
motor to the buccinator
all motor nerves of the anterior div of V3 enter infratemporal fossa between ______ and ________
the sensory branch _____ enters the infratemporal fossa between the __________
skull and upper head of lateral pterygoid m
buccal nerve; two heads of the lateral pterygoid m
three branches of posterior div of v3
auriculotemporal n
lingual n
inferior alveolar n
auriculotemporal nerve ascends anterior to ______ and posterior to_____
the ear; superficial temporal artery
sensory to TMJ?
auriculotemporal n
sensation from anterior 2/3 of tongue and mouth floor?
lingual nerve
what joins the lingual nerve?
chorda tympani
what descends posterior and lateral to lingual nerve?
inferior alveolar nerve
sensation to lower jaw and gums/teeth?
inferior alveolar artery
mental nerve branches off of ____ and passes through_____
supplies sensation to___
inferior alveolar n; mental foramen
chin/lower lip
other than the mental nerve, what else branches off the inferior alveolar nerve and what does it innervate?
nerve to the mylohyoid
mylohyoid and anterior belly of digastric muscle
what is the only motor branch of posterior v3 division
nerve to the mylohyoid
parasympathetic innervation
- of parotid gland?
- of submandibular and sublingual glands/taste sensation for ant 2/3?
- preganglionic cell bodies in inf. salivatory nucleus in upper medulla and course w CNIX –> postganglionic in the otic ganglion –> axons course with auriculotemporal nerve to the parotid gland
–
-preganglionic cell bodies in the superior salivatory nucles in pontine tegmentum –> course w CNVII and chorda tympani –> follows lingual nerve and preganglionic synapse in the submandibular ganglion –> postganglionic are secretomotor and innrvate the glands
and taste fibers have cell bodies in geniculate ganglion
TMJ is between
temporomandibular joint
head of mandible and articular tubercle/mandibular fossa of the temporal bone
tmj syndrome from
stress-related use of tmj like granding teeth –> causes facial pain
tmj
upper part of tmj is surrounded by _____
lower part is surrounded by _______
they limit?
loose fibers that attach articular disc to articular tubercle and mandibular fossa
-
tight fibers (same attachments)
-
limit forward and backward movement of the disc
articular disc is made of ______
type of joint?
hinge movements occur in lower or upper compartment?
dense fibrous CT
synovial joint
lower
what keeps head of mandible in the mandibular fossa?
three ligaments (1 lateral and 2 medial)
lateral = temporomandibular ligament (zygomatic process to the lateral neck of mandible) –> lateral stability
medial = sphenomandibular(medial to capsule) and stylomandibular (styloid process to andlge and posterior mandible_
tmj movement
only the mandible moves
4 muscles of mastication move it –> masseter, lateral and medial pterygoid, and temporalis
depression of mandible –> lateral pterygoid
elevation of mandible –> masseter and medial pterygoid and temporalis
