pterygoid fascia covers what to make what
clinical signif
covers medial pterygoid surface, splits around the lateral pterygoid
makes pterygospinous ligament
-ligament becomes calcified and can obstruct needle in maxillary nerve block
sphenomandibular ligament has what pass through it
maxillary artery, vein, and auriculotemporal nerve between it and neck of mandible
what are the muscles of mastication
Temporalis
masseter
pterygoids (medial and lateral)
what is the pterygoid fascia continuous with
the stylomandibular ligament
what are the muscles of mastication innervated by
the mandibular division of trigeminal nerve
-named according to corresponding muscle
what is the arterial supply to the muscles of mastication
2nd part of the maxillary artery (pterygoid)
-named according to the corresponding muscle
what kind of muscle is the buccinator muscle
what happens if paralyzed
what nerve innervates
accessory muscle of mastication
- if paralyzed, then food accumulates in vestibule area
- branch of VII
medial pterygoid in relationship to masseter muscle
located medial and parallel to the masseter musle
function of medial pterygoid m
closes the jaw
lateral pterygoid is ___ to the medial pterygoid
above
what is the 2 heads of the lateral pterygoid muscle called and insert
superior: sphenomeniscus m, inserts on TMJ
lower head: inserts on pterygoid fossa of mandible
what 2 structures run between the lateral pterygoid muscles
long buccal nerve and the maxillary artery
what strucutes course between the medial and lateral pterygoids?
inferior alveolar and lingual nerves
when the superior head of lateral pterygoid contracts what happens
moves articular disc forward and the head of the mandible forward
steps of the jaw-jerk reflex
rapid depression of chin receptors: stretch of neuromuscular spindles in masseter afferent fibers course in masseteric n mesencephalic nucleus of V motor nucleus of V efferent fibers in masseteric n effector: neuromuscular endplates in masseter m response: contraction of masseter m
normal opening of the mouth by
gravity
lateral pterygoid
wide opening of the mouth
lateral pterygoid
suprahyoid muscles
closing of the mouth
temporalis
masseter
medial pterygoid
TMJ has 2 joints, describe each
superior joint: gliding joint btwn mandibular fossa and articular tubercle
-permits sliding movement of head
inferior joint: hinge joint between articular disk and mandibular condyle
the articular disc is attached to what muscle
sphenomeniscus muscle (superior head lateral pterygoid m)
importance of stylomandibular ligament
changes transverse axis of roation from line between mandibular condyles to line between lingulae
changes in the mental angle with age
Newborn
4 year old child
adult
senior
newborn: 175
4 year old: 140
adult: 110-120
senior: 140
fractures of the neck of the mandible may compromise
maxillary a and v, or auriculotemporal nerve
fracture of the ramus of mandible may damage
lingual or inferior alveolar nerves
fracture of the body of mandible would compress
inferior alveolar nerve and vessels
what do you have to identify to find the long buccal nerve
the temporal-buccinator band
-if cut this you will cut the long buccal nerve bc immediately adjacent to each other
what nerves goes right across the medial pterygoid
long buccal
inferior alveolar
lingual
the trunk of the mandibular division of trigeminal nerve passes through what
foramen ovale
anterior part of mandibular division of trigeminal nerve convey what fibers
posteior part convey
SVE except buccal nerve (GSA)
posterior: GSA except nerve to mylohyoid muscle
what nerve branches around the middle meningeal artery
auriculotemporal nerve
what nerve supplies GSA sensory fibers to anterior 2/3 of tongue
lingual
what nerve supplies taste (SVA) fibers to anterior 2/3 of tongue
chorda tympani
lingual nerve has ____ attached to it
submandibular ganglion
what does the buccal nerve supply
GSA fibers to the epithelia of the inner and outer cheek
3 parts of the maxillary artery
mandibular portion
pterygoid portion
sphenopalatine portion
descending palatine artery supplies __ and signif
supplies posterior 2/3 of nasal cavity, and hard to stop this nose bleed
branches of maxillary artery within sphenopalatine fossa
descending palatine
sphenopalatine
posterior septal
posterior lateral nasal
branches of maxillary artery mandibular poritons
middle meningeal inferior alveolar posterior supeior alveolar infraorbital descending palatine