Head: Muscles of Mastication and Infra-temporal fossa Flashcards
What is the lateral pterygoid plate an extension of
the sphenoid bone
What are the boundaries of the infratemporal fossa
anterior: posterior maxilla
Posterior: styloid process
Medial: lateral pterygoid plane, tensor veli palatini, levaotr veli palatini, pharynx
Roof: base of skull (sphenoid bone and temporal bone
Lateral: Ramus of mandible
What nerve will travel through the foramen ovale
Mandibular nerve V3
Where are the foramen ovale and spinosum found
roof of infratemporal crest
What are the muscles of mastication within the head
Temporalis
Masseter
Lateral Pterygoid
Medial Pterygoid
What joint will the muscles of mastication act on
temporalmandibular joint
where does the lateral pterygoid muscle insert
TMJ
What things will cause depression of the mandible
gravity
mylohyoid
anterior digastric
medial pterygoid
What is the action of the temporalis muscle
elevate mandible
retracts mandible
What is the action of the masseter muscle
elevates mandible
little protraction
What are the attachments of the temporalis muscle
temporal fossa
coronoid process of mandible
What are the attachments of the masseter muscle
zygomatic arch to inferior angle of mandible
What are the attachments of the lateral pterygoid muscle
Proximal: greater wing of sphenoid and lateral aspect of lateral pterygoid plate
Distal: neck of mandible and capsule of TMJ
What are the attachments of the medial pterygoid muscle
Proximal: maxillary tuberosity; medial aspect of lateral pterygoid plate
Distal: ramus of mandible
What are the two places in which a “medial pterygoid sandwhich will be seen”
inferior angle of the mandible
lateral pterygoid plate
What are the bilateral and unilateral actions of lateral pterygoid
Bilateral: protrude mandible, depress mandible
Unilateral: grinding
What are the bilateral and unilateral actions of the medial pterygoid muscle
Bilateral: elevate and help protrude mandible
Unilateral: grinding
What are the muscles of mastication innervated by
V3
What type of joint is the temporomandibular joint
synovial modified hinge
What are the articular surfaces of TMJ covered with
fibrocartilage
What are the three articular surfaces of the temporomandibular joint
Condyle of mandible
mandibular fossa of temporal bone
articular tubercle of temporal bone
What is the function of the capsule of the TMJ
attaches neck of mandible to margins of mandibular fossa
What is the function of the lateral temporomandibular ligament
thickening of the capsule; prevents posterior dislocation
What does the articular disc divide the TMJ into
upper joint and lower joint cavities
What is the articular disc of the TMJ made of
fibrocartilage
What type of motion does the lower joint cavity of the TMJ allow for
rotation (hinge movement) during mandible depression
What type of motion does the upper joint cavity of the TMJ allow
translation (protraction and retraction; articular disc slides anteriorly over articular tubercle for greater ROM
What is the middle meningeal nerve a branch of and where is it seen
branch of V3
enters foramen spinosum
What does the middle meningeal nerve innervate
Dura
How will cranial nerve V3 exit the skull
foramen ovale
What are the origins of the 2 buccal nerves
buccal nerve from facial
buccal nerve from V3
What type of information is carried by buccal nerve from facial
GSA; sensory to the cheek
What type of information is carried by buccal nerve from V3
GSE; motor
Where will GSAs from auriculotemporal nerve supply sensation to
TMJ
Ear
Parotid region
Temple
What does the inferior alveolar nerve innervate
Teeth
Bottom gums
Sensation to chin and lower lip (via mental n)
What are the two types of information carried by chorda tympani
GVE: parasympathetic, GVAs follow
SVA
What does the GVE from chorda tympani allow for
innervation of salivary glands in and around the oral cavity
What does SVA of chorda tympani allow for
taste from anterior 2/3 of tongue
What is the maxillary artery a branch of
external carotid
Where does the maxillary artery originate within
parotid gland
The maxillary artery passes through the infratemporal foss to enter what
pterygopalatine fossa
How does the maxillary artery enter the pterygopalatine fossa
pterygomaxillary fissure
What muscle will branches of the maxillary artery emerge through
lateral pterygoid muscle
What are the 3 parts of the maxillary
retromandibular
pterygoid
pterygopalatine
What is the only branch of the maxillary artery that will not travel with accompanying nerve
lingual artery
What are the branches off the 1st part of the maxillary artery
Deep auricular Accessory meningeal Middle meningeal Inferior alveolar artery Anterior tympanic
What nerve will loop around the middle meningeal artery
auriculotemporal nerve
What does the middle meningeal artery supply
dura mater
What branches will come off the 2nd part of the maxillary artery
masseteric
pterygoid
deep temporal
buccal
What are the branches of the 3rd part of the maxillary artery
sphenopalatine
descending palatine
infraorbital
posterior alveolar
What structures have communication with the pterygoid venous plexus
cranial cavity+ brain orbit oral cavity+ teeth face+ paranasal sinuses Nasal cavities+nasopharynx
Where is the pterygoid venous plexus found
ITF
Where does the pterygoid venous plexus drain
retromandibular vein
