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brau2308
on FreezingBlue Flashcards.
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Where is the masseteric region?
side of head, inferior to zygomatic arch and lateral to the ramus of the mandible
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Where is the temporal region?
on side of head above external auditory meatus and zygomatic arch
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What is included in the temporal region?
temporal fossa
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What does the temporal fossa contain?
temporalis muscle
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How are the fibers of the temporal muscle oriented?
both vertically and horizontally
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Where is the infratemporal region?
lies inferior to temporal fossa and deep to ramus of mandible
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Infratemporal region
Lateral wall:
ramus of mandible
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Infratemporal region
Anterior wall:
body of maxilla
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Infratemporal region
Medial wall:
lateral plat of pterygoid process
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Pterygopalatine fossa:
triangular space medial to site where lateral plate of pterygoid process abuts on maxilla
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Pterygomaxillary fissure:
opening into ptyergopalatine fossa from infratemporal fossa
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The pterygomaxillary fissure joins the what bony structure at a right angle?
inferior orbital fissure
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What are the contents of the pterygopalatine fossa?
- pterygopalatine ganglion
- 3rd part of maxillary artery
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How thick is the body of the maxilla?
eggshell thickness
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Infratemporal region
Roof:
under surface of greater wing of sphenoid bone
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What is the shape of the roof of the infratemporal fossa?
flat
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The roof of the infratemporal fossa is perforated by which foramen?
- foramen ovale
- foramen spinosum
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What passes through the foramen ovale?
mandibular branch of CN V
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What passes through the foramen spinosum?
middle meningeal A
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What are the two parts of the masseteric region?
superficial and deep
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What are the contents of the infratemporal fossa?
- pterygoid muscles
- maxillary artery
- pterygoid plexus
- several nerves
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What is the pterygoid plexus?
a venous plexus
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What is the most medial structure in the infratemporal region?
medial pterygoid muscle
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Where does the mandibular nerve enter the ifratemporal fossa?
via foramen ovale
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How long is the undivided trunk of the mandibular nerve?
2-3 mm in length
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What does the trunk of the mandibular nerve divide into?
- anterior division
- posterior division
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Is the anterior division of the mandibular nerve motor or sensory?
motor
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Is the posterior division of the mandibular nerve motor or sensory?
sensory
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What are the branches of the trunk of the mandibular nerve?
- meningeal nerve
- nerve to medial pterygoid muscle
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What are the branches of the anterior division of the mandibular nerve?
- masseteric
- deep temporal
- buccal
- nerve to lateral pterygoid m.
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Is the buccal branch of the anterior division of the mandibular nerve motor or sensory?
sensory
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What are the branches of the posterior division of the mandibular nerve?
- auriculotemporal
- lingual
- inferior alveolar
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How many parts is the maxillary artery divided into?
3 parts
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Where do the branches of the 1st and 3rd parts of the maxillary artery pass through?
bony canals
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Where do the branches of the 2nd part of the maxillary artery go?
go to supply muscles of mastication and buccinator muscle
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Where do branches of the first part of the maxillary artery arise?
as maxillary artery passes posterior to neck of mandible to travel anteromedially into infratemporal fossa
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What are the branches of the first part of the maxillary artery?
- deep auricular
- tympanic
- middle meningeal
- accessory meningeal
- inferior alveolar
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What does the deep auricular artery supply?
external auditory meatus
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What does the typanic artery supply?
typanic membrane
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What does the middle meningeal artery supply?
dura of brain
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What does the accessory meningeal artery supply?
dura
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What does the inferior alveolar artery supply?
lower teeth
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What are the branches of the 2nd part of the maxillary artery?
- masseteric
- two deep temporal
- pterygoid
- buccal branches
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What does the massteric artery supply?
masseteric muscle
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What do the two deep temporal arteries supply?
temporalis muscle
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What does the pterygoid artery supply?
lateral pterygoid muscle
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What do the buccal branches supply?
- buccinato muscle
- mucous membrane deep to buccinator and skin of cheek
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After the maxillary gives off branches to mm of mastication it leaves the infratemporal fossa by passing through what?
pterygomaxillary fissure
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After the maxillary artery passes through the pterygomaxillary fissure, where does it go?
pterygopalatine fossa
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Veins corresponding to branches of maxillary artery form what plexus?
pterygoid plexus
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Where are the pterygoid plexus?
around the pterygoid muscles
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The pterygoid plexus has important connections with which veins?
- 1. cavernous sinus
- 2. facial vein
- 3. pharyngeal plexus of veins
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What does the pteryogoid plexus pass through to connect with the cavernous sinus?
foramen ovale
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What connects the pterygoid plexus with the facial vein?
the deep facial vein
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Where does the pterygoid plexus end?
maxillary vein
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The maxillary vein follows which artery deep to the neck of the mandible?
maxillary artery
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The maxillary vein joins with what vein?
superficial temporal vein
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When the maxillary vein joins with the superficial temporal vein, it forms what?
retromandibular vein
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Why might an abcess tooth become dangerous if infected?
because of the pterygoid plexus connecting with the cavernous sinus
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Otic ganglion:
parasympathetic ganglion
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The otic ganglion is an important relay station for the preganglionic parasympathetic fibers of which nerve?
glossopharyngeal nerve (CN IX)
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The otic ganglion has preganglionic parasympathetic fibers of the glossopharyngeal nerve which are destined for what?
the parotid gland
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Where does the lesser petrosal nerve descend?
through foramen ovale
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When the lesser petrosal nerve descends through the foramen ovale it brings what kind of fibers to the otic ganglion?
preganglionic fibers
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The postganglionic fibers of the lesser petrosal nerve travel with which other nerve to the parotid gland?
auriculotemporal nerve
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What are the bony parts of the temporomadnibular joint (TMJ)?
- head of mandible
- articular surface of mandibular fossa
- articular tubercle of temporal bone
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What caps the head of the mandible and projects forward under the articular tubercle in the TMJ?
articular disc
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What does the articular disc of the TMJ do?
divide joint cavity into upper and lower compartments
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What is the articular disc firmly fixed to?
medal and lateral ends of condyle
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Wha tendon is partly inserted into the articular disc's anterior margin?
tendon of lateral pterygoid
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The articular disc implies two types of movement where?
one on each side of the disc
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What movements occur in the lower joint cavity?
simple hinge movements between head and disc
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What do hinge movements between head and disc permit?
depression and elevation of mandible
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In the upper joint cavity, the disc and head of the TMJ do what types of movements?
glide together on articular tubercle
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The disc and head of the TMJ glide together on articular tubercle permit what?
protrusion and retraction of mandible
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What ligaments are external to the joint capsule?
- lateral temporomandibular ligament
- stylomandibular ligament
- sphenomandibular ligament
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The thickened joint capsule is at which ligament?
lateral temporomandibular ligament
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What is mandibular elevation?
close the jaw
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What is depression of the mandible?
drop jaw/open widely
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What are lateral movements of the mandible?
grinding
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What is protrusion of the mandible?
anterior movement
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Besides muscles, what accomplishes depression of mandible?
gravity
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Which muscles allow mandibular elevation?
- temporalis
- masseter
- medial pterygoid mm
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What allows depression of mandible?
- gravity
- anterior belly of digastric
- mylohyoid
- lateral pterygoid mm
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What allows lateral movements of mandible?
- ispsilateral temporalis and masseter
- contralateral medial pterygoid
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What performs protrusion of the mandible?
lateral pterygoid
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What allows retraction of the mandible?
temporalis
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