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Exam 3: Masseteric, Temporal and Infratemporal Regions
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Where is the masseteric region?
side of head, inferior to zygomatic arch and lateral to the ramus of the mandible
Where is the temporal region?
on side of head above external auditory meatus and zygomatic arch
What is included in the temporal region?
temporal fossa
What does the temporal fossa contain?
temporalis muscle
How are the fibers of the temporal muscle oriented?
both vertically and horizontally
Where is the infratemporal region?
lies inferior to temporal fossa and deep to ramus of mandible
Infratemporal region
Lateral wall:
ramus of mandible
Infratemporal region
Anterior wall:
body of maxilla
Infratemporal region
Medial wall:
lateral plat of pterygoid process
Pterygopalatine fossa:
triangular space medial to site where lateral plate of pterygoid process abuts on maxilla
Pterygomaxillary fissure:
opening into ptyergopalatine fossa from infratemporal fossa
The pterygomaxillary fissure joins the what bony structure at a right angle?
inferior orbital fissure
What are the contents of the pterygopalatine fossa?
pterygopalatine ganglion
3rd part of maxillary artery
How thick is the body of the maxilla?
eggshell thickness
Infratemporal region
Roof:
under surface of greater wing of sphenoid bone
What is the shape of the roof of the infratemporal fossa?
flat
The roof of the infratemporal fossa is perforated by which foramen?
foramen ovale
foramen spinosum
What passes through the foramen ovale?
mandibular branch of CN V
What passes through the foramen spinosum?
middle meningeal A
What are the two parts of the masseteric region?
superficial and deep
What are the contents of the infratemporal fossa?
pterygoid muscles
maxillary artery
pterygoid plexus
several nerves
What is the pterygoid plexus?
a venous plexus
What is the most medial structure in the infratemporal region?
medial pterygoid muscle
Where does the mandibular nerve enter the ifratemporal fossa?
via foramen ovale
How long is the undivided trunk of the mandibular nerve?
2-3 mm in length
What does the trunk of the mandibular nerve divide into?
anterior division
posterior division
Is the anterior division of the mandibular nerve motor or sensory?
motor
Is the posterior division of the mandibular nerve motor or sensory?
sensory
What are the branches of the trunk of the mandibular nerve?
meningeal nerve
nerve to medial pterygoid muscle
What are the branches of the anterior division of the mandibular nerve?
masseteric
deep temporal
buccal
nerve to lateral pterygoid m.
Is the buccal branch of the anterior division of the mandibular nerve motor or sensory?
sensory
What are the branches of the posterior division of the mandibular nerve?
auriculotemporal
lingual
inferior alveolar
How many parts is the maxillary artery divided into?
3 parts
Where do the branches of the 1st and 3rd parts of the maxillary artery pass through?
bony canals
Where do the branches of the 2nd part of the maxillary artery go?
go to supply muscles of mastication and buccinator muscle
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
What are the branches of the first part of the maxillary artery?
deep auricular
tympanic
middle meningeal
accessory meningeal
inferior alveolar
What does the deep auricular artery supply?
external auditory meatus
What does the typanic artery supply?
typanic membrane
What does the middle meningeal artery supply?
dura of brain
What does the accessory meningeal artery supply?
dura
What does the inferior alveolar artery supply?
lower teeth
What are the branches of the 2nd part of the maxillary artery?
masseteric
two deep temporal
pterygoid
buccal branches
What does the massteric artery supply?
masseteric muscle
What do the two deep temporal arteries supply?
temporalis muscle
What does the pterygoid artery supply?
lateral pterygoid muscle
What do the buccal branches supply?
buccinato muscle
mucous membrane deep to buccinator and skin of cheek
After the maxillary gives off branches to mm of mastication it leaves the infratemporal fossa by passing through what?
pterygomaxillary fissure
After the maxillary artery passes through the pterygomaxillary fissure, where does it go?
pterygopalatine fossa
Veins corresponding to branches of maxillary artery form what plexus?
pterygoid plexus
Where are the pterygoid plexus?
around the pterygoid muscles
The pterygoid plexus has important connections with which veins?
1. cavernous sinus
2. facial vein
3. pharyngeal plexus of veins
What does the pteryogoid plexus pass through to connect with the cavernous sinus?
foramen ovale
What connects the pterygoid plexus with the facial vein?
the deep facial vein
Where does the pterygoid plexus end?
maxillary vein
The maxillary vein follows which artery deep to the neck of the mandible?
maxillary artery
The maxillary vein joins with what vein?
superficial temporal vein
When the maxillary vein joins with the superficial temporal vein, it forms what?
retromandibular vein
Why might an abcess tooth become dangerous if infected?
because of the pterygoid plexus connecting with the cavernous sinus
Otic ganglion:
parasympathetic ganglion
The otic ganglion is an important relay station for the preganglionic parasympathetic fibers of which nerve?
glossopharyngeal nerve (CN IX)
The otic ganglion has preganglionic parasympathetic fibers of the glossopharyngeal nerve which are destined for what?
the parotid gland
Where does the lesser petrosal nerve descend?
through foramen ovale
When the lesser petrosal nerve descends through the foramen ovale it brings what kind of fibers to the otic ganglion?
preganglionic fibers
The postganglionic fibers of the lesser petrosal nerve travel with which other nerve to the parotid gland?
auriculotemporal nerve
What are the bony parts of the temporomadnibular joint (TMJ)?
head of mandible
articular surface of mandibular fossa
articular tubercle of temporal bone
What caps the head of the mandible and projects forward under the articular tubercle in the TMJ?
articular disc
What does the articular disc of the TMJ do?
divide joint cavity into upper and lower compartments
What is the articular disc firmly fixed to?
medal and lateral ends of condyle
Wha tendon is partly inserted into the articular disc's anterior margin?
tendon of lateral pterygoid
The articular disc implies two types of movement where?
one on each side of the disc
What movements occur in the lower joint cavity?
simple hinge movements between head and disc
What do hinge movements between head and disc permit?
depression and elevation of mandible
In the upper joint cavity, the disc and head of the TMJ do what types of movements?
glide together on articular tubercle
The disc and head of the TMJ glide together on articular tubercle permit what?
protrusion and retraction of mandible
What ligaments are external to the joint capsule?
lateral temporomandibular ligament
stylomandibular ligament
sphenomandibular ligament
The thickened joint capsule is at which ligament?
lateral temporomandibular ligament
What is mandibular elevation?
close the jaw
What is depression of the mandible?
drop jaw/open widely
What are lateral movements of the mandible?
grinding
What is protrusion of the mandible?
anterior movement
Besides muscles, what accomplishes depression of mandible?
gravity
Which muscles allow mandibular elevation?
temporalis
masseter
medial pterygoid mm
What allows depression of mandible?
gravity
anterior belly of digastric
mylohyoid
lateral pterygoid mm
What allows lateral movements of mandible?
ispsilateral temporalis and masseter
contralateral medial pterygoid
What performs protrusion of the mandible?
lateral pterygoid
What allows retraction of the mandible?
temporalis
Author
brau2308
ID
160988
Card Set
Exam 3: Masseteric, Temporal and Infratemporal Regions
Description
review of 7/3 lecture on masseteric, temporal, and infratemporal regions
Updated
7/4/2012, 8:25:42 PM
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