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42 Cards in this Set
- Front
- Back
boundaries of infratemporal region
Roof (how does it communicate above?) Lateral Medial Anterior Posterior Inferior |
Roof: gap between zygomatic arch and infratemporal crest, and sphenoid bone medial to infratemporal crest; communicates above with temporal fossa
Lateral: ramus of mandible Medial: lateral pterygoid plate and wall of pharynx Anterior: maxilla Posterior: Condyle, styloid process, carotid sheath Inferior: open to neck and submandibular region |
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principal contents of the infratemporal fossa
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medial and lateral pterygoid muscles, maxillary artery and branches of CN V3
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foramina & fissures associated with the ITF
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ovale
spinosum posterior superior alveolar mandibular inferior orbital, pterygomaxillary fissures |
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branches of the 1st part of the maxillary artery- from external carotid to inferior border of lateral pterygoid
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- anterior tympanic a.
- deep auricular a. - inferior alveolar a. - middle meningeal a. - accessory meningeal a. |
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branches of the 2nd part of the maxillary artery- lies on or deep to lateral pterygoid m.
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- deep temporal aa. (2)
- masseteric aa. - pterygoid a. - buccal a. |
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branches of the 3rd party of the maxillary artery- after entering pterygomaxillary fissure
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- posterior superior alveolar aa.
- others... |
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maxillary vein is located between these 2 muscles
collects blood from what? |
temporalis and pterygoid muscles
pterygoid plexus |
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the maxillary vein communicates with the facial vein and cavernous sinus in the cranium through what 2 foramen
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foramen ovale and foramen lacerum
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maxillary vein combines with ___________ to form ______________
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superficial temporal vein
form retromandibular vein |
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mandibular nerve distributes motor and sensory to these 5 areas
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- lower teeth & gums
- skin on temporal region, auricle, lower lip and lower face - mucous membrane of the floor of the mouth - anterior tongue - masticatory muscles |
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mandibular nerve gives motor branches to these muscles
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anterior belly of digastric
mylohyoid masseter temporalis medial pterygoid lateral pterygoid tensor tympani tensor veli palatini |
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mandibular nerve gives these sensory branches
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1. buccal nerve
2. lingual nerve 3. inferior alveolar nerve 4. auriculotemporal nerve |
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buccal nerve
- emerges ___________ - sensory to skin over ________ and ______, _____________ |
between inferior and superior lateral pterygoid muscles
sensory to skin over buccinator & oral mucosa |
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lingual nerve
- emerges _____ to the _____ head of lateral pterygoid m. - provides sensory to these 3 things |
inferior to inferior head
to muscosa of anterior 2/3 of tongue floor of mouth lingual gingival |
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inferior alveolar nerve enters the mandible at the ________
- gives sensory to ________ - gives off these 3 nerves |
mandibular foramen
lower teeth gives off mental nerve, incisive nerve, nerve to mylohyoid |
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the mental nerve gives sensory to :
incisive nerve gives sensory to: |
- skin overlying chin, lower lip, adjacent gingiva, mucosa of lower lip
- premolars, canines, incisors |
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the auriculotemporal nerve:
- 2 roots that pass around the __________ artery before joining together - sensory to part of ____, ____ and ____ - travels _____ to external auditory meatus and then upward across the _________ to be distributed with branches of the ___________ artery |
- middle meningeal artery
- sensory to part of ear and scalp, TMJ - anterior to external auditory, upward across the zygomatic arch in front of the ear with superficial temporal artery |
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the posterior superior alveolar nerve is a branch of ______
-provides sensory to _______ - enters through PSA foramina in the ______ |
maxillary division CN V2
- upper molar teeth - in maxilla |
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CN VII preganglionic fibers travel as this nerve _____ which synapses in the ______ ganglion then goes to these 2 glands and conveys taste from ______ 2/3 of tongue
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chorda tympani n.
submandibular ganglion sublingual, submandibular gland taste 2 anterior tongue 2/3 |
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chorda tympani n enters infratempora fossa via ______ located immpediately ________(ant/post) to this structure:
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petrotypanic fissue
posterior to the tegmen tympani |
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hitchhikes on the lingual nerve
auriculotemporal nerve? |
- chorda tympani (CN VII)
- parasympathetics from IX |
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parasympathetics from IX innervate what gland?
associated ganglion and located ____ to CN V3 just below ___________ |
parotid gland
otic ganglion lcoated medial to CN v3 just below the foramen ovale |
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3 components of preganglionic CNIX and 2 postganglionic
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glossopharyngeal nerve (CN IX)
tympanic plexus lesser petrosal nerve otic ganglion auriculotemporal nerve hitch hike |
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sympathetic component of CNIX stimulates these 2 things
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vasoconstriction and salivation (parotid duct)
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2 reasons ITF is important for dentist
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mandibular block injection site
tumors resulting in xerostomia, other deficits in orosensory function |
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4 notable characteristics of the TMJ
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joint articular surfaces covered with fibrous connective tissue
cartilage deep to fibrous CT differs functionally from other growth or articular cartilages complexity of motion (combo of translation & rotation) synovial joint subdivided into 2 compartments by an articular disc |
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4 bony components of the temporal bone associated with the TMJ
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mandibular fossa
articular tubercle articular eminence postglenoid tubercle/spine |
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3 functions of synovial membrane of TMJ
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- production of synovial fluid
- phagocytosis - rapid diffusion |
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attachments of articular disc
medial & lateral: posterior wall of capsule: anterior wall of capsule: |
- medial and lateral poles of condyle via discal ligaments
- posterior wall of joint capsule via retrodiscal pad - anterior wall of joint capsule & superor head of lateral pterygoid muscle |
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where does the inferior lamina attach and what kind of fibers?
superior lamina attachment and fibers? |
inferior: collagenous fibers attaching to posterior ocndylar neck
superior: collagenous fibers+ elastic fibers attaches to tympanic plate and mandibular fossa |
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- lateral ligament of TMJ aka:
-thickening of: - runs from ________ of condyle and ________ to ____________ - limits this movement: |
temporomandibular ligament
thickening of lateral wall runs from lateral pole of condyle and condylar neck to articular tubercle limits retrusive movements of the mandible |
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sphenomandibular ligament runs from ________ of sphenoid to _________ of mandible
what else is special about it |
spine of sphenoid to lingula of mandible
embryological remnant of meckel's cartilage |
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stylomandibular ligament runs from _______ to _______
thickened part of deep lamina of what fascia |
- runs from styloid process to mandibular angle
- thickened part of deep lamina of parotidomasseteric fascia |
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attach articular disc to lateral and medial poles of the condyle
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discal ligaments
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function of inferior head of lateral pterygoid
superior head of lateral pterygoid |
- jaw opening (downward and forward pull)
- jaw closing to stabilize disc movement (upward and forward pull) |
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innervation to TMJ
blood supply to TMJ |
auriculotemporal nerve (posterolateral) masseteric (anteromedial)
maxillary artery (deeper portion) and the superficial temporal artery |
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movement that occurs in superior joint compartment
inferior joint compartment |
translation (gliding)
rotation (hinge) |
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occurs in internal derangements of the TMJ
2 types? |
anterior disc displacement
"reducing" disc displacements (will return to normal if joint is disarticulated and disc can be recaptured) "non-reducing" disc displacement. (no response to therapy) |
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when disc of TMJ becomes distorted into a ball or knot anterior to the condyle, thereby greatly hindering anterior translation of condyle during opening
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deformed disks/ closed lock
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can cause disk perforations and where do they typically occur?
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- retrodiscal tissue trapped between condyle and articular eminence
- usually in bilaminar zone |
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microtraumas can cause _______ in the articular disk, what can be used to detect them?
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adhesions
arthroscopy |
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3 kinds of degenerative diseases of the TMJ
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- osteoarthritis
- rheumatoid arthritis - ankylosis |