Infratemporal Fossa Flashcards
parotid plexus nerves are branches of which cranial nerve?
VII
where does CN VII exit the skull?
stylomastoid foramen
what are the names of the 5 branches of the parotid plexus?
Temporal
Zygomatic
Buccal
Marginal Mandibular
Cervical
what is the function of the nerves of the parotid plexus?
motor to muscles of facial expression
what are the boundaries of the temporal fossa?
- post/sup: temporal lines
- ant: frontal & zygomatic bones
- lat: zygomatic arch
- inf: infratemporal crest
what is the lateral boundary of the infratemporal region?
ramus of mandible
what is the medial boundary of the infratemporal region?
lateral pterygoid plate
what is the anterior boundary of the infratemporal region?
posterior aspect of maxilla
what is the posterior boundary of the infratemporal region?
tympanic portion, mastoid process, styloid process
what is the superior boundary of the infratemporal region?
inferior surface of greater wing of sphenoid
what is the inferior boundary of the infratemporal region?
medial pterygoid attachment near mandibular angle
name the contents of the infratemporal fossa
- inferior temporalis m
- lateral & medial pterygoid mm
- pterygoid venous plexus
- maxillary a & branches
- Mandibular V3 nn
- chorda tympani
- otic ganglion
what joint is part of the infratemporal fossa?
temporomandibular joint
name the 4 mandibular (V3) nerves
auriculotemporal
inferior alveolar
lingual
buccal
name the primary muscles of mastication
- temporalis
- masseter
- lateral pterygoid
- medial pterygoid
attachments of temporalis
- superior temporal line
- coronoid process of mandible
what nerve innervates temporalis?
CN V3 (deep temporal n)
actions of temporalis
- elevate mandible (close jaw)
- retrude chin
- lateral movements
attachments of masseter
- zygomatic bone/arch
- angle & ramus of mandible
what nerve innervates masseter?
CN V3 (n to masseter)
actions of masseter
- elevate mandible (close jaw)
- protrude chin
- retrude chin
- lateral movements
attachments of lateral pterygoid
O: infratemporal surface & greater wing of sphenoid; lat. surface of lat. pterygoid plate
I: TMJ capsule & disc, condyle of mandible
innervation of lateral pterygoid
CN V3 (lateral pterygoid n)
actions of lateral pterygoid
- BL: protract mandible, depress chin
- unilat: swing jaw to contra side
- larger lateral chewing movements
attachments of medial pterygoid
O: med. surface of lat. pterygoid plate & pyramidal process of palatine bone & tuberosity of maxilla
I: medial surface of mandible inf to mandibular foramen
innervation of medial pterygoid
CN V3 (medial pterygoid n)
actions of medial pterygoid
- with masseter, elevates mandible
- protrusion
- smaller grinding movements
what is the only muscle that depresses the chin (opens jaw)?
lateral pterygoid
what 3 muscle groups are accessory muscles of mastication?
suprahyoid
infrahyoid
mm of facial expression
action of infrahyoid muscles during mastication
fix or depress hyoid bone
name the components of the temporomandibular joint
- mandibular fossa of temporal bone
- head (condylar process) of mandible
- articular disc
- stylomandibular lig
- sphenomandibular lig
what muscle attaches to the articular disc of the TMJ?
lateral pterygoid
the pterygoid venous plexus is between what 2 muscles?
temporalis
lateral pterygoid
the pterygoid venous plexus anastomoses with…
- facial v -> cavernous sinus
- maxillary v
facial vein drains into what vessel?
common facial v (into internal jugular v)
maxillary artery is a terminal branch of ____
external carotid a
name the 3 parts of the maxillary artery
- mandibular
- pterygoid
- pterygo-palatine
describe the location of the mandibular part of the maxillary artery
horizontal along lower border of lateral pterygoid & deep (medial) to condylar process of mandible
name the branches of the mandibular part of the maxillary artery
- deep auricular a
- anterior tympanic a
- middle meningeal a
- inferior alveolar a
describe the location of the pterygoid part of the maxillary artery
ascends adjacent (superficial OR deep) to lateral pterygoid m
name the branches of the pterygoid part of the maxillary artery
- artery to masseter
- deep temporal aa
- pterygoid aa
- buccal a
describe the location of the pterygo-palatine part of the maxillary artery
through pterygomaxillary fissure into pterygopalatine fossa
name the branches of the pterygo-palatine part of the maxillary artery
- descending palatine
- superior alveolar (posterior, middle, anterior)
- infraorbital
- sphenopalatine
where does the mandibular nerve (V3) exit the skull?
foramen ovale into infratemporal fossa
what nerve runs with the inferior alveolar artery?
inferior alveolar n
what nerve encircles the middle meningeal artery?
auriculotemporal n
the auriculotemporal nerve supplies sensation to what areas?
auricle
temporal region
TMJ
the auriculotemporal nerve carries postganglionic ____ fibers from the ____ ganglion to the ____
- parasympathetic
- otic (IX)
- parotid gland
the inferior alveolar nerve gives off what nerve before entering the mandibular foramen?
n to mylohyoid
inferior alveolar nerve provides sensory to the ____
lower teeth
what is the terminal branch of the inferior alveolar nerve?
mental n
the lingual nerve is located anterior to what nerve?
inferior alveolar
what is the function of the lingual nerve on its own?
sensory to ant 2/3 of tongue, floor of mouth, lingual gingivae
what is the function of lingual nerve and chorda tympani?
- taste to anterior 2/3 of tongue
- preganglionic parasympathetic fibers to submandibular and sublingual salivary glands
buccal n function
sensory to cheek
the mandibular nerve (V3) gives off motor nerves to what muscles?
masseter
tensor veli palatini
medial pterygoid
lateral pterygoid
temporalis
