Temporal region Flashcards
infratemporal fossa is located:
deep and inferior to zygomatic arch, deep to the ramus of the mandible, and posterior to the maxilla
contents of the infratemporal fossa:
inferior part of temporalis muscle, lateral and medial pterygoids, maxillary artery, pterygoid venous plexus, mandibular, inferior alveolar, lingual, buccal, and chorda tympani nerves, and otic ganglion
what type of joint is TMJ?
modified hinge synovial
TMJ is formed between the:
mandibular condyle and the mandibular fossa and articular tubercle of temporal bone
lower part of TMJ allows:
mainly hinge-like depression and elevation
upper part of TMJ allows:
protrusion and retraction
lateral ligament of TMJ:
strengthens joint laterally
sphenomandibular ligament of TMJ:
primary passive support of the mandible
stylomandibular ligament of TMJ:
does not contribute significantly to the strength of the joint
temporalis attachments:
floor of temporal fossa to coronoid process of mandible
innervation of temporalis
mandibular nerve
temporalis action
elevation and retraction of mandible
masseter attachments
zygomatic arch to angle and lateral surface of ramus of mandible
innervation of masseter
mandibular nerve
action of masseter
elevate mandible and contribute to protrusion
lateral pterygoid attachments
superior head- inframtemporal surface of sphenoid to joint capsule and articular disc of TMJ; inferior head- lateral surface of lateral pterygoid plate to anteromedial aspect of mandibular condyle
lateral pterygoid innervation
mandibular nerve
lateral pterygoid action
bilaterally- protracts mandible and depresses chin; unilateral- swings jaw to CL side
medial pterygoid attachments
superficial head- medial surface of lateral pterygoid plate to medial surface of mandibular ramus; deep head- posterior maxilla to medial surface of mandibular ramus
medial pterygoid innervation
mandibular nerve
medial pterygoid action
elevates mandible and contributes to protrusion
protrusion of TMJ is caused by:
lateral pterygoid, assisted by medial pterygoid and superficial head of masseter
retraction of TMJ is caused by:
posterior fibers of temporalis, deep part of masseter, and geniohyoid and digastric
elevation of TMJ is caused by:
temporalis, masseter, and medial pterygoid
depression of TMJ is caused by:
gravity, lateral pterygoid, digastric, geniohyoid, and mylohyoid
during yawning or taking a large bite, excessive contraction of what muscle can cause the head of the mandible to dislocate anteriorly:
lateral pterygoids
larger terminal branch of ECA:
maxillary artery
maxillary artery supplies blood for:
nasal cavity, lateral wall and roof of oral cavity, all teeth, and dura mater
three parts of maxillary artery:
mandibular, pterygoid, and pterygopalatine
mandibular/part 1 of maxillary artery:
middle meningeal and inferior alveolar arteries
pterygoid/part 2 of maxillary artery:
deep temporal, pterygoid, masseteric, and buccal arteries
middle meningeal artery supplies:
dura mater
middle meningeal artery enters cranial cavity through the:
foramen spinosum
an extradural hematoma is caused by:
a lateral blow to the head causing the middle meningeal artery to leak blood separating the dura from the bone
pterygoid venous plexus is located between the:
temporalis and pterygoid muscles
most veins accompanying branches of maxillary artery drain into:
pterygoid venous plexus
pterygoid venous plexus anastomoses with:
facial vein and cavernous sinus
mandibular nerve branches:
meningeal, nerve to medial pterygoid, branch to tensor tympani, and branch to tensor veli palatini
anterior trunk of mandibular nerve:
buccal, masseteric, deep temporal, and nerve to lateral pterygoid
posterior trunk of mandibular nerve:
auriculotemporal, lingual, and inferior alveolar nerve
in the infratemporal fossa, branches of CN V3 are joined by:
branches from CN VII and IX
chorda tympani branch of facial nerve
joins the lingual nerve and conveys fibers to submandibular ganglion which gives off fibers to the salivary glands
lesser petrosal nerve of glosspharyngeal nerve
carries fibers to otic ganglion which then travel via auriculotemporal nerve to parotid nerve
walls pterygopalatine fossa are formed from:
maxilla (anterior wall), palatine (medial wall), and sphenoid (posterior wall and roof)
contents of pterygopalatine fossa
3rd part of maxillary artery and branches, accompanying veins, maxillary nerve, pterygopalatine ganglion
3rd part of maxillary artery:
posterior superior alveolar, infraorbital, descending palatine, pharyngeal branch, artery of pterygoid canal, and sphenopalatine artery
infraorbital nerve gives off what 2 nerves?
middle superior alveolar and anterior superior alveolar nerves
infraorbital nerve is a branch of:
maxillary nerve
maxillary nerve gives off what branches within the pterygopalatine fossa?
zygomatic, posterior superior alveolar, and 2 ganglionic branches
zygomatic nerve enters orbit via:
IOF
zygomatic nerve divides into:
zygomaticotemporal and zygomaticofacial nerves
zygomaticotemporal nerve supplies:
skin over temple
zygomaticofacial nerve supplies:
skin over zygomatic bone
posterior superior alveolar nerve supplies:
maxillary molar teeth, buccal gingivae, and maxillary sinus
nerve of the pterygoid canal is formed by union of:
greater petrosal and deep petrosal nerves
greater petrosal nerve carries PSN fibers to:
all glands above oral fissure
deep petrosal nerve carries fibers mainly to:
blood vessels
