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TMJ + INFRATEMPORAL FOSSA - Coggle Diagram
TMJ + INFRATEMPORAL FOSSA
temporal fossa - bounded by temporal lines on each side of skull
contents
temporalis m. (superior) + temporal fascia
deep temporal n. (V3)
auriculotemporal n.
superficial temporal a./v.
infratemporal fossa - deep to zygomatic arch
contents
temporalis m. (inferior)
maxillary a. + branches
CN V3 mandibular n.
Sensory branches
auriculotemporal n.
wraps around middle meningeal a.
general sensory to large area over temple
carries post ganglionic parasympathetic otic ganglion -> parotid gland
lingual n.
2/3 general sensation anterior 2/3 tongue
joins with chorda tympani
inferior alveolar n.
n. to mylohyoid - before exiting mandibular foramen.
motor
to anterior digastric and mylohyoid mm.
mental n. - exits mental foramen, sensory to lower lip and chin
buccal n. - sensory to oral cavity/some skin
Motor branches
Deep temporal nn. - temporalis m.
N. to lateral pterygoid m.
N. to medial pterygoid m.
N. to mylohyoid
ganglia (CN) -
COPS 3977
ciliary (III)
otic (IX) - psns to parotid, infratemporal fossa
pterygopalantine (VII)
submandibular (VII)
chorda tympani (CN VII)
facial n. -> middle ear -> infratemporal fossa
special visceral afferent to anterior 2/3 tongue
presynaptic PSNS nn. superior salivatory nucleus --> submandibular ganlgion
otic ganglion
pterygoid venous plexus
drains orbit, cavernous sinus, nasal cavity, teeth, nasopharynx
pterygopalatine fossa - deep to the infratemporal fossa and posterior to the maxilla bilaterally
connected to
orbit via inferior orbital fissures
nasal cavity via sphenopalantine foramen
oral cavity via greater palantine canal
middle cranial fossa via foramen rotundum
infratemporal fossa via pterygomaxillary fissure
contents
V2 maxillary + branches
infraorbital n.
posterior superior alveolar n.
zygomatic n.
nasopalantine n.
Temporomandibular joint (TMJ)
Articulation of condylar process of mandible + mandibular foramen of sphenoid bone
Joint comprised of upper joint cavity + articular disc + inferior joing cavity
During mastication, superior articulation
translates
, inferior articulation
rotates
Associated structures
lateral + medial pterygoid mm.
Ligaments - support movement and neurovascular of joint
sphenomandibular - spine of sphenoid to lingula of mandible
stylomandibular - styloid process of temporal bone to angle of mandible
Many clinically relevant dysfunctions exist
maxillary artery
branch of external carotid a.
begins posterior and deep to neck of mandible
Three parts
1 - deep to mandible
middle meningeal a.
inferior alveolar a.
2- superficial
or
deep (~40%) to lateral pterygoid m.
deep temporal aa. supplies mastication mm. and deep cheek.
masseteric aa.
buccal a.
pterygoid aa.
3 - enters pterygomaxillary fissure into pterygopalantine fossa
posterior superior alveolar a.
infra-orbital a.
sphenopalantine a.