Week 7: temporal & infra-temporal region, TMJ, MoM Flashcards
osteology of the mandible - key components
condylar process/ condyle
coronoid process (head and neck)
mandibular notch
neck
ramus
angle
body
how does the mandible articulate with the skull
via the mandibular fossa of the temporal bone
what forms the TMJ
Mandibular fossa of temporal bone
condylar process of mandible
articular disc
what type of joint is the TMJ
Modified hinge (atypical) synovial joint
- has joint capsule
what type of cartilage is in the TMJ
Articular surfaces of bone covered with fibrocartilage (not hyaline cartilage)
what 3 ligaments connect the mandible to the temporal bone
2 extrinsic
- sphenomandibular (connects to the lingula)
- stylomandibular ligaments (connects to angle)
1 intrinsic (joint and capsule) - lateral ligament
what muscles are involved in the DEPRESSION of the mandible
lateral pterygoid
supra + infrahyoid muscles
what muscles are involved in the ELEVATION of the mandible
temporalis
masseter
medial pterygoid
what muscles are involved in the PROTRUSION of the mandible
lateral pterygoid
medial pterygoid
masseter
what muscles are involved in the RETRUSION of the mandible
temporalis
what muscles are involved in the LATERAL MOVEMENTS of the mandible
Temporalis of same side
pterygoids of opposite side
masseter
what are the muscles of mastication
temporal
medial and lateral pterygoid
masseter
MoM are derived from which embryonic arch
1st pharyngeal arch
what nerves supplies the MoM
Trigeminal nerve mandibular division (CNV3)
temporalis origin and insertion, innervation
O: temporal fossa
I: medial surface of coronoid process of mandible + anterior border of ramus of mandible
deep temporal nerves from anterior trunk of CN V3
masseter origin and insertion, innervation
O: zygomatic arch
I: angle & lateral surface of ramus of mandible
masseteric nerve from anterior trunk of CN V3
medial pterygoid origin and insertion, innervation
O:
deep head -medial surface of lateral pterygoid plate
superficial head - the pyramidal process of the palatine bone
I: medial surface of the ramus & angle of mandible
medial pterygoid branch from main trunk of CN V3
lateral pterygoid origin and insertion, innervation
O:
upper head - infratemporal surface of greater wing of sphenoid bone
lower head - lateral surface of lateral pterygoid plate
I: onto the articular disc and fibrous capsule of the TMJ
lateral pterygoid & buccal nerve from anterior trunk of CN V3
boundaries of the temporal fossa
Superior & posterior borders - Superior & inferior temporallines
Anterior border - Frontalprocess of zygomatic bone &zygomatic process of frontalbone
Inferior border - Infratemporalcrest deep to zygomatic arch
Floor - frontal, parietal, temporal & greater wing of sphenoid bone.Includespterion
boundaries of the infratemporal fossa
Laterally: Ramus of the mandible
Medially: Lateral pterygoid plate of sphenoid bone
Anteriorly: Posterior aspect of maxilla
Posteriorly: Tympanic plate, mastoid & styloid processes
Superiorly: Infratemporal crest of sphenoid bone
Inferiorly: Angle of the mandible
contents of the temporal fossa
Muscles - temporalis + fascia
Vessles - superficial, middle & deep temporal arteries and veins
Nerves -
deep temporal nerves
zygomaticotemporal nerves (CNV2)
auriculotemporal nerve (from CNV3)
temporal branch of facial nerve (CNVII)
contents of the infratemporal fossa
Muscles: inferior part of the temporalis muscle;lateral and medial pterygoid muscles
Blood vessels: maxillary artery; pterygoid venous plexus
Nerves: mandibular, inferior alveolar, lingual, buccal, and chorda tympani nerves & oticganglion
contents of the pterygopalatine fossa
maxillary nerve [V2]
pterygopalatine ganglion
terminal part of the maxillary artery
veins, as well as their associated branches.
describe origin + branches of CNV3 (mandibular branch of trigeminal)
Arises from trigeminal ganglion in middle cranial fossa
exits foramen ovale
Branches:
Auriculotemporal n.
Inferior alveloar n.
Lingual nerve
Buccal nerve
