Temporal and Infratemporal Flashcards
muscles of mastication
- formed embryologically from…
- innervated by…
- difference compared to facial nerve in terms of embryological development and innervatiouin
formed from 1st branchial arch innervated by mandibular division (V3) of trigeminal nerve facial expressionj -develop from 2nd branchial arch -innervated by facial nerve
muscles of mastication names
temporalis
masseter
lateral pterygoid
madial pterygoid
temporal fossa
- layman’s name
- boundaries
- roof
the temple temporal lines (formed by borders of origin of temporalis muscle) frontal bone zygomatic bones roof -temporal fascia over the muscle
temporal fascia
-splits into…
superficial part
-attached to zygomatic arch
deep part
-continuous with deep fascia of masseter
temporal fossa floor
formed by the articulations of the squamous part of the
- temporal bone
- frontal bone
- parietal bone
- greater wing of the sphenoid
what is the pterion
-what crosses over it?
area of articulation of the temporal bone, frontal bone, parietal bone, and greater wing of sphenoid
middle meningeal artery crosses over it within the cranial cavity
when is the middle meningeal artery at risk
lateral head injuries
temporal fossa contents
temporalis muscle superficial temporal artery (over temporalis muscle; one of two terminal branches of external carotid artery) auriculotemporal nerve (over muscle)
auriculotemporal nerve
- function
- location
sensory to the temporal region
originates in the infratemporal fossa as a branch of V3
emerges anterior to the auricle from deep to the parotid gland
infratemporal fossa
-location
inferior and deep to the zygomatic arch and posterior to the mandible
infratempral fossa
-borders
lateral wall -ramus of mandible medial wall -lateral pterygoid plate anterior wall -infratemporal surface of maxilla posterior wall -condylar process of mandible -styloid process of temporal bone roof -inferior surface of greater wing of sphenoid bone floor -level where medial pterygoid attaches to angle/ramus of mandible
foraminae of the infratemporal fossa
-contents in each
foramen ovale
-mandibular division of trigeminal nerve
foramen spinosum
-middle meningeal artery
primary nerve of the infratemporal fossa
mandibular division (V3) of trigeminal nerve exits foramen ovale as mandibular nerve and then branches in many named nerves
branches of V3 of trigeminal nerve
auriculotemporal inferior alveolar lingual buccal named muscular branches for each muscle of mastication
auriculotemporal nerve
-function
sensory to around the ear
carries glossopharyngeal fibers to the parotid [gland]
production of saliva
inferior alveolar nerve
-function
sensory to the
- teeth of the mandible
- skin overlying the chin and mandible
lingual nerve
- function
- chorda tympani function
somatosensation to the anterior 2/3 of the tongue
chorda tympani
-branch of facial nerve that joint lingual to carry taste from anterior 2/3 of the tongue
buccal nerve
-function
sensation over cheek
vessels of the infratemporal fossa
maxillary artery
- terminal branch of external carotid
- number of branches that are described with respect to their position to the lateral pterygoid
- middle meningeal and inferior alveolar are most important and easiest to find during dissection
pterygopalatine fossa
- continuous medially…
- continuous anteriorly…
- continuous posteriorly…
- continuous medially…
- lies between
continuous medially from infratemporal fossa through pterygomaxillary fissure
continuous anteriorly with the orbit through the inferior orbital fissure
continuous posteriorly with middle cranial fossa through foramen rotundum
continuous medially with nasal cavity through the sphenopalatine foramen
lies between
-sphenoid bone posteriorly
-maxilla anteriorly
pterygopalatine fossa contents
foramina -foramen rotundum -inferior orbital fissure nerves -maxillary division of V2 branches into infraorbital nerve carrying sensation from the skin overlying the maxillary and zygomatic regions vessels -maxillary artery branches -infraorbital artery
temporomandibular joint
- type of joint
- components
modified synovial hinge joint
components
-head of condyle of mandible
-mandibular fossa with articular tubercle
-articular disc within joint that is fused with articular capsule
TMJ articular capsule
- thickened _____ as the _____
- other ligaments that support the connection of the mandible to the base of the skull
thickened laterally as the lateral temporomandibular ligament (strong ligament of the capsule
other ligaments
-stylomandibular (styloid process of the temporal bone)
-sphenomandibular (spine of sphenoid bone)
TMJ movements
rotation during the initial part of jaw opening
-head of mandible rotates with articular disc toward articular tubercle
