Temporal & Infratemporal Fossae Flashcards
The temporal fossa contains….&….
Temporalis muscle & temporal fascia
Describe bounds of infratemporal fossa
Lat, ramus of mandible, med, lateral pterygoid plate, ant post surface of maxilla, post styloid process, sup, greater wing of sphenoid.
The infratemporal fossa communicates with middle cranial fossa through ….&…., and with orbit through…, and with pterygopalatine fossa through……
Foramen ovale & spinsum
Inferior orbital fissure
Pterygo-maxillary fissure
Mention superficial contents of infratemporal fossa
Lat & medial pterygoid muscles
Branches of mandibular nerve
Maxillary artery
Pterygoid venous plexus
Enumerate deep contents of infratemporal fossa
- Trunk of mandibular nerve & otic ganglion
- Tensor palate muscle
- Middle meningeal & accessory meningeal arts
- Chorda tympani nerve
- Spheno-mandibular ligament
Muscles of mastication develop from……
1st pharyngeal arch
Describe origin, instert. & nerve supply of temporalis
O, floor of temporal fossa and temporal fascia.
I, all aspects of the coronoid process ex lateral
N, two deep temporal nerves from ant division of mandibular nerve
Describe origin, instert. & nerve supply of masseter
O, superficial part: ant 2/3 of lower border of zygomatic arch. Deep from post third of lower and inner zygomatic arch
I, lateral surface of ramus of mandible
S, masseteric branch from ant division of mandibular
Describe origin, instert. & nerve supply of lateral pterygoid
O, upper head, infratemporal crest and surface of greater wing of sphenoid
Lower head, lateral surface of lateral pterygoid plate
I, fovea in front of the neck of mandible & capsule and articular disc of TMJ
S, pterygoid branch from ant division of mandibular nerve
Describe origin, instert. & nerve supply of medial pterygoid
O, superficial head from tuberosity of maxilla. Deep head from medial surface of lateral ptrlerygoid plate
I, medial surface of angle of mandible
S, branch from mandibilar trunk.
Brief the actions of temporalis & masseter
Both elevate the mandible (antigravity muscles), temporalis retracts the mandible while masseter protrudes it.
Brief the actions of lat & med pterygoid muscles
Lat: depresses mandible to open mouth & protrudes mandible with help of med ptrygoid.
Med: elevates mandible
When both act together produce side-to-side chewing movements
Mention the structures passing between 2 heads of lateral pterygoid
Buccal nerve
Maxillary artery
Lateral surface of lateral pterygoid is related to:
- Ramus of mandible
- Superficial head of medial ptergoid & tendon of temporalis
- Maxillary a. & pterygoid venous plexus
Medial surface of lateral pterygoid is related to:
M, deep head of medial pterygoid & tensor palati
A, middle meningeal & maxillary arteries
N, mandibukar nerve trunk, otic ganglion & chorda tympani
L, spheno-mandibular ligament
Type of joint of TMJ
Synovial-condylar
The upper surface of articular dics of cartilage is…..to fit……, while lower is…..to fit……
Concavo-convex, mandibular fossa & articular eminence
Concave, mandibular head
Temopro-mandibular ligament lies…..to joint capsule, limits…..movement & protects……
Lateral
Posterior
External auditory meatus
Stylo-mandibukar ligament lies ….to joint capsule, it separates ….from…..
Posterior
Parotid/submandibular gland
Spheno-mandibular ligament is attached to…..of mandible, lies….to joint capsule
Lingula of mandibular foramen
Medial
The depression of the mandible is AIDED by…..
Geniohyoid, digastric & mylohyoid
Describe blood & nerve supply of TMJ
Superficial temporal & maxillary arteries
Auriculotemporal & masseteric nerves
GR: Dislocation of TMJ occurs mostly in ant direction
- TMJ lies just ant to external auditory meatus
- The lateral temporomandibular ligament prevents backward dislocation of joint protecting external auditory meatus
Mention relations of mandibular trunk in infratemporal fossa
Med: tensor palati & otic ganglion
Lat: lateral pterygoid
Post: middle meningeal art
