View
291
Download
9
Category
Tags:
Preview:
Citation preview
Temporal fossa
Boundaries :
Above & behind - superior temporal line Anterior wall - zygomatic bone
- zygomatic process of frontal bone- greater wing of sphenoid bone
Medial wall - parietal bone, frontal bone,
squamous part of temporal bone, greater wing of sphenoid bone
Inferior - infratemporal crest
Infratemporal fossa
Boundaries :
Anterior wall - posterior surface of maxilla- maxillary tuberosity
Medial wall - lateral pterygoid plate
- pyramidal process of palatine bone Lateral wall - inner surface of zygomatic arch
- ramus and coronoid processRoof - infratemporal surface of greater
wing of sphenoid bone and squamous part of temporal bone
Infratemporal fossa
Route :
cranial cavity orbit
infratemporal fossa
pterygopalatine fossa
Foramen ovale Foramen spinosum Inferior orbital fissure
Pterygomaxillary fissure
Infratemporal fossa
Contents :
1 . Medial & Lateral pterygoid muscle 2. Maxillary artery 3 . Pterygoid venous plexus 4 . Mandibular nerve 5 . Chorda tympani 6 . Otic ganglion
Muscles of mastication
Masseter muscle Temporalis muscle
Medial pterygoid muscle Lateral pterygoid muscle
Masseter muscleOOOOOO :
superficial portion - lower border of ant. 2/3 of zygomatic arch
OOOO OOOOOOO - lower border of post. 1/3 of zygomatic arch
- medial surface of zygomatic arch
Insertion : lateral surface of mandible extend froO
basal part of coronoid process to angle of mandible
Masseter muscle
O OOOO OOOOOO : Nerve to masseter
Action : - elevation (bilateral)- retrusion (bilateral)
- ipsilateral excursion (unilateral)
Tempolaris muscle
OOOOOO : floor of temporal fossa
Insertion : medial surface, apex, anterior and posterior border of coronoid process
superficial tendon - anterior border of coronoid process
deep tendon - internal oblique line
Temporalis muscle
Nerve supply : deep temporal branch of mandibular nerve
Action : - resting tonus (bilateral)- elevation (bilateral)- retrusion (bilateral)
- ipsilateral excursion (unilateral)
Medial pterygoid muscle
OOOOOO : superficial head - maxillary tuberosity
- lateral surface of pyramidal process of palatine bone
deep head - pterygoid fossa- medial surface of lateral pterygoid plate
Insertion : medial surface of mandibular angle
Medial pterygoid muscle
Nerve supply : nerve to medial pterygoid
Action : - elevation (bilateral)- protrusion (bilateral)
- contralateral excursion (unilateral)
Lateral pterygoid muscle
OOOOOO : - upper head infratemporal surface and
infratemporal crest of greater wing of sphenoid bone
lower head - lateral surface of lateral pterygoid plate
Insertion : - anteromedial surface of articular capsule- anterior border of articular disc- anterior surface of mandibular neck
Lateral pterygoid muscle
Nerve supply : nerve to lateral pterygoid
Action : - protrusion (bilateral)- depression (bilateral)
- contralateral excursion (unilateral)
Recommended