Temporal fossa Infratemporal fossa Muscles of mastication Kritchai

Temporal fossa Infratemporal fossa Muscles of mastication Kritchai Bespinyowong

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

Temporal fascia

Infratemporal fossa Boundaries: Anterior wall Medial wall Lateral wall Roof - posterior surface of maxilla -maxillary tuberosity - lateral pterygoid plate -pyramidal process of palatine bone - inner surface of zygomatic arch -ramus and coronoid process - infratemporal surface of greater wing of sphenoid bone and squamous part of temporal bone

Infratemporal fossa Route: cranial cavity Foramen ovale Foramen spinosum orbit Inferior orbital fissure infratemporal fossa Pterygomaxillary fissure pterygopalatine fossa

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 muscle Origin: superficial portion deep portion - lower border of ant. 2/3 of zygomatic arch - lower border of post. 1/3 of zygomatic arch -medial surface of zygomatic arch Insertion : lateral surface of mandible extend from basal part of coronoid process to angle of mandible

Masseter muscle Nerve supply : Nerve to masseter Action : - elevation (bilateral( -retrusion (bilateral( -ipsilateral excursion (unilateral(

Tempolaris muscle Origin : floor of temporal fossa Insertion : medial surface, apex, anterior and posterior border of coronoid process superficial tendon deep tendon - anterior border of coronoid process - internal oblique line

Temporalis muscle Nerve supply : Action : deep temporal branch of mandibular nerve - resting tonus (bilateral( -elevation (bilateral( -retrusion (bilateral( -ipsilateral excursion (unilateral(

Medial pterygoid muscle Origin: 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 Origin: 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(