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 - 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)

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