Temporal%20fossa

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Temporal fossa Infratemporal fossa Muscles of
mastication
Kritchai Bespinyowong
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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
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Temporal fascia
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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
process Roof - infratemporal surface of
greater wing of sphenoid bone and
squamous part of temporal bone
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Infratemporal fossa
Route cranial cavity orbit in
fratemporal fossa pterygopalatine fossa
Foramen ovale Foramen spinosum
Inferior orbital fissure
Pterygomaxillary fissure
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Infratemporal fossa
Contents 1. Medial Lateral pterygoid
muscle 2. Maxillary artery 3. Pterygoid venous
plexus 4. Mandibular nerve 5. Chorda tympani 6.
Otic ganglion
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Muscles of mastication
Masseter muscle Temporalis muscle Medial
pterygoid muscle Lateral pterygoid muscle
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Masseter muscle
Origin superficial portion - lower border of
ant. 2/3 of zygomatic arch deep portion -
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
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Masseter muscle
Nerve supply Nerve to masseter Action -
elevation (bilateral) - retrusion
(bilateral) - ipsilateral excursion
(unilateral)
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Tempolaris muscle
Origin 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
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Temporalis muscle
Nerve supply deep temporal branch
of mandibular nerve Action - resting tonus
(bilateral) - elevation (bilateral) -
retrusion (bilateral) - ipsilateral excursion
(unilateral)
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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
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Medial pterygoid muscle
Nerve supply nerve to medial pterygoid Action
- elevation (bilateral) - protrusion
(bilateral) - contralateral excursion
(unilateral)
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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
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Lateral pterygoid muscle
Nerve supply nerve to lateral pterygoid Action
- protrusion (bilateral) - depression
(bilateral) - contralateral excursion
(unilateral)
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