Infratemporal fossa structure

structure related to infra temporal structure

1. INFRATEMPORAL FOSSA STRUCTURE
Instructor : Dr. IbtihagSiddigStudent name : FatemahIbrahim 201608350

2. CONTENTS
Introduction 01
Boundaries 02
Contents 04
Blood supply 05
Innervation 0603 COMMUNICATIONS

3. Theinfratemporalfossaisthespacebeneath.Thebaseoftheskull,betweenthesidewallofthepharynxandramusofthemandible.Itcommunicateswiththetemporalfossathroughagapdeeptothezygomaticarch.Itisalsoreferredtoastheparapharyngealspaceorlateralpharyngealspace.
INTRODUCTION 01

4. Boundaries
02

5. Boundaries
02
Roof: Formed by the infratemporal surface of the greater wing of the sphenoid. It is pierced by foramen spinosum and foramen ovale.
Medial wall: Formed by lateral surface of the lateral pterygoid plate of the sphenoid. It is separated from the anterior wall by pterygomaxillary fissure.
Lateral wall: Formed by the ramus of the mandible.
Anterior wall: Formed by the infratemporal surface of the maxilla. It is separated from roof by
inferior orbital fissure.
Floor: Open and extends up to the level of the base of the mandible.
Posterior wall: Formed by styloid process of the temporal bone.

6. COMMUNICATIONS 03

7. CONTENTS 04
1.Muscles: Lateral pterygoid, medial pterygoid, and tendon of temporalis. 2.Blood vessels:Maxillary artery, maxillary vein, and pterygoid venous plexus. 3.Neural structures:Mandibular nerve, chorda tympani nerve, and oticganglion.

8. MUSCLESLATERAL PTERYGOID
Itisashort,thickconicalmusclewithitsapexpointingbackwards.Itpassesbackwardsand
slightlylaterallyfromtheroofandmedial
wallofthefossatotheneckofthemandible.

9. •Relations
Structures emerging at the upper border: •Deep temporal nerves (two in number)•Masseteric nerve.
Structures emerging at the lower border: •Inferior alveolar nerve and artery. •Lingual nerve.
•Middle meningeal artery

10. MUSCLESMEDIAL PTERYGOID
•The medial pterygoid is a thick quadrilateral muscle and consists of two heads: superficial and deep.
•The medial pterygoid is supplied by a nerve to medial pterygoid, a branch. from the main trunk of the mandibular nerve.

11. Superficial :
1.Lingual nerve. 2.Inferior alveolar nerve.
3.Inferior alveolar vessels.
Deep:
1.Levatorpalatiand tensor palatimuscles.
2.Superior constrictor of pharynx.
3.Styloglossus and stylopharyngeus muscles.
•Relations

12. BLOOD VESSELS
1.MAXILLARY ARTERY2.MAXILLARY VEIN 3.PTERYGOID VENOUS PLEXUS
NEURAL STRUCTURES
1.MANDIBULAR NERVE AND ITS BRANCHES2.CHORDA TYMPANI NERVE3.OTIC GANGLION.

13. Blood supply 05
Thevascularsupplyoftheinfrate-mporalfossacomessingularly
fromthemaxillaryartery.Thebrancheshavebeendividedintothreesectionsforclarityand
arecategorizedaccordingtotheanatomicalstructureclosest
tothem,including:
•mandibularpart
•thepterygoidpart•thepterygopalatinepart

14. The firstpart(mandibularpart)
contains severalarterialbranches, suchasthedeepauricular, theanteriortympanic,
themiddleand accessorymeningealarteriesand theinferioralveolarartery. The branchespassbetweenthemandibleand thesphenomandibularligament.
The secondpart(pterygoid part )
contains vessels that passobliquelyand anterosuperiorlybetweenthemandibular
ramusand thetemporalismuscle. The listof vascularconstituentsincludestheanteriorand posteriordeeptemporalartery, themassetericartery, thepterygoidarteryand the
buccalartery
The thirdpart(thepteryogopalatine)
holds theposteriorsuperioralveolararterythat runsfromtheinfratemporalfossatothepterygopalatinefossaviathepterygomaxillaryfissure.

15. MAXILLARY VEIN AND PTERYGOID VENOUS PLEXUS
It is a short venous trunk, which accompanies the first part of the maxillary artery.
•Pterygoid Venous Plexus
It is a network of very small veins that lie around and within the lateral pterygoid muscle.
•Maxillary Vein
whichleadsinfratempora
foggy
to
communicate
with
Cavernous
sinus

16. Innervation06
•The mandibular nerve contribute their branches.
•Mandibular nerveproviding nerves from both its an
terior and posterior divisions.

18. CHORDA TYMPANI NERVE
The chorda tympani nerve is the slender branch of
facial nerve.

19. OTIC GANGLION
It is a small parasympathetic ganglion connected to the mandibular division of trigeminal nerve
and provides a relay station to the secretomotor fibresto the parotid gland. Topographically , it is intimately related to the mandibular nerve but functionally it is related to glossopharyngeal nerve.

20. THANK YOU !

21. REFRENCES :