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INFRATEMPORAL FOSSA Contents

INFRATEMPORAL FOSSA Contents Mandibular nerve Otic ganglion. M. ASIF BMLT., M.Sc(medical anatomy) Dept Of Anatomy. INFRATEMPORAL FOSSA.

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INFRATEMPORAL FOSSA Contents

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  1. INFRATEMPORAL FOSSA Contents Mandibular nerve Otic ganglion M. ASIF BMLT., M.Sc(medical anatomy) Dept Of Anatomy

  2. INFRATEMPORAL FOSSA • Region situated below the middle cranial fossa of the skull, intervenes between the pharynx and the ramus of the mandible

  3. BOUNDARIES • Anterior- maxilla • Posterior- styloid process • Medial- lateral pterygoid plate • Lateral- ramus & coronoid process • Above- Infratemporal surface of greater wing of sphenoid • Below- open

  4. COMMUNICATIONS • Infront- orbit through inferior orbital fissure • Medial- Pterygopalatine fossa through pterygopalatine fissure • Above & lateral- temporal fossa • Above & medial- middle cranial fossa through F. ovale & F. spinosum

  5. CONTENTS • Muscles- lateral & medial pterygoids, temporalis • Nerves- mandibular nerve & branches, chorda tympani nerve, Otic ganglion and connections • Vessels- maxillary artery & pterygoid venous plexus

  6. LATERAL PTERYGOID MUSCLE • key muscle • Origin- 2 heads Upper- sphenoid Lower- lateral pterygoid plate • Insertion-pterygoid fovea, capsule & articular disc of TMJ.

  7. LATERAL PTERYGOID • Nerve supply- anterior division of mandibular nerve • Actions- • Depression of mandible. • Protrusion of mandible - • Side- side chewing movements

  8. RELATIONS • Superficial – • maxillary artery • Tendon of temporalis • Ramus of mandible • Masseter • deep – • mandibular nerve and branches

  9. Relations • Upper border –deep temporal and masseteric nerves • Lower border -lingual & inferior alveolar nerve • Sphenomandibular ligament • Middle meningeal artery.

  10. MEDIAL PTERYGOID • Origin-2 heads Deep- lateral pterygoid plate Superficial- tuberosity of maxilla & palatine bone • Insertion- medial surface of ramus & angle of mandible

  11. MEDIAL PTERYGOID • Nerve supply- branch from trunk of mandibular nerve • Actions- • Elevation of mandible • Protrusion of mandible • Side- side chewing movements

  12. RELATIONS • Lateral surface – • Ramus of mandible • Lateral pterygoid muscle • Sphenomandibular ligament. • Maxillary artery • Inferior alveolar vessels & nerve • Lingual nerve • Medial surface- • Tensor veli palatini • Superior constrictor of pharynx • Styloglossus and stylopharyngeus

  13. Masseter • Origin:Zygomatic Arch. • Insertion:Lateral surface of the ramus of the mandible. • Action:Elevation of the mandible combined with protraction

  14. Temporalis Origin: temporal fossa, temporal fascia . Insertion: coronoid process of the mandible. Action: • Elevates the mandible • Retraction – posterior fibers

  15. MANDIBULAR NERVE • Largest of 3 divisions of trigeminal nerve • Mixed nerve - sensory + motor root present • Sensory - trigeminal ganglion • Motor - pons • Emerge through Foramen ovale

  16. MANDIBULAR NERVE Trigeminal ganglion pons Sensory root Motor root Middle cranial fossa Foramen ovale unite Infratemporalfossa Trunk of the mandibular nerve Otic ganglion & middle meningeal artery lies behind the trunk. Medially-tensor velipalatini. Laterally-lateral pterygoid.

  17. BRANCHES: MANDIBULAR ERVE TRUNK MENINGEAL BRANCH NERVE TO THE MEDIAL PTERYGOID ANTERIOR POSTERIOR PREDOMINANTLY MOTOR PREDOMINANTLY SENSORY MASSETERIC NERVE AURICULO-TEMPORAL NERVE DEEP TEMPORAL NERVES INFERIOR ALVEOLAR NERVE NERVE TO THE LATERAL PTERYGOID LINGUAL NERVE BUCCAL NERVE

  18. Trunk

  19. MENINGEAL BRANCH(NERVUS SPINOSUS) FORAMEN SPINOSUM MIDDLE MENINGEAL ARTERY

  20. NERVE TO MEDIAL PTERYGOID

  21. Anterior division

  22. MASSETERIC NERVE MASSETERIC NERVE

  23. MASSETERIC NERVE TEMPORALIS LATERAL PTERYGOID MASSETERIC NERVE AND ARTERY INSERTION OF MASSETER MUSCLE

  24. DEEP TEMPORAL NERVES POSTERIOR DEEP TEMPORAL NERVE ANTERIOR DEEP TEMPORAL NERVE TEMPORALIS

  25. NERVE TO LATERAL PTERYGOID LATERAL PTERYGOID MUSCLE

  26. BUCCAL NERVE BUT NOT BUCCINATOR MUSCLE BUCCAL NERVE Skin of the mucous membrane of the cheek and gum of lower jaw opposite molar and premolar BUCCINATOR BUCCAL NERVE BUCCAL NERVE

  27. Posterior division

  28. AURICULOTEMPORAL NERVE 1.AURICULAR BRANCHES 1.SKIN OF THE TRAGUS 2.UPPER PART OF THE AURICLE 3.ROOF AND ANTERIOR WALL OF THE EXTERNAL ACOUSTIC MEATUS 4.CUTICULAR LAYER OF TYMPANIC MEMBRANE. 2.SUPERFICIAL TEMPORAL BRANCHES SKIN OF THE TEMPLE 3.ARTICULAR BRANCHES TEMPOROMANDIBULAR JOINT POSTERIOR ROOT OF THE ZYGOMA SUPERFICIAL TEMPORAL ARTERY AURICULOTEMPORAL NERVE SPHENO-MANDIBULAR LIGAMENT LATERAL PTERYGOID MUSCLE MIDDLE MENINGEAL ARTERY

  29. INFERIOR ALVEOLAR NERVE MYLOHYOID NERVE LATERAL PTERYGOID MUSCLE MYLOHYOID SUBMANDIBULAR GLAND SPHENOMANDIBULAR LIGAMENT INFERIOR ALVEOLAR ARTERY

  30. LINGUAL NERVE TENSOR VELI PALATINI MUSCLE . . . . . . . INFERIOR ALVEOLAR NERVE . LATERAL PTERYGOID MUSCLE CHORDA TYMPANI NERVE MEDIAL PTERYGOID MUSCLE

  31. LINGUAL NERVE THIRD MOLAR TOOTH MYLOHYOID MUSCLE STYLOGLOSSUSMUSCLE HYOGLOSSUS SUBMANDIBULAR GANGLION HYPOGLOSSAL NERVE SUBMANDIBULAR DUCT

  32. LINGUAL NERVE • DISTRIBUTION: • GENERAL SENSE TO PRE-SULCAL PART OF THE • TONGUE • TO THE FLOOR OF THE MOUTH • MANDIBULAR GUM.

  33. LINGUAL NERVE COMMUNICATIONS • COMMUNICATES WITH: • CHORDA TYMPANI NERVE • SUBMANDIBULAR GANGLION. • SECRETO-MOTOR FIBRES TO : • SUBMANDIBULAR GLAND • SUBLINGUAL GLAND. • TASTE SENSATION FROM: • ANTERIOR TWO THIRD OF THE TONGUE.

  34. CHORDA TYMPANI NERVE • Branch of facial nerve • Arises – • 6mm above stylomastoid foramen. • Medial to spine of sphenoid • Joins lingual nerve at acute angle

  35. OTIC GANGLION • Small,oval,parasympathetic ganglion. • 2-3 mm in size. • Situation – infratemporal fossa. • Topographically – mandibular nerve. • Functionally– glossopharyngeal nerve. • SITUATION: • Immediately below the foramen ovale. • Medial to the trunk of the mandibular • nerve. • Lateral to the tensor veli palatini muscle. • Infront of middle meningeal artery. • Behind the medial pterygoid muscle.

  36. CONNECTIONS AND BRANCHES OF OTIC GANGLION • PARASYMPATHETIC ROOT Preganglionic fibers Inferior salivatory nucleus Tympanic branch of the CN IX Tympanic plexus Lesser petrosal nerve ganglion relay

  37. CONNECTIONS AND BRANCHES OF OTIC GANGLION Post ganglionic fibers Ganglion Auriculo temporal nerve Secretomotorfibres to the parotid gland.

  38. CONNECTIONS AND BRANCHES OF OTIC GANGLION • Sympathetic root Superior cervical ganglion Plexus around the middle meningeal artery Ganglion Auriculotemporal nerve Vasomotor supply to the parotid gland

  39. Sensory branches • Auriculo temporal nerve • Somatic branches • Nerve to medial pterygoid • Supplies • Medial pterygoid • Tensor veli palatini • Tensor tympani

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