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venous dural sinuses and cavenous venous sinus
- 1. VENOUS SINUSES IN DURA MATER & CAVERNOUS SINUS PRESENTED BY: DR. URVASHI SODVADIA DEPT OF CONSERVATIVE DENTISTRY & ENDODONTICS
- 2. CONTENTS Brief Introduction of meninges Structure of dura mater Introduction of venous sinuses Cavernous sinus Clinical aspect Drainage of venous sinuses Summary
- 4. DURA MATER Outer most layer Latin meaning : “hard mother” Two layers: o Periosteal layer o Meningeal layer Subdural space Epidural space
- 5. FOUR DURAL INFOLDING : Falx cerebri Tentorium cerebelli Falx cerebelli Diaphragma celli Dural venous sinuses
- 7. FALX CEREBRI LARGEST dural infolding Sickle shaped Separates cerebral hemispheres Attachments
- 8. Superior Sagittal Sinus Inferior Sagittal Sinus Straight Sinus Confluence of Sinuses
- 9. TENTORIUM CEREBELLI “TENT OF CEREBELLUM” Straight sinus Relations
- 10. Superior Petrosal SinusTransverse Sinus
- 11. CLINICAL ASPECTS o Epidural haematoma (middle meningeal artery) o Subdural haematoma (superior cerebral vein)
- 13. ARACHNOID MATER Loosely surrounds the brain without dipping into sulci Subarachnoid space contains CSF Arachnoid villi Arachnoid granulation
- 14. Absorb CSF
- 15. PIA MATER Innermost layer “TENDER MOHER” Highly vascular, impermeable to fluid Arachnoid trabeculae MENINGITIS
- 16. VENOUS SINUSES
- 17. ARTERIAL SUPPLY VENOUS SUPPLY MAINLY BY 2 SYSTEMS : oInternal carotid system oVertebral basillary system Does not follow the arterial supply ! Drains by “ DURAL VENOUS SINUS” B R A I N ARTERIAL SUPPLY B R A I N
- 18. VENOUS SINUSES Intracranial venous channels lined by endothelium No muscles No valves Communicates with veins outside skull through “ Emissary veins” 23 venous sinuses : 8 – Paired, 7 – Unpaired VENOUS SINUSES
- 19. Paired Venous Sinus Unpaired Venous Sinus oCavernous sinus oSuperior petrosal sinus oInferior petrosal sinus oTransverse sinus oSigmoid sinus oSphenoparietal sinus oPetrosquamous sinus oMiddle meningeal sinus/veins oSuperior sagittal sinus oInferior sagittal sinus oStraight sinus oOccipital sinus oAnterior intracavernous sinus oPosterior intracavernous sinus oBasilar plexus of veins
- 20. Larger venous space situated into middle cranial fossa ,on either side of body of sphenoid bone Interior is divided into number of spaces or caverns by trabeculae CAVERNOUS SINUS
- 21. R L M F MENINGEAL DURA MATER ENDOSTEAL DURA MATER 2 cm 1 cm ATTACHMENTS
- 22. RELATIONS SUPERIORLY Olfactory tract Optic tract Optic chiasma Anterior perforated substances
- 23. INFERIORLY
- 24. M E D I A L L Y
- 27. STRUCTURE WITHIN LATERAL WALL OF SINUS
- 28. IIIIVV
- 29. THROUGH CENTER OF SINUS
- 31. TRIBUTARIES OR INCOMING CHANNELS FROM ORBIT
- 32. FROM BRAIN & MENINGES Superficial middle cerebral vein Superficial middle cerebral vein Sphenoparietal sinus &middle meningeal vein
- 33. DRAINING CHANNELS OR COMMUNICATIONS superior petrosal sinus Transverse sinus Inferior petrosal sinus
- 35. CLINICAL ANATOMY OF CAVERNOUS SINUS THROMBOSIS OF CAVERNOUS SINUS
- 36. ETIOLOGY
- 37. NERVOUS SYMPTOMS VENOUS SYMPTOMS Severe pain Headache III nerve IV nerve VI nerve Edema of eyelid,cornea & root of nose exophthalmosKnown site of infection “EAGLETON CRITERIA”
- 39. PULSATING EXOPHTHALMOS: eyeball protrudes and pulsates with each heart beat.
- 43. THANK YOU!