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venous dural sinuses and cavenous venous sinus
- 1. VENOUS SINUSES IN DURAMATER & CAVERNOUS SINUS PRESENTED BY: DR. URVASHI SODVADIA DEPT OF CONSERVATIVE DENTISTRY & ENDODONTICS
- 2. CONTENTS Brief Introduction ofmeninges Structure of dura mater Introduction of venous sinuses Cavernous sinus Clinical aspect Drainage of venous sinuses Summary
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- 4. DURA MATER Outer mostlayer 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
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- 7. FALX CEREBRI LARGEST duralinfolding Sickle shaped Separates cerebral hemispheres Attachments
- 8. Superior Sagittal Sinus InferiorSagittal Sinus Straight Sinus Confluence of Sinuses
- 9. TENTORIUM CEREBELLI “TENT OF CEREBELLUM” Straightsinus Relations
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- 11. CLINICAL ASPECTS o Epiduralhaematoma (middle meningeal artery) o Subdural haematoma (superior cerebral vein)
- 13. ARACHNOID MATER Loosely surrounds the brainwithout dipping into sulci Subarachnoid space contains CSF Arachnoid villi Arachnoid granulation
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- 15. PIA MATER Innermost layer “TENDERMOHER” Highly vascular, impermeable to fluid Arachnoid trabeculae MENINGITIS
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- 17. ARTERIAL SUPPLY VENOUSSUPPLY 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 venouschannels 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 SinusUnpaired 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 spacesituated 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 DURAMATER 2 cm 1 cm ATTACHMENTS
- 22. RELATIONS SUPERIORLY Olfactory tract Optic tract Opticchiasma Anterior perforated substances
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- 27. STRUCTURE WITHIN LATERALWALL OF SINUS
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- 29. THROUGH CENTER OFSINUS
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- 31. TRIBUTARIES OR INCOMINGCHANNELS FROM ORBIT
- 32. FROM BRAIN &MENINGES Superficial middle cerebral vein Superficial middle cerebral vein Sphenoparietal sinus &middle meningeal vein
- 33. DRAINING CHANNELS ORCOMMUNICATIONS superior petrosal sinus Transverse sinus Inferior petrosal sinus
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- 35. CLINICAL ANATOMY OFCAVERNOUS SINUS THROMBOSIS OF CAVERNOUS SINUS
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- 37. NERVOUS SYMPTOMS VENOUSSYMPTOMS Severe pain Headache III nerve IV nerve VI nerve Edema of eyelid,cornea & root of nose exophthalmosKnown site of infection “EAGLETON CRITERIA”
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- 39. PULSATING EXOPHTHALMOS: eyeballprotrudes and pulsates with each heart beat.
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