DR. PRATIK MISTRY

INTERIOR OF CRANIAL CAVITY

INTRODUCTION

Skin

Galea Aponeurotica

Connective Tissue

Bone

Dura Mater

Arachnoid mater

Dura Mater• Tough and leathery.• Most superficial.• 2 layers:

– Periosteal attached to the skull

– Meningeal true external covering, extends downward and surrounds spinal cord

DURAL VENOUS SINUSES

CHARACTERISTICS

CLASSIFICATIONUNPAIREDUNPAIREDSuperior sagittalSuperior sagittalInferior sagittalInferior sagittalStraightStraightOccipitalOccipitalAnterior Anterior

intercavernousintercavernousPosterior Posterior

intercavernousintercavernousBasillar venous Basillar venous

plexusplexus

PAIREDPAIREDTransverseTransverseSigmoidSigmoidCavernousCavernousSuperior petrosalSuperior petrosalInferior petrosalInferior petrosalSphenoparietalSphenoparietalPetrosquamousPetrosquamousMiddle meningeal

veins

SUPERIOR SAGITTAL SINUS

TRIBUTARIESTRIBUTARIESSup. Cerebral veinsSup. Cerebral veinsEmissary veinsEmissary veins

COMMUNICTINSCOMMUNICTINSVeins of scalpVeins of scalpVeins of noseVeins of noseWith cavernous With cavernous

sinussinus

INFERIOR SAGITTAL SINUS

STRAIGHT SINUSTRIBUTARIESTRIBUTARIESInf. Sagittal sinusCerebeller veinsGreat cerebral vein of

galen

OCCIPITAL SINUS

ANT & POST INTERCAVERNOUS SINUS

BASILAR VENOUS PLEXUS

PAIRED SINUSES

TRANSVERSE SINUS

TRIBUTARIESTRIBUTARIESSup petrosal

sinusInf. cerebral

veinsInf. cerebeller

veinsInf.

Anastomotic vein

SIGMOID SINUSTRIBUTARIESTRIBUTARIESmastoid emissary

veinCerbeller veinLabyrinthine vein

CAVERNOUS SINUS

Paired sinuses on each side of body of sphenoid

Extend from sup orbital fissure to the apex of petrous temporal bone

Internally spongy in appearance so called cavernous

2x1 measurementsFormed by separation

of two layers of duraRoof & lat wall :

meningeal layerFloor & medial wall :

endosteal layer

STRUCTURES PASSING THROUGH SINUS

Internal carotid artery

Abducent nerveIn the lateral wall of

it lies 1. oculomotor nerve 2. trochlear nerve 3. ophthalmic nerve 4. maxillary nerve

RELATIONSINFEROMEDIALLYPitutairy gland,

sphenoid sinusLATERALLYTrigeminal ganglion,

temporal lobe of brainABOVEOptic chiasma, part of

ICA

TRIBUTARIES AND COMMUNICATIONS

Sup ophthalmic vein

Br of inf ophthalmic vein

Central vein of retina

Superficial middle cerebral vein

Inf cerebral veinSphenoparietal

sinus

SUPERIOR PETROSAL SINUS

INFERIOR PETROSAL SINUS

SPHENOPARIETAL SINUS

MIDDLE MENINGEAL VEINS

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