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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
THANK YOU