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DURAL VENOUS SINUSES

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definition

1.Venous spaces present between

the two layers of dura

2.Lined by endothelium

3.Devoid of valves

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Paired are:Cavernous sinuses JPetrosal sinuses H,I

Transverse sinuses GSigmoid sinuses C

Sphenoparietal sinuses A

ClassificationPaired and unpaired

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unpaired are:Superior sagittal sinusInferior sagittal sinus

Straight sinusOccipital sinus

asilar ple!us of sinuses

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"ural #enous Sinuses:$ateral #ie%

A. Superior Sagittal Sinus

B. Great Cerebral Vein

C. Ophthalmic Veins

D. Facial Vein

E. Cavernous Sinus

F. Inferior etrosal Sinus

G. !ugular Vein

". Sigmoi# Sinus

I. Superior etrosal Sinus

!. $ransverse Sinus

%. Straight Sinus

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Cavernous sinusSituated on either side of the &od' of sphenoid

(!tends from superior or&ital fissureTo the ape! of petrous temporal

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"elations

)ediall' related to pituitar' gland

and sphenoidal air sinus

$ateral %all contains

III,I#,#*,#+ nerves

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Passing through the sinus are ICA and A&ducent nerve

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It receives tri&utaries from &rain &ones s-ull.,pter'goid ple!us,

or&it and the e'e central vein of retina.

Connections

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Superior and inferior ophthalmicveins from the or&it.

are regarded as emissar' veins

as the' do not have valves/

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Ophthalmic veins also have communication

%ith the facial vein c 0 d. so the infections from

the 1dangerous area2 of face can spread to

Cavernous sinus causing throm&osis/

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drainage

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Applied anatomy

*/infections from face, or&it,shenoid sinus can cause throm&osis/+/III,I#,#*,#+,#I can &e involved resulting in

various diplopias3/rupture of ICA can cause pulsatile e!ophthalmos

Caput medusae in cavernous sinus throm&osis

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)4 image at the level of the pituitar' stal- sho%s &ilateral involvement of the cavernous sinuses %ith narro%ing of the right internal carotid arter' due to infiltration of the lesion arro%s./

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Situated along the upper margin of the fal! cere&riegins at the foramen caecum near crista galli

&' the union of small veins from the nasal cavit'.enlarges as it passes posterior

uperior sa#ittal sinus

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5suall' turns to the right side and

forms the right transverse sinus

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Presents gaps called 6lacunae laterales which areThree on each side usuall'/

Arachnoid villi pro7ect into these pla'ing important role in CS8 circulation

uperior sa#ittal sinus

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Arachnoid villi pro7ecting into the sinus

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Arachnoid foveae

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Tributaries of sup.sagittal sinus

*/superior cere&ral veins from &rain+/emissar' veins from the scalp

3/diploic veins and nose

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*/infections can spread from scalp,nasal cavit'causing throm&osis/

+/ It can &e used to dra% venous &lood9 fluid administration through the anterior fontanelle

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Transverse sinuses

Grooving the inner aspect of occipital &one

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Transverse sinuses receive the cavernous sinuses through superior petrosal sinuses/

4ight transverse sinus is usuall' largerthan the left

because it is the continuation of superior sagittal sinus(!)

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$eft transverse sinus is formed &' the continuation of straightsinus/

Straight sinus is formed &' unionof inferior sagittal sinus andgreat cere&ral vein of Galen.

Straight sinus

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Sigmoid sinuses

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Continuations of transverse sinuses

Groove the inner aspect of posteroinferior angle

of parietal &one mastoid angle.

Pass into 7ugular foramina and continue as

Internal 7ugular veins IJ#.

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asterion

Groove for sigmoid sinus

TP

O

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Close relation of sigmoid sinus %ith the mastoid process

)astoid process

Sigmoid sinus

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Sigmoid sinus thrombosis can occur

as a complication of otitis media(middle ear infection)

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Identif'

A