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8/12/2019 14350807 Dural Venous Sinuses
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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