Dural Venous Sinuses
Transcript of Dural Venous Sinuses
DURAL VENOUS SINUSES
definition
1.Venous spaces present between
the two layers of dura
2.Lined by endothelium
3.Devoid of valves
definition
4.Do not have muscle coat
in their tunica adventitia.
5.Contain CSF
Paired are:Cavernous sinuses JPetrosal sinuses H,I
Transverse sinuses GSigmoid sinuses C
Sphenoparietal sinuses A
ClassificationPaired and unpaired
unpaired are:Superior sagittal sinusInferior sagittal sinus
Straight sinusOccipital sinus
Basilar plexus of sinuses
Dural Venous Sinuses: Lateral View
A. Superior Sagittal Sinus
B. Great Cerebral Vein
C. Ophthalmic Veins
D. Facial Vein
E. Cavernous Sinus
F. Inferior Petrosal Sinus
G. Jugular Vein
H. Sigmoid Sinus
I. Superior Petrosal Sinus
J. Transverse Sinus
K. Straight Sinus
Cavernous sinusSituated on either side of the body of sphenoid
Extends from superior orbital fissureTo the apex of petrous temporal
Relations
Medially related to pituitary gland
and sphenoidal air sinus
Lateral wall contains
III,IV,V1,V2 nerves
Passing through the sinus are ICA and Abducent nerve
It receives tributaries from brainbones(skull),pterygoid plexus,
orbit and the eye(central vein of retina)
Connections
Superior and inferior ophthalmic veins (from the orbit)
are regarded as emissary veins
as they do not have valves.
Ophthalmic veins also have communication
with the facial vein(c&d) so the infections from
the ‘dangerous area’ of face can spread to
Cavernous sinus causing thrombosis.
drainage
Applied anatomy
1.infections from face, orbit,shenoid sinus can cause thrombosis.
2.III,IV,V1,V2,VI can be involved resulting invarious diplopias
3.rupture of ICA can cause pulsatile exophthalmos
Caput medusae in cavernous sinus thrombosis
MR image at the level of the pituitary stalk shows bilateral involvement of the cavernous sinuses with narrowing of the right internal carotid artery due to infiltration of the lesion (arrows).
Situated along the upper margin of the falx cerebriBegins at the foramen caecum near crista galli
(by the union of small veins from the nasal cavity)enlarges as it passes posterior
Superior sagittal sinus
Usually turns to the right side and
forms the right transverse sinus
Presents gaps called “lacunae laterales” which areThree on each side usually.
Arachnoid villi project into these playing important role in CSF circulation
Superior sagittal sinus
Arachnoid villi projecting into the sinus
Arachnoid foveae
Tributaries of sup.sagittal sinus
1.superior cerebral veins from brain2.emissary veins from the scalp
3.diploic veins and nose
1.infections can spread from scalp,nasal cavitycausing thrombosis.
2. It can be used to draw venous blood/ fluid administration through the anterior fontanelle
Transverse sinuses
Grooving the inner aspect of occipital bone
Transverse sinuses receive the cavernous sinuses through superior petrosal sinuses.
Right transverse sinus is usually larger than the left
because it is the continuation of superior sagittal sinus(!)
Left transverse sinus is formed by the continuation of straight sinus.
Straight sinus is formed by union of inferior sagittal sinus and great cerebral vein ( of Galen)
Straight sinus
Sigmoid sinuses
Continuations of transverse sinuses
Groove the inner aspect of posteroinferior angle
of parietal bone(mastoid angle)
Pass into jugular foramina and continue as
Internal jugular veins(IJV)
asterion
Groove for sigmoid sinus
TP
O
Close relation of sigmoid sinus with the mastoid process
Mastoid process
Sigmoid sinus
Sigmoid sinus thrombosis can occur as a complication of otitis media
(middle ear infection)
Identify
A
B