Question: All are tributaries/connections of cavernous sinus except

Q. All are tributaries/connections of cavernous sinus except
1.Superficial middle cerebral vein
2.Deep middle cerebral vein
3.Superior petrosal sinus
4.Inferior petrosal sinus


Ans. 2.Deep middle cerebral vein.
Explanation: Deep middle cerebral vein(2) runs in the lateral sulcus of cerebrum and joins the anterior cerebral vein & Striate veins.
The resultant vein is called basal vein which is going to drain into the great cerebral vein of Galen.
*Superficial middle cerebral vein(1) also runs in the lateral sulcus of cerebrum and drains into the cavernous sinus.
It gets connected to deep middle cerebral vein and also to superior sagittal sinus & transverse sinus by anastomosing veins.
*Superior & inferior petrosal sinuses (3 & 4) are considered to drain the blood of cavernous sinus towards the internal jugular vein.
Note 1: It is customary to consider venous blood entering cavernous sinus from the anterior end and leaving it towards postero-inferior direction, ultimately into the internal jugular vein.
Neverthless, blood can flow in either direction since, the venous sinuses are valveless channels.
Note 2: Superficial middle cerebral vein can carry an emboli from cavernous sinus thrombosis towards the cerebrum.