Flow chart of cranial dura

 

Cranial dural sinus

Cranial dura has two layer : endoesteum layer and meningeal layer

The sinuses of the dura mater are venous channels which drain the blood from the brain;

They are situated between the two layers of the dura mater

They are devoid of valves, and and lined by endothelium but no smooth muscle cells layer.

Different types of dural venous sinus:

1. Pair: cavernous sinus, transverse sinus, sigmoid sinus etc.
2. unpair: superior sagittal sinus, inferior sagittal sinus, straight sinus etc.

Flow chart of cranial dura 

A. Superior sagittal sinus > right transverse sinus > right sigmoid sinus > right internal jugular vein

 B. Inferior sagittal sinus > straight sinus > left transverse sinus > left  sigmoid sinus > left internal jugular vein