Step 27: Add the internal jugular veins which drain the entire system.
Step 28: Add the inferior petrosal sinuses best seen on the cadavers left side, but a part is seen on the right.
Step 29: Add the cavernous sinuses seen best on the cadver's left side.
The superior petrosal, the sphenoparietal, intercavernous and the basilar sinuses cannot be seen on this cadaver.
Step 30: Add the cranial dura mater that separates the major areas of the brain and forms the sinuses thriough which the venous return from the brain returns to the general circulation.
Step 31: Add the sagittal plane through the cadaver. Use the Rotate tool to see the relationship of the venous return to the brain
Step 32: Add the coronal plane and, using the Rotate tool, rotate the cadaver in order to get a sense of the 3D anatomy.
Step 33: Add the cranial dura mater to see the 3D relationship to the brain of these component parts.
