Venous Blood Supply & Lymphatic Drainage

Where are the veins of the spinal cord located?

At the level of the pia mater, forming a venous plexus.

How many lateral venous ducts are there?

4 ducts, grouped in pairs on each side.

Position of lateral venous ducts relative to posterior root?

Anterior to the entrance of the posterior root.

Position of lateral venous ducts relative to anterior root?

Posterior to the exit of the anterior root.

Through what do venous ducts drain?

Radicular veins.

Where do radicular veins drain?

Peridural venous plexus.

Where does the peridural venous plexus drain?

Intercostal veins, Lumbar veins, Sacral extrarachidian veins.

Where do veins drain at the skull base?

Cerebral venous sinuses.

Why is venous blood flow bidirectional?

Because veins lack valves.

Where does lymph from the perivascular sheath drain?

Subarachnoid spaces.