Finally, venules drain the capillary bed and penetrating venules bring blood back to the cortical surface where the pial veins discharge the blood into the venous sinuses.

What vessel drains blood from a capillary bed?

A venule is a small blood vessel in the microcirculation that allows deoxygenated blood to return from capillary beds to larger blood vessels called veins. Venules range from 8 to 100μm in diameter and are formed when capillaries come together. Many venules unite to form a vein.

What are capillary beds drained by?

Blood from the capillary bed is drained by the venules, which carry blood back toward the heart.