Cerebrospinal fluid is formed by capillary knots called (1)
which hang into the (2) of the brain. Ordinarily, cerebro-
spinal fluid flows from the lateral ventricles to the third
ventricle and then through the (3) to the fourth ventricle.
(4) of the spinal
Some of the fluid continues down the (4)
cord, but most of it circulates into the (5) by passing
through three tiny openings in the walls of the (6). As a
rule, cerebrospinal fluid is formed and drained back into the
venous blood at the same rate. If its drainage is blocked, a
condition called (7) occurs, which results in increased
pressure on the brain.