1 This drug may have the effect of speeding up your heart rate. 2  I worry about the effect that violent movies may have on children. 3  Certain chemicals have been banned because of their damaging effect on the environment.  It's important to protect your skin from the harmful effects of the sun.
The CSF from all theses sources , as well as any formed in the central canal of the spinal cord, escapes from the fourth ventricle into the subarachnoid space through the median aperture (of Magendie) and lateral aperture (of Luschka).
In solid mechanics, the shear flow q in a closed, thin-wall tube is defined as the internal shearing force V per unit of length of the perimeter around a thin section. Shear flow has the dimensions of force per unit of length.