The stimulated two intorters (right eye) and the two extorters (left eye) have opposite vertical actions i.e., one is an elevator and the other is a depressor. The opposite vertical actions nearly cancel each other and therefore only a small vertical deviation occurs, whereas their identical torsional actions are additive. In case of any lesion from the utricle to the brainstem, diminished input from the affected vestibular pathway, for example the left vestibular is the same as stimulation of right vestibular pathway, resulting in the erroneous interpretation by the brain that the head is tilted to the right and consequently that the SVV is tilted to the left. This causes reflex rotation of the head to the left, thus realigning the eyes and head to a position that is actually tilted but which the brain interprets as vertical. Published literature on ocular torsion in physiologic ocular counter-roll are usually not very clear on the type of head tilt inducing the torsion, i.e., initial head tilt causing a tilt in the SVV or the compensatory head tilt to realign SVV with the true vertical. It has been stated that the ocular torsion in physiologic ocular counter-roll appears in the opposite direction as that of the head tilt in contrast to the same direction of ocular torsion as the head tilt in pathologic ocular tilt reaction.
In medicine, pleocytosis (or pleiocytosis) is an increased cell count (from Greek pleion, "more"), particularly an increase in white blood cell count, in a bodily fluid, such as cerebrospinal fluid. It is often defined specifically as an increased white blood cell count in cerebrospinal fluid.Increased white blood cell count in the blood is called leukocytosis. == References ==