1 If a lot of blood leaks out, it can cause a buildup of pressure in the brain because the brain is enclosed in the skull. There is no room for brain tissue to expand, and so the leaked blood can compress and kill important areas of the brain.  Hemorrhagic strokes tend to be more serious than ischemic strokes.
Horizontal definition, at right angles to the vertical; parallel to level ground. See more.
A horizontal curriculum means that what is studied in one particular course in an institution is in line with other, similar classes both in terms of course content and evaluation. Horizontal coherence means that teachers are evaluating students based on the standards for a particular subject and grade level.