As the name suggests, drywall is used to create walls and ceilings inside a house or other structure where it will not be exposed to the elements. In the US, houses older than 1917 will not have drywall unless later remodeling was done. 1917 was when the U.S. Gypsum Company introduced the product to the US market.
Communicating hydrocephalus, also known as non-obstructive hydrocephalus, is caused by impaired cerebrospinal fluid reabsorption in the absence of any CSF-flow obstruction between the ventricles and subarachnoid space.ydrocephalus is usually due to blockage of cerebrospinal fluid (CSF) outflow in the ventricles or in the subarachnoid space over the brain. In a person without hydrocephalus, CSF continuously circulates through the brain, its ventricles and the spinal cord and is continuously drained away into the circulatory system.
Hydrocephalus is a condition characterized by abnormal flow and/or re-absorption of the cerebrospinal fluid, the water-like liquid that surrounds the brain and spinal cord and fills the open spaces within the brain, the ventricles.ydrocephalus can be caused by some visible (on brain scans) obstruction of the normal flow this fluid. This obstruction may be a congenital or acquired scarring in some part of the ventricular system or it can be from a mass such as a brain tumor which blocks the normal flow of fluid.