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 facts medical author: Melissa Conrad StÃ¶ppler, MD. Hydrocephalus is a condition characterized by excessive accumulation of fluid in the brain. Hydrocephalus may be congenital or acquired. Communicating hydrocephalus occurs when cerebrospinal fluid (CSF) can still flow among the ventricles. Noncommunicating hydrocephalus, also called obstructive hydrocephalus, occurs when the flow of CSF is blocked. Hydrocephalus affects about 1 out of every 500 children. The most obvious indication of hydrocephalus in children and infants is often a rapid increase in head circumference or an unusually large head size.