A nursing instructor is leading a group discussion on congenital hydrocephalus. The instructor determines the session is successful after the students correctly choose which factor that determines the noncommunicating type?

Hydrocephalus is produced when there is an imbalance between the cerebrospinal fluid (CSF) produced by the choroid plexus and its absorption into the bloodstream. It is a congenital disease that can be divided into two major classes: communicating and non-communicating hydrocephalus. Communicating hydrocephalus is caused by blockage of the CSF circulation pathway after exit from the ventricles, while the non-communicating type is caused by the obstruction of one or more ventricles in the brain. Thus, the disruption of the ventricular zone (i.e., both the obstruction within a ventricle and the connection between ventricles) is known to cause non-communicating hydrocephalus, while the factors associated with communicating hydrocephalus include insufficient CSF reabsorption, excessive CSF production and defective flow of CSF.

the ileocecal valve (also called bauhin valve), which limits the rate of food passage into the cecum and may prevent material from returning to the small intestine.