During a normal cisternogram, radioactivity is visualized in which areas?

In a typical cisternogram, the non-invasive imaging procedure assesses the flow of cerebrospinal fluid (CSF) within the central nervous system. The primary goal is to visualize areas where radioactivity concentrates, indicating the distribution of CSF.

The correct answer outlines that radioactivity is visualized in several areas: the central canal, basal cisterns, cerebral convexities, and the subarachnoid space. These regions are significant as they collectively represent the critical pathways and spaces where the CSF circulates around the brain and spinal cord. The central canal serves as an important conduit within the spinal cord, while the basal cisterns and cerebral convexities refer to areas in and around the brain where CSF can pool and circulate effectively. The subarachnoid space is where the CSF bathes the brain and spinal cord, providing a protective cushion and allowing for nutrient exchange.

The other options present limited or incorrect regions of radioactivity visualization. For example, stating that radioactivity is only visualized in the subarachnoid space overlooks the complexities of CSF flow throughout the entire central nervous system, while the focus on the cerebral cortex or the spinal canal and ventricles alone does not provide a complete picture of the cisternogram