Which type of tissue is considered the least radiosensitive?

Cerebrovascular tissue is considered the least radiosensitive type of tissue due to its relatively low rate of cell division. The radiosensitivity of tissues is largely determined by the proliferative capacity of their cells; tissues with high turnover rates, such as gastrointestinal and bone marrow tissues, are more sensitive to radiation. In contrast, cerebrovascular tissue consists of neurons and glial cells that are primarily post-mitotic, meaning they do not frequently undergo division. As a result, they are less affected by radiation exposure compared to more rapidly reproducing tissues. This characteristic contributes to the overall resilience of cerebrovascular tissue in the context of radiation damage.