What is glioma?

Glioma refers to a type of tumor that originates from glial cells in the brain or spine, which are supportive cells that help maintain the health of neurons. The term "neuroglia" refers specifically to these glial cells that provide structural support, nourishment, and protection for neurons. Gliomas can vary in their aggressiveness, location, and the specific type of glial cell from which they arise, including astrocytes (astrocytomas), oligodendrocytes (oligodendrogliomas), and ependymal cells (ependymomas).

This option correctly captures the essence of what glioma is—specifically focusing on the tumor's origin from neuroglial cells, as opposed to any other types of cells or tumor characteristics related to other medical conditions. The other choices either describe unrelated anatomical features, conditions, or cell types that do not pertain to gliomas, reinforcing why this choice is the most accurate representation of the term.