In medical terminology, which prefix would indicate a procedure involving the brain?

The prefix that indicates a procedure involving the brain is "neuro." This prefix is derived from the Greek word "neuron," meaning nerve. In medical terminology, it is commonly used to describe anything related to the nervous system, which includes not only the brain but also the spinal cord and nerves. Therefore, when a procedure involves the brain, it is often prefixed with "neuro," such as in the terms "neurosurgery" or "neurology," which specifically focus on the brain and its functions.

The other prefixes, while related to the head or skull, do not specifically refer to the brain itself. "Cranial" refers to the skull, "cephal" pertains to the head, and while these terms are related to anatomy, they do not target the brain as directly as "neuro." Thus, "neuro" is the most appropriate choice for indicating procedures specifically involving the brain.