Final answer:
The incision for supratentorial surgery is typically made behind the hairline to access the area above the tentorium cerebelli, where the frontal, parietal, temporal, and occipital lobes are located, while minimizing visible scarring.
Step-by-step explanation:
After supratentorial surgery, the incision is typically made behind the hairline. The term 'supratentorial' refers to the part of the brain located above the tentorium cerebelli, which is a structure that separates the cerebrum from the cerebellum. This area contains the frontal, parietal, temporal, and occipital lobes of the brain. To access this area, neurosurgeons often make an incision behind the hairline to minimize visible scarring and because it provides a direct approach to the desired location within the cranium. Therefore, the correct answer to the question is c) Behind the hairline.