Final answer:
c) Encephalotome
The correct instrument for incising brain tissue is an encephalotome, which allows for precision cutting within the brain.
Step-by-step explanation:
The instrument used for incising brain tissue is known as an encephalotome. This term refers to a surgical tool specifically designed for cutting into the brain. Therefore, the correct answer to the question is c) Encephalotome. Using an encephalotome, surgeons can perform precise cuts to either remove brain tissue or access areas within the brain for treatment. It's important to note that the other terms refer to different concepts: 'Cerebrotomy' suggests an incision into the cerebrum, 'Cerebrectomy' implies the removal of cerebrum tissue, and an 'Encephalocele' is a birth defect where brain tissue protrudes out to the skull.