Which of the following is NOT a type of glial cell found in the central nervous system (CNS)?

• A. Oligodendrocyte
• B. Astrocyte
• C. Schwann cell
• D. Microglia

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the role of glial cells in the nervous system. Glial cells are non-neuronal cells that provide support, protection, and insulation for neurons. They are essential for maintaining homeostasis and proper functioning of the nervous system.
2. Step 2: Identify the types of glial cells found in the central nervous system (CNS). The CNS includes the brain and spinal cord, and the primary glial cells found here are oligodendrocytes, astrocytes, and microglia.
3. Step 3: Learn the specific functions of each CNS glial cell type: Oligodendrocytes produce myelin to insulate axons, astrocytes provide structural support and regulate the blood-brain barrier, and microglia act as immune cells to remove debris and pathogens.
4. Step 4: Recognize that Schwann cells are not found in the CNS. Schwann cells are glial cells of the peripheral nervous system (PNS), where they produce myelin for peripheral nerves.
5. Step 5: Conclude that Schwann cells are the correct answer because they are not a type of glial cell found in the CNS, unlike oligodendrocytes, astrocytes, and microglia.