Common Misconceptions About Nervous System

The most common misconception about the nervous system is that it is a single, unified entity, when in fact it is composed of two distinct systems: the central nervous system (CNS) and the peripheral nervous system (PNS), with the CNS comprising the brain and spinal cord, and the PNS consisting of nerves that connect the CNS to the rest of the body (Kandel, 2000).

Misconceptions

• Myth: The nervous system is solely responsible for controlling voluntary movements, such as walking and talking.
• Fact: The nervous system also controls involuntary movements, such as digestion and heart rate, with the autonomic nervous system regulating these functions (Berne, 2004).
• Source of confusion: This myth persists due to the emphasis on voluntary movement in introductory neuroscience textbooks, such as Bear's Neuroscience: Exploring the Brain.
• Myth: The brain and spinal cord are the only components of the nervous system.
• Fact: The PNS, which includes nerves such as the vagus nerve, plays a crucial role in transmitting and receiving information between the CNS and the rest of the body, with the vagus nerve alone containing ~100,000 fibers (Guyton, 2006).
• Source of confusion: The media narrative often focuses on the brain as the sole controller of the body, neglecting the importance of the PNS.
• Myth: Neurotransmitters are only involved in transmitting signals between neurons.
• Fact: Neurotransmitters, such as dopamine and serotonin, also play a role in regulating various bodily functions, including mood, appetite, and sleep, with dopamine regulating reward processing in the nucleus accumbens (Schultz, 2002).
• Source of confusion: This myth persists due to the oversimplification of neurotransmitter function in popular science literature.
• Myth: The nervous system is fully formed at birth.
• Fact: The nervous system continues to develop and mature throughout childhood and adolescence, with synaptic pruning occurring until the mid-20s (Huttenlocher, 1979).
• Source of confusion: The logical fallacy of assuming that the nervous system is fully developed at birth is perpetuated by the lack of discussion on neural development in non-technical literature.
• Myth: The nervous system is incapable of repairing itself.
• Fact: The nervous system has a limited capacity for neuroplasticity, with the brain able to reorganize itself in response to injury or experience, as seen in the London taxi drivers who develop increased hippocampal volume (Maguire, 2000).
• Source of confusion: This myth persists due to the historical view of the nervous system as a fixed, unchangeable entity.

Quick Reference

• Myth: Nervous system is a single entity → Fact: Composed of CNS and PNS
• Myth: Nervous system only controls voluntary movement → Fact: Also controls involuntary movements
• Myth: Brain and spinal cord are the only components → Fact: PNS plays a crucial role
• Myth: Neurotransmitters only transmit signals → Fact: Regulate various bodily functions
• Myth: Nervous system is fully formed at birth → Fact: Continues to develop throughout childhood and adolescence
• Myth: Nervous system is incapable of repairing itself → Fact: Has a limited capacity for neuroplasticity