Which term best describes the view that the nervous system is made up of distinct cellular units?

• A. Reticular theory
• B. Localization theory
• C. Neuron doctrine
• D. Synaptic theory

Answer: (C)

The main idea here is that the nervous system is built from individual cells called neurons that communicate across gaps at synapses. This view is known as the neuron doctrine. It holds that neurons are discrete units with their own membranes and processes (like dendrites and axons), and that signals pass from one neuron to another across specialized contact points rather than through a continuous, shared network. This concept was cemented by microscopic staining studies showing individual cells, and it explained how brain function could be localized to specific cells and pathways while still supporting coordinated activity through synaptic connections.

This contrasts with reticular theory, which imagined the nervous system as a single, uninterrupted fabric. Localization theory focuses on where functions reside in the brain, not on the cellular structure of the tissue. Synaptic theory isn’t the standard label for this cellular-unit view, though it aligns with the idea that communication happens at synapses between discrete cells.