Question

Unipolar neurons are found usually in the embryonic stage. They have

• A. One axon and one dendrite
• B. Cell body and one axon
• C. Cell body with one axon and many dendrites
• D. Neither axon nor dendrites.

Hint:

Prefix logic: Uni = 1 process (axon only). Bi = 2 processes (1 axon + 1 dendrite). Multi = many processes (1 axon + many dendrites).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept: Neurons are classified structurally based on the number of processes (axons and dendrites) extending from their cell body (soma).
Step 2: Key Formula or Approach: Use the prefix of the neuron's classification ("uni-", "bi-", "multi-") to deduce the number of extending processes.
Step 3: Detailed Explanation: A unipolar neuron has a single process extending from its cell body.
This single process acts exclusively as an axon, and there are no true dendrites emerging directly from the cell body.
These types of neurons are typically found only in the early embryonic stage of human development.
In contrast, bipolar neurons have one axon and one dendrite (e.g., in the retina), and multipolar neurons have one axon and multiple dendrites (e.g., in the cerebral cortex).
Step 4: Final Answer: A unipolar neuron consists of a cell body and one axon, making option (2) correct.