Which most likely appear in the central nervous system only?

Interneurons are only found in the central nervous system.

Explanation:

Interneurons are only found in central nervous system (CNS), which connects one neuron to another. They receive information from one neuron ( like sensory neurons ) and transmits information to another neuron ( like motor neurons ). It is also known as association neurons.

Central nervous system is consist of Brain and Spinal cord. It is responsible for sensory information and responding accordingly. Interneurons are found in central nervous system that is brain and spinal cord not in the peripheral segments of the nervous system.

neurons will appear only in the nervous system

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