Neuronal circuits, the building blocks of the nervous system, weave a network of interconnected neurons that collaborate to process and transmit information. These circuits form the bedrock of sensory integration, motor coordination, and higher-order cognitive functions. Comprising sensory neurons, interneurons, and motor neurons, these circuits rely on synaptic connections to convey signals through chemical or electrical means. The architecture of neuronal circuits varies, with specialized sensory circuits attuned to specific stimuli and motor circuits finely orchestrating precise movements. At higher levels, complex cognitive functions like decision-making and memory formation emerge from intricate neuronal interplay. Techniques such as electrophysiology and imaging unveil the activity patterns within these circuits, providing insights into their organizational principles. Understanding neuronal circuits not only illuminates fundamental brain processes but also informs therapeutic strategies for neurological and psychiatric ailments, holding promise for improved treatment outcomes and enhanced quality of life.