GRAY SUBSTANCE OF CNS HAVING COMPACT LOCATION OF NEURON BODIES: a. reticular b. cortex c. nuclei d. neuropil e. mosaic

The correct answer is c. nuclei.The gray substance of the central nervous system (CNS) refers to the areas of the brain and spinal cord that contain a high concentration of neuronal cell bodies, dendrites, and unmyelinated axons. These areas appear gray in color due to the lack of myelin, which is a fatty substance that surrounds and insulates axons.The gray substance is organized into different regions, including the cortex, nuclei, and neuropil. The cortex is the outermost layer of the brain, composed of a thin layer of neurons and their dendrites. The neuropil refers to the dense network of neurons and their connections within the CNS. The reticular formation is a network of neurons located in the brainstem that plays a role in regulating various functions, such as arousal and attention. The mosaic refers to the pattern of neurons and their connections within the CNS.Among the options provided, the nuclei are the correct answer. Nuclei are clusters of neuronal cell bodies located within the CNS. They are compactly located and are responsible for processing and integrating information within the CNS. Nuclei are found in various regions of the brain, such as the basal ganglia, thalamus, and brainstem.