system instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity; "he bought a new stereo system"; "the system consists of a motor and a small computer"
glia,
neuroglia sustentacular tissue that surrounds and supports neurons in the central nervous system; glial and neural cells together compose the tissue of the central nervous system
encephalon,
brain that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord
corticospinal tract,
pyramidal motor system,
pyramidal tract any of the important motor nerves on each side of the central nervous system that run from the sensorimotor areas of the cortex through the brainstem to motor neurons of the cranial nerve nuclei and the ventral root of the spinal cord