In pumps. Flexible impeller of cooling system pump of an outboard engine. An impeller is a rotating component of a centrifugal pump, usually made of iron, steel, bronze, brass, aluminium or plastic, which transfers energy from the motor that drives the pump to the fluid being pumped by accelerating the fluid outwards from the center of rotation.
noun, plural: dorsal root ganglia. (neuroanatomy) The ganglion on the dorsal root of every spinal nerve. It is where the cell bodies of sensory neurons are located; hence, it is chiefly involved in the transmission of sensory information.
Among vertebrates there are three major groups of ganglia: 1  Dorsal root ganglia (also known as the spinal ganglia) contain the cell bodies of sensory (afferent) nerves. 2  Cranial nerve ganglia, contain neurons of the cranial nerves. 3  Autonomic ganglia contain the cell bodies of autonomic nerves.owever, in the brain (part of the central nervous system), the  basal ganglia , or basal nuclei, is a group of nuclei interconnected with the cerebral cortex, thalamus and brainstem, associated with a variety of functions: motor control, cognition, emotions, and learning.