The lateral grey column is composed of sympathetic preganglionic visceral motor neurons which are part of the autonomic nervous system. An in-depth study of the lateral grey columns in the thoracic region of rats revealed two types of cells. One cell type was characterized by many mitochondria, an indented nucleus, and a long endoplasmic reticulum, while the other cell type had an increased cytoplasmic density and a short endoplasmic reticulum. Lateral column axon terminals were found to contain noradrenaline storage granules and could be divided into four types. Type one terminals contained a few large and many small granular vesicles, and type two terminals had many large vesicles and barely noticeable granules. Type three terminals contained small, spherical vesicles and no granules, and type four were the rarest terminals that had flattened vesicles with small and large granules.