Name (also cambium ring) for the hollow cylindrical growth layer in stems, stems and roots of plants. This cell layer, consisting of only one layer, is located between the outermost bark (bark and bast) and the sapwood zone (young wood). In the course of thickness growth, the cambium releases the cells of the bast to the outside and the cells of the wood to the inside. The inner cells are called xylem, the outer cells phloem. Xylem and phloem form the leading tissue responsible for the transport of nutrients and water. For more information about the vine, see vine stock and shoots.