Secondary xylem = wood (heartwood / sapwood)

Secondary phloem = living bark

dead bark = protective dermal tissue outside, composed of one or several cork layers and other tissue in between

-the cambium mostly produces cells elongated along the axis but some cells are radially stretched for radial transport: these form the rays

A stem can be cut in any way, but three main directions of the cut permit to analyse and classify wood

->cross-section: shows the width of the longitudinal cells and of the rays

->radial section: along the extension of vessels and rays

->tangential section: along the vessels, height and width of rays are visible