For example, a peripheral neuropathy caused by a vitamin deficiency can be treated -- even reversed -- with vitamin therapy and an improved diet. Likewise, nerve damage brought on by alcohol abuse can often be stopped and improved by avoiding alcohol.
2. Vascular tissue - xylem and phloem in leaves form in strands called veins. Xylem forms on the upper side of a vein (on a vertical leaf, on the side next to the stem), and phloem on the lower side (side away from the stem). a. Veins are like a leaf's fingerprint and can be used to identify plants.
Leaves are attached to the 'stem' at nodes and spaces between nodes are called internodes. The presence of nodes and internodes means that the bulb is actually a modified stem. The papery covering is called a tunica. Note the basal plate and the lack of roots. Tunicate bulbs produce a new (adventitious--not pre-formed) root system annually from the basal plate.