Cork and cork cambium (cork producing cell layer) are external Cortex-this is the primary tissue of the plant stem Phloem & Xylem are the inner most part and are concerned with carrying fluid and nutrients up and down the plant. Source(s): http://en.wikipedia.org/wiki/Bark. Orinoco Â· 9 years ago.
Malocclusion and bruxism are the most common causes of TMJ disorders. 1  Emotional stress is often the underlying cause of a TMJ disorder, as it can contribute to people either consciously or unconsciously tightening facial and jaw muscles and grinding or clenching their teeth.
People who have TMJ symptoms are undergoing a muscle spasm cycleâspasm, leading to contraction of the muscle, leading to more spasmâbecause of the neuromuscular system's protective mechanism. Therefore, it is necessary and vital to actively achieve relaxation of these muscles and break the spasm.