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.
TMJ disorders are usually caused by a blow or an impact to your jaw, joint erosion and arthritis damage. However, muscle fatigue and muscle tension can cause TMJ disorders, especially if you habitually clench your jaw or grind your teeth.he TM joint is located on either side of your face just in front of your ears, where your skull and jawbone meet. Certain vitamin supplements can help reduce the symptoms associated with TMJ either by affecting your muscles directly, or by treating the underlying causes of TMJ disorders.