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.
Pain caused by this disorder can present itself in a variety of ways, including headaches, migraines, pain in the jaw, neck, or shoulders, and general pain in the face. Other symptoms of TMJ include dizziness, nausea, ringing of the ears, and loss of normal function of the jaw. People who suffer from this syndrome may experience strange noises when opening and closing their mouths. They may also lose the ability to completely close or open their mouths.