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.
It seems strange to think that something that affects a joint in the jaw can lead to anxiety, but TMJ is actually a fascinating disorder, and causes a host of different symptoms that can lead to the development of anxiety. However, it should be noted that TMJ often doesn't cause anxiety-instead, it makes anxiety worse.