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.
Temporomandibular Joint (TMJ) Problems. The temporomandibular joint (TMJ) has a substantial influence on the occlusion (bite). Problems with the TMJ may be due to: developmental factors, fractures, chronic inflammation or luxation. Trauma seems to be the most common cause of TMJ problems in our clinical case experience.