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.
Some of the most common TMJ symptoms include: Headaches (often mimicking migraines), earaches, and pain and pressure behind the eyes. A clicking or popping sound when you open or close your mouth. Pain brought on by yawning, opening the mouth widely or chewing. Jaws that get stuck, lock or go out.