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 headaches are one of the more common TMJ symptoms. These headaches can often be so severe that they are mistaken for migraines! Whatâs worse is that the pain of a TMJ headache can actually trigger a really migraine, only adding to the pain! TMJ headaches are felt along the temples because the temporalis muscle spreads out over this area. When the muscle is strained for too long it will begin spasming and this will cause headache pain. Unfortunately, these headaches can last for extremely long periods of time.