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 is also important to discuss what is called medication overuse headache (MOH). Many TMJ disorder patients that have headaches take medications often, and this can cause medication overuse headache. Most headachemedications can cause MOH, including acetaminophen (Tylenol), opioids (Vicodin), Triptans (Imitrex), etc. Each type of medication has itâs own criteria for how much use can cause MOH.