The mandible is a U-shaped bone. It is the only mobile bone of the facial skeleton, and, since it houses the lower teeth, its motion is essential for mastication. It is formed by intramembranous ossification. The mandible is composed of 2 hemimandibles joined at the midline by a vertical symphysis.
1 For example, AT&T charges $23 for a home residential line that includes a few additional basic features such as caller ID, call waiting and voicemail. 2  Home phone service plans that include local and long-distance calling cost $30-$45 per month.
The national average cost for basic cable is about $15 a month -- $30 for expanded basic, to which the vast majority of cable watchers subscribe. Add a high-speed Internet connection for $40, and you'd do well to budget $70 or so for the whole package.A bare-boned landline service typically costs about $20 to $25 a month.) Cell phone bills can vary widely by location, provider and, of course, your own personal use. But the average cell phone bill in the U.S. runs about $50 to $60 a month.