They appear as small brown nodules in the septum of the alveolus. A tooth sits in a specialized socket called the alveolus. The maxillopalatine suture midline terminus is level to the fourth maxillary alveolus. The alveolar bone is the bone of the jaw which forms the alveolus around teeth. The guard attached to the phragmocone in a socket called the alveolus. Treatment and prognosis are usually based upon keeping these teeth and preserving the alveolus. This injury involves the alveolar bone and may extend beyond the alveolus. These type I cells also make up the alveolar septa which separate each alveolus. The internal surface of the alveolus is covered with a thin coat of fluid. The alveolar ridges contain the sockets (alveoli, singular "alveolus") of the teeth. The gland alveolus is a sac that is divided into three specific regions/layers. The term "acinus" is considered synonymous with alveolus by some sources, but not all. The alveolus is the basic anatomical unit of gas exchange in the lung. The alveolar process is the lining of the tooth socket or alveolus (plural, alveoli). This type of fracture involves the alveolus, also termed the alveolar process of the mandible.