1. 11 Objective:To introduce the clinic adopted of titanium AF in thoracic vertebra and lumbar fracture dislocation and spinal cord scathe.

2. In the mediastinum, at the level of the fifth thoracic vertebra, the trachea divides into the right and left primary Bronchi.The Bronchi branch into smaller and smaller passageways until they terminate in tiny air sacs called alveoli.