The back part of your lower jaw (called the ramus) has a clear relationship with the tilt of your maxilla (upper jaw). When the mandible growth vertically, the ramus tends to be shorter -upper jaw tilts down toward the the vertical plane. When the mandible growth horizontally, the ramus tends to be taller (reduced gonial angle, transformed mandibular body to ramus ratio) -upper jaw tilts toward the the horizontal plane plane (forward growth, CCW rotation).
- Short ramus -> Vertical growth
- Taller ramus -> Horizontal growth