Red line showing the area of quadrilateral cartilage
Green lines showing the overlapping nasal tip cartilages
The area between the Anterior nasal spine and the anterior extent of nasal bones, shown by the grey vertical line, is a common fracture line through the septal cartilage, causing nasal obstruction.
Inferior and obliquely placed area of the nasal septum, shown by the oblique grey line, is a common site for fractures and spurs
The white line shows the septal cartilage and bone which can be safely harvested as a graft material.