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Nasion

nasion

The nasion is the most depressed point of the nasal root at the junction of the nasal bones and the frontal bone, corresponding to the nasofrontal suture. It is the deepest point of the curvature between the forehead and the nose. In rhinoplasty, the nasion defines the top of the nasal profile line and determines the degree of desired radix augmentation or reduction.

Region: Head & Skull

Clinical Relevance

Clinical Notes

The nasion is one of the four standard cephalometric landmarks (nasion, sella, articulare, menton) used in orthodontic and orthognathic surgery cephalometric analysis to assess skeletal facial relationships. In rhinoplasty, the radix level relative to the nasion determines the starting point of the nasal profile. Radix augmentation with filler or cartilage graft raises the nasion; radix reduction by rasping lowers it. The ideal nasion position is at the level of the upper eyelid supratarsal crease in the primary gaze.

Pathology

Common Injuries & Conditions

Nasofrontal Junction Fracture

High-velocity nasal trauma fractures the nasofrontal junction at the nasion, disrupting the nasofrontal suture and potentially injuring the frontal sinus floor; management requires CT to assess sinus involvement, with plating of the nasofrontal junction and sinus exploration if the posterior wall is fractured.