Placed on the floor of the fossa
The outline is the easiest thing to see, so the point drifts down onto it. Sella is the center of the enclosed area, not a point on its edge.
Point · S
Sella (S)
The middle of a hole, not a point on a bone — which is why it is placed by eye and why almost everyone agrees about it.
At Beginner a placement counts as found within 2.1 mm of the reviewed reading.
How to find it
Press a step to be shown it on the ceph.
Common errors
Each figure is the reviewed reading of Sella (S) and a typical miss, on the same ceph, at the distance the mistake usually goes.
Pulled forward to the clinoid
The anterior clinoid is sharp and the fossa is not, and a sharp landmark attracts a point that belongs to a soft one.
Used in
13 measurements are built on it. Miss it, and every one of them moves.
- SNA angle
- SNB angle
- ANB angle
- Anterior cranial base length (S–N)
- Y-axis (S-Gn to FH)
- SN to mandibular plane (SN-GoGn)
- SN to occlusal plane
- Saddle angle (N-S-Ar)
- Articular angle (S-Ar-Go)
- Björk's sum of angles
- Anterior cranial base (N–S) — Jarabak
- Posterior cranial base (S–Ar) — Jarabak
- Posterior:anterior face height ratio (S-Go : N-Me)
Your record
You have not placed this one yet.