Orbitale
Pronunciation: or-BIT-ah-lay
The most inferior point on the lower margin of the bony orbit, serving as one of the two reference points defining the Frankfort Horizontal Plane.
Full Definition
Orbitale (abbreviated Or) is a bilateral cephalometric landmark located at the lowest point of the inferior orbital rim. Together with Porion, it defines the Frankfort Horizontal Plane, a standard reference line used extensively in cephalometric and surgical planning documents. When used in lateral cephalograms, the midpoint between the left and right Orbitale is typically used. Editors encountering measurements referenced to the Frankfort plane should understand that Orbitale is an essential component of that construction. The term is often misspelled as 'orbitale' without capitalisation in contexts where it should be treated as a proper landmark name.
Usage
Usage note: Capitalise as a cephalometric landmark. Do not confuse with the general anatomical term 'orbital rim' or with Porion, the other point defining the Frankfort Horizontal Plane.
In Context
- "The Frankfort Horizontal Plane was constructed by connecting Porion to Orbitale on the lateral cephalogram." — Cephalometric analysis report
- "Orbitale was clearly visible on the radiograph, allowing accurate plane construction." — Orthodontic case documentation