basion

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English

Etymology

From New Latin, equivalent to basi- (“base”) +‎ -ion (“cephalometric reference point”).[1][2]

Noun

basion (plural basions)

  1. (anatomy) The middle of the anterior margin of the foramen magnum of the skull.
    • 1930, J. D. White, John Hugh McQuillen, George Jacob Ziegler, The Dental Cosmos - Volume 72, Part 1, page 646:
      In order to determine the distance of the zygomaxillare and the first molar from the basion (or prosthion), isosceles triangles were constructed from the measurements, which on one hand had the basion for the apex, the distance connecting both molar middle points as the base and the basion-first molar distance as the legs (Fig. 4. A), and on the other hand they had the distance between both zygomaxillaria as the base and the basion-zygomaxillaria as the base and the basion-zygomaxillary distance as the legs (Fig. 4. B).
    • 1980, York Archaeological Trust, The Archaeology of York, page 21:
      Additional skull measurements, taken with small sliding calipers, were from zygomaxillare, the lowest point on the zygomatic-maxillary suture, to the points of alveolare, basion and nasion.
    • 2010, John P. Dormans, Ejovi Ughwanogho, & Jaimo Ahn, "Pediatric Spine Trauma", Chapter 12 in Behrooz A. Akbarnia, Muharrem Yazici, & George H. Thompson (eds.) The Growing Spine: Management of Spinal Disorders in Young Children, page 138
      The tectorial membrane limits extension, while odontoid impaction on the basion limits flexion.

Derived terms

Translations

References

  1. ^ “basion, n.”, in OED Online Paid subscription required⁠, Oxford: Oxford University Press, launched 2000.
  2. ^ “basion, n.”, in Dictionary.com Unabridged, Dictionary.com, LLC, 1995–present.

Anagrams

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