Cephalometric Points

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Author:
adamsnyder
ID:
92712
Filename:
Cephalometric Points
Updated:
2011-12-17 16:23:56
Tags:
ortho
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Description:
ceph definitions
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  1. Point A
    the innermost point on the contour of the premaxilla between anterior nasal spine and the incisor tooth
  2. ANS (anterior nasal spine)
    the tip of the anterior nasal spine

    - sometimes modified as the point on the upper or lower contour of the spine where it is 3 mm thick
  3. Point B
    the innermost point on the contour of the mandible between the incisor tooth and the bony chin
  4. Ba (basion)
    the lowest point on the anterior margin of foramen magnum, at the base of the clivus
  5. Gn (gnathion)
    the center of the inferior point on the mandibular symphysis

    (i.e. the bottom of the chin)
  6. Na (nasion)
    the anterior point of the intersection between the nasal and frontal bones
  7. PNS (posterior nasal spine)
    the tip of the posterior spine of the palatine bone, at the junction of the hard and soft palates
  8. Bo (Bolton point)
    the highest point in the upward curvature of the retrocondylar fossa of the occipital bone
  9. Ar (articular)
    the point of intersection between the shadow of the zygomatic arch and the posterior border of the ramus
  10. Po (porion)
    the midpoint of the upper contour of the external auditory canal (anatomic porion)

    the midpoint of the upper contour of the metal ear rod of the cephalometer (machine porion)
  11. SO (sphenoccipital synchondrosis)
    the junction between the occipital and basisphenoid bones (if wide, the upper margin)
  12. S (sella)
    the midpoint of the cavity of sella turcica
  13. Ptm (pterygomaxillary fissure)
    the point at the base of the fissure where the anterior and posterior walls meet
  14. Or (orbitale)
    the lowest point on the inferior margin of the orbit
  15. Pog (pogonion)
    the most anterior point on the chin
  16. Me (menton)
    the most inferior point on the mandibular symphysis (i.e. the bottom of the chin)
  17. Go (gonion)
    the midpoint of the contour connecting the ramus and body of the mandible

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