Cephalometrics

Question 1

Porion

Answer 1

• Midpoint of the upper contour of external auditory canal (anatomic)
• Point midway between the top of the image of the left and right ear rods of the cephaloblast
  *

Question 2

Sella

Answer 2

• The center of the hypophyseal fossa
• A constructed point in the midsaggital plane

Question 3

Nasion

Answer 3

• Intersection of the internasal and frontonasal sutures in the midsagittal plane
• Midsagittal landmark

Question 4

Orbitale

Answer 4

• The lowest point on the inferior orbital margin
• Bilateral landmark

Question 5

Anterior Nasal Spine

Answer 5

• Most anterior point on maxilla at the nasal base

Question 6

Posterior Nasal Spine

Answer 6

• Tip of the posterior nasal spine of the palatine bone, at the junction of the soft and hard palate

Question 7

A point

Answer 7

Innermost curvature from the maxillary anterior nasal spine to the crest of the maxillary alveolar process

Location of A may change somewhat with root movement of Max incisor teeth

Marks the most anterior point of the maxillary apical base

Midsagittal

Question 8

B point

Answer 8

• Innermost curvature from chin to alveolar junction