Author: Glossary
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Occipitomental diameter
The greatest distance between the most prominent portion of the occiput and the point of the chin (about 13.5 cm).
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Occipitofrontal diameter
The distance from the posterior fontanel to the root of the nose.
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Obstetrical diameter of pelvic inlet
The shortest distance between the sacrum and the symphysis pubis. This diameter is shorter than the true conjugate.
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Mesiodistal diameter
The measurement of a tooth from the ventral or mesial surface to the distal or dorsal surface.
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Mentobregmatic diameter
The distance from the chin to the middle of the anterior fontanel.
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Labiolingual diameter
The measurement of an anterior tooth from the labial to the Ungual surface.
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Intertuberous diameter
The distance between the ischial tuberosities. Most commonly, this measure of the female pelvic outlet is greater than 9 cm, allowing the exit of an average-sized term fetus.
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Interspinous diameter
The distance between the two anterior superior spines of the ilia.
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Frontomental diameter
The distance from the top of the forehead to the point of the chin.
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External conjugate diameter
The anteroposterior diameter of the pelvic inlet measured externally; the distance from the skin over the upper part of the symphysis pubis to the skin over a point corresponding to the sacral promontory.