diameter of fetal skull

diameter of fetal skull

Etymology: Gk, diametros + L, fetus + AS, skulle, bowl
the average distances between certain landmarks of the fetal skull as measured at term. These measurements include the following: biparietal, the fetal head between the two parietal eminences, 9.25 cm; occipitofrontal, from the external occipital protuberance to the most prominent point of the frontal midline, 11 cm; occipitomental, from the external occipital protuberance to the midpoint of the chin, 13 cm; and suboccipitobregmatic, from the lowest posterior point of the occipital bone to the center of the anterior fontanel, 9.5 cm.