Fetal Skull Diameters, Diameter Of Skull Of Fetus at Time Of Delivery,

Fetal Skull Diameters

skull diameters of the fetus

Occipito-mental diameter = 13cm

Occipito-mental diameter is the largest diameter if the baby is presented in this position it often requires surgical interventions. Such presentation is also known as brow presentation.

Submento-bregmatic diameter = 9.5cm

This diameter is presented in face presentation of the baby, it means face is the first thing which is visible through the vagina during delivery. Normally vertex area of the fetal head is the first thing which is seen.

Vertex presentation diameters:
Occipito-frontal diameter = 11.5cm
This is the diameter which is presented in the less flexed head, (vertex presentation)

Suboccipitobregmatic diameter = 9.5cm
This is the diameter which is presented in the well-flexed head, and in normal delivery. (vertex presentation)

The anteroposterior diameter of the pelvic outlet is 13.5 cm in the normal pelvis

The anteroposterior diameter of the pelvic inlet in 11.0 cm in normal pelvic
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