Question:
The presenting diameter of a fully flexed fetal head is:
The presenting diameter of a fully flexed fetal head is:
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Full flexion presents the smallest, roughly 9.5 cm diameter.
Updated On: Jun 23, 2026
- Suboccipito-bregmatic diameter
- Suboccipito-frontal diameter
- Occipito-frontal diameter
- Occipito-posterior position
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The Correct Option is A
Solution and Explanation
Step 1: The presenting diameter of the fetal head depends on the degree of flexion. When the head is fully flexed (flexed vertex presentation), the smallest possible diameter presents to the pelvis.
Step 2: In a fully flexed head the engaging diameter is the suboccipito-bregmatic diameter, measured from the suboccipital region to the centre of the bregma. It measures about \(9.5\) cm and gives the smallest head circumference of roughly \(32\) cm.
Step 3: The suboccipito-frontal (\(10.5\) cm) presents with a partially deflexed vertex, the occipito-frontal (\(11.5\) cm) with a deflexed vertex, and occipito-posterior is a position rather than a diameter. Hence the fully flexed head presents with the suboccipito-bregmatic diameter.
Step 2: In a fully flexed head the engaging diameter is the suboccipito-bregmatic diameter, measured from the suboccipital region to the centre of the bregma. It measures about \(9.5\) cm and gives the smallest head circumference of roughly \(32\) cm.
Step 3: The suboccipito-frontal (\(10.5\) cm) presents with a partially deflexed vertex, the occipito-frontal (\(11.5\) cm) with a deflexed vertex, and occipito-posterior is a position rather than a diameter. Hence the fully flexed head presents with the suboccipito-bregmatic diameter.
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