Question

Presenting diameter of full flexed head:

• A. Suboccipito-bregmatic diameter
• B. Suboccipito-frontal diameter
• C. Occipito-frontal diameter
• D. Occipito-posterior position

Answer 1

The Correct Option is A

The diameter of a fully flexed head during childbirth refers to the measurement crucial for understanding the head's passage through the birth canal. In a fully flexed position, the smallest anteroposterior diameter is engaged, which is the suboccipito-bregmatic diameter. This measurement extends from the base of the occipital bone (just above the neck) to the center of the bregma (anterior fontanelle of the skull). It is approximately 9.5 cm in length and is the optimal diameter for vaginal delivery, as it presents the smallest circumference through the birth canal, reducing the risk of complications during labor. Therefore, when considering the diameters mentioned, the suboccipito-bregmatic diameter is correct for a fully flexed head.