The widest transverse diameter of the fetal skull is :: (A) Biparietal diameter, (B) Occipito-frontal diameter, (C) Bitemporal diameter, (D) Suboccipito-frontal diameter
Answer is A. Transverse diameters of fetal skull in mechanism of labor are: Biparietal diameter: 9.5cm Super-subparietal: 8.5cm Bitemporal: 8cm Bimastoid: 7.5cm Reference: D C Dutta Textbook of Obstetrics 7th edition,page 85