<prompt> Longest diameter of fetal skull?Suboccipito-bregmaticOccipto-ffontalMento-verticalSubmento vertical  <response>: Ans. is c i.e., Mento-vertical Diameters offetul skullAntero - posteriorDiameterMeasurement in cm inchesAttitude of the headPresentation1. Suboccipito-bregmatic - nape of the neck to centre of bregma9.5 cms3 34 Complete flexionVertex2. Suboccipitofrontal - nape of the neck to the anterior end of anterior fontanelle or centre of sinciput10 cms 4Incomplete flexionVertex3. Occipito-frontal - occipital eminence to the root of nose11.5 cms 4 12 Marked deflexionVertex4. Mento-vertical - mid point of the chin to highest point of sagittal suture14cms 5 12 Partial extensionBrow-5. Submento-vertical - junction of the floor of mouth neck to the highest point of sagittal suture11.5 cms 4 12 Incomplete extensionFace6. Submento bregmatic - junction of the floor of mouth neck to centre of bregma9.5 cms 3 34 Complete extensionFace 