Engaging diameter of face presentation | PGI Nov 2017 Preparations MCQ

NIME Next Batch PGI Quest in Delhi from 10 August to 20 August

Engaging diameter of face presentation 

A. Submentovertical 
B. Submentobregmatic 
C. Mentovertical 
D. Suboccipitofrontal
E. Any of the above

Ans.(A) Submentovertical ; (B) Submentobregmatic
• The engaging diameter of face presentation :
- Submentovertical (11.5 cm), when attitude of head is incomplete extension
- Submentobregmatic (9.5 cm), when attitude being complete extension.
• Engaging diameter
-Mentovertical (14cm) : in brow presentation
--- Sub-occipito frontal (10cm) : in vertex presentation