Engaging diameter of face presentation | PGI MCQ for Medical PG Coaching & Preparations .. NIME

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