Mastoid fontanelle closes by: (A) 1-3 months, (B) 3-6 months, (C) 11-12 months, (D) 18-24 months
Answer is C. Closure of Fontanelles:1. Anterior fontanelle by 18 months2. Posterior fontanelle by 2-3 months3. Sphenoidal fontanelle by 2-3 months and 4. Mastoid fontanelle by 12 months Reference: Chourasia; 6th edition; 12th page