Mastoid fontanelle closes by
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
1-3 months
3-6 months
11-12 months
18-24 months
General anatomy