Which of the fontanelle is last to close?: (A) Posterior fontanelle, (B) Anterior fontanelle, (C) Mastoid fontanelle, (D) Sphenoidal fontanelle
Answer is B. Time of closure of different fontanelle: Posterior fontanelle- 2 to 3 months after bih Anterior fontanelle- 10-24 months after bih Mastoid fontanelle- 6- 18 months after bih Sphenoidal fontanelle- 6months after bih Ref: Nelson's 20th edition, page 2793